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1

Parker, Michael Charles. "Dynamic holograms for wavelength division multiplexing." Thesis, University of Cambridge, 1997. https://www.repository.cam.ac.uk/handle/1810/251616.

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2

Ahmadvand, Nima. "Wavelength division multiplexing cross connect networks." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ30066.pdf.

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3

Srinivas, B. S. "Wavelength division multiplexing technology and systems /." This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-03042009-040832/.

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4

Srinivas, Bindignavile S. "Wavelength division multiplexing technology and systems." Thesis, Virginia Tech, 1990. http://hdl.handle.net/10919/41416.

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5

Cowin, Michael. "Integrated polymeric components for wavelength division multiplexing." Thesis, University of Bristol, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364964.

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6

Tohme, Henri Edouard. "Dual channel bidirectional wavelength division multiplexing datalink." Thesis, Virginia Tech, 1988. http://hdl.handle.net/10919/43061.

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Wavelength division multiplexing two channels on one fiber is one approach that enables us to make use of the extremely large bandwidth of optical fibers. We start with an analysis of optical fibers, sources, detectors, filters and wavelength division ,multiplexers. Then, using the knowledge from the experimental data, we design a 20 km bidirectional WDM datalink. The design is backed up with theory and measurements. Fiber to the home is one of many applications that makes use of such a design.
Master of Science
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7

OLIVIERI, BRUNO SAPHA. "INTERROGATION SYSTEM OF FIBER BRAGG GRATING SENSORS USING TIME DIVISION MULTIPLEXING AND WAVELENGTH DIVISION MULTIPLEXING." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2004. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=5905@1.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
Um sistema de interrogação de sensores a rede de Bragg utilizando multiplexação no tempo e multiplexação no comprimento de onda é proposto e demonstrado. O sistema apresenta uma solução para a medição de grandezas associadas ao espectro de reflexão de redes de Bragg, possibilitando o aumento do número de sensores a rede de Bragg monitorados através de grandes distâncias em uma mesma fibra óptica, sem um aumento significativo dos custos. O aspecto inovador deste sistema reside na particular associação das seguintes características: o uso de fonte pulsada de banda larga, a disposição, em série, de um grande número de sensores a rede de Bragg de baixa refletividade, a técnica de reutilização dos mesmos comprimentos de onda nominais em grupos contendo vários sensores com comprimentos de onda nominais distintos e um processo de filtragem espectral e análise de sinais pulsados utilizando o filtro DWDM comercial. Aspectos teóricos e experimentais considerando os princípios de trabalho desta técnica são discutidos. Comparações entre resultados simulados e experimentais do sistema implantado mostram boa concordância. Resultados experimentais apontam uma faixa dinâmica de 1,7 nm, podendo encontrar aplicações em medição de temperatura com uma faixa de 150°C. Incertezas com valores médios abaixo de 20 picometros foram obtidas. Simulações experimentais apontam a possibilidade de utilização de um número de aproximadamente 70 sensores com 0,4% de refletividade, por comprimento de onda. Considerando a largura de banda do dispositivo DWDM (1539- 1565 nm) utilizado neste sistema, e um espaçamento de 7 nm por comprimento de onda nominal de sensor, extrapolações mostram que este número pode chegar a 210 sensores em três diferentes comprimentos de onda nominais de sensor. Considerando as bandas C e L este número pode chegar a aproximadamente 1000 sensores em 14 diferentes comprimentos de onda nominais de sensor.
An interrogation system of fiber Bragg grating sensors using time division multiplexing and wavelength division multiplexing is proposed and demonstrated. The system presents a solution to measure the magnitudes associated to the reflection spectrum of the fiber Bragg gratings, making possible to increase the number of the Bragg gratings sensors monitored through large distances at the same fiber optic, without a great increase in the costs. The innovative aspect of this system is the particular association of the following characteristics: the use of a pulsed broad band source, the disposition, in series, of a large number of low reflectivity Bragg gratings sensors, the reusing technique of the same nominal wavelengths in groups containing several numbers of sensors with distinct nominal wavelengths, and a spectral analyzing and filtering process of pulsed signals using a commercial DWDM filter. Theoretical and experimental aspects regarding the working principles of this technique are discussed. Comparisons between experimental and simulated results show a good agreement. Experimental results indicate that a dynamic range of 1,7 nm was obtained. It can be used in temperature measurement systems, with a 150°C range. Uncertainties equivalent to approximately 20 picometers was obtained. Experimental simulations indicate that it would be possible to use a number of approximately 70 sensors with 0,4% reflectivity at each nominal sensor wavelength. Considering the DWDM filter bandwidth (1539-1565 nm) used in this system, and a spectral separation of 7 nm by nominal sensor wavelength, extrapolations indicate that a number of 210 sensors can be obtained, in three different nominal sensor wavelength. Using the C-band and the L-band, a number of 1000 sensors can be obtained, in fourteen different nominal sensor wavelength.
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8

Buyuksahin, Oncel F. Feza. "Modulation Formats For Wavelength Division Multiplexing (wdm) Systems." Phd thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12611039/index.pdf.

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Optical communication networks are becoming the backbone of both national and international telecommunication networks. With the progress of optical communication systems, and the constraints brought by WDM transmissions and increased bit rates, new ways to convert the binary data signal on the optical carrier have been proposed. There are different factors that should be considered for the right choice of modulation format, such as information spectral density (ISD), power margin, and tolerance against group-velocity dispersion (GVD) and against fiber nonlinear effects like self-phase modulation (SPM), cross-phase modulation (XPM), four-wave mixing (FWM), and stimulated Raman scattering (SRS). In this dissertation, the several very important modulation formats such as Non Return to Zero (NRZ), Return to Zero (RZ), Chirped Return to Zero (CRZ), Carrier Suppressed Return to Zero (CSRZ), Differential Phase Shift Keying (PSK) and Carrier Suppressed Return to Zero- Differential Phase Shift Keying (CSRZ-DPSK) will be detailed and compared. In order to make performance analysis of such modulation formats, the simulation will be done by using VPItransmissionMakerTM WDM software.
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9

Lepley, Jason J. "Frequency stabilisation for dense wavelength division multiplexing systems." Thesis, University of Essex, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310059.

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10

Qiao, Jie. "Dense wavelength division multiplexing (DWDM) for optical networks." Access restricted to users with UT Austin EID, 2001. http://wwwlib.umi.com/cr/utexas/fullcit?p3035169.

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11

Deng, Xuegong. "High performance wavelength-division multiplexing schemes for optical networks." Access restricted to users with UT Austin EID Full text (PDF) from UMI/Dissertation Abstracts International, 2001. http://wwwlib.umi.com/cr/utexas/fullcit?p3031039.

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12

Khattab, Tamer. "Optical Code Division Multiplexing for sub-wavelength switching systems." Thesis, University of British Columbia, 2007. http://hdl.handle.net/2429/31083.

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Optical Code Division Multiplexing (OCDMA) is a method used to enable simultaneous transmission of multiple optical data flows over the same fiber using the same wavelength. In OCDMA, isolation between different data flows is achieved using a set of uncorrelated, or loosely correlated, spreading codes to encode the transmitted signal and decode it at the receiver side. The process of encoding and decoding is performed entirely in the optical domain without the need for optical-to-electrical-to-optical conversion. This increases the granularity of traffic isolation in the optical domain while maintaining higher speed switching because of the all-optical encoding/decoding capability. Although code division multiplexing is a well established technique in wireless transmission where all processing of data and switching are performed electronically, there are many challenges in applying this scheme in the optical domain mainly due to the different characteristics of the medium and the fact that negative-valued signals are not easy to produce. This thesis has three main objectives: to deploy OCDMA as a switching mechanism at the sub-wavelength level in order to increase the granularity of traffic isolation in all-optical core switching, to design new mechanisms that enhance the performance of OCDMA as a multiplexing method over long-haul optical fiber transmissions, and to model the performance of OCDMA based switching and multiplexing mechanisms. All-optical switching at the core of the network provides very high speed switching. However, it suffers from low utilization or lack of quality of service guarantees due to lack of fine granularity traffic isolation. This thesis presents an optical network architecture called Optical Code Labeled Generalized Multi-Protocol Label Switching (OC-GMPLS), which utilizes OCDMA as a switching mechanism in backbone GMPLS networks. OC-GMPLS uses OCDMA as an all-optical labeling space in GMPLS switching in order to achieve finer granularity switching at the all-optical network core. The deployment of OC-GMPLS networks mandates performance modeling to show its advantages and to enable tuning of the new network parameters so that performance can be optimized. In this thesis we present an analytical model for the throughput and switching capacity of OC-GMPLS networks. Using our model, we show how to find optimal operating points for OC-GMPLS networks based on physical layer and network layer parameters. The performance of OC-GMPLS networks depends on the performance of OCDMA transmission, which is affected by the modulation method and the optical spreading codes properties. In order to enhance the performance of OC-GMPLS networks, we take two different approaches. The first approach is based on proposing a modulation mechanism that enhances the communication reliability while maintaining low bit error rate for OCDMA transmissions. Our Chip-Level Modulated Binary Pulse Position Modulation (CLM-BPPM) scheme provides a simple to implement (in the all-optical domain) yet a very powerful physical layer method for sending multiple optical flows using OCDMA while maintaining the Bit Error Rate (BER) due to Multiple Access Interference (MAI) effects between these flows at a low level of about 10⁻¹² for 10 simultaneous users. Our method provides a better capability in terms of clock recovery and user activity detection while achieving error rates in the range of those provided by On-Off Keying (OOK). Performance of OCDMA transmission depends to a great extent on the efficiency of the codes used to perform the multiplexing. In order to tackle this side, we investigate the problem of Optical Orthogonal Code (OOC) design by proposing a method called Rejected Delays Reuse (RDR) for constructing OOCs using an element-by-element based greedy algorithm. We show that our method provides a computationally less complex algorithm for designing OOCs, which makes it more practical. Our analysis and simulation results show that OOCs designed using the RDR greedy method are also higher in multiplexing efficiency than OOCs designed using classical element-by-element constructions. This is because RDR designed OOCs possesses smaller code lengths for the same code cardinality and weight than their counterpart classical element-by-element greedy designed codes.
Applied Science, Faculty of
Electrical and Computer Engineering, Department of
Graduate
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13

Paiam, Mohammad Reza. "Applications of multimode interference couplers in wavelength-division multiplexing." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq23053.pdf.

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14

Provost, Lionel Andre. "Simultaneous all-optical processing of wavelength division multiplexing channels." Thesis, University of Southampton, 2012. https://eprints.soton.ac.uk/210988/.

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In this thesis, the possibility of simultaneous all-optical regeneration of wavelengthdivision multiplexed (WDM) signals within the same optical device is investigated. The optical regeneration scheme discussed in this thesis relies on the exploitation of the SPM induced by the optical Kerr nonlinearity within an optical fibre. In the work presented in this thesis, I report the extension of a particular single-channel all-optical 2R regenerator suitable for on-off keying return-to-zero modulation format to WDM operation. The device is referred to as the Mamyshev regenerator, and provides both Re-amplification and Re-shaping capabilities for the incoming optical signal. An in-depth analysis of the single-channel device reveals that remarkable and simple scaling rules can be established to relate the output properties of the optical regenerate to the characteristics of the incoming signal to be regenerated and key physical parameters defining the optical regenerator. The analysis allows general conclusions to be drawn on the mitigation strategies to be implemented to extend the scheme to the multi-channel case. The extension to the multi-channel scenario is then examined. Minimization of the interaction time between adjacent channels is introduced by inducing a sufficient walkoff between co-propagating signals. The strength of the inter-channel nonlinearities can be sufficiently reduced to preserve the optical regeneration capabilities. Two techniques are therefore reported. One is based on the counter-propagation of two optical signals within the same piece of nonlinear fibre. The second relies on polarization multiplexing of two co-propagating signals. Theoretical aspects and experimental demonstrations at 10 Gb/s, 40 Gb/s, and 130 Gb/s are reported
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15

Luo, Xubin. "Wavelength Division Multiplexing Optical Networks for Supporting Grid Computing." Wright State University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=wright1221753325.

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16

Chu, Xiaowen. "RWA and wavelength conversion in wavelength-routed all-optical WDM networks /." View Abstract or Full-Text, 2003. http://library.ust.hk/cgi/db/thesis.pl?COMP%202003%20CHU.

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Thesis (Ph. D.)--Hong Kong University of Science and Technology, 2003.
Includes bibliographical references (leaves 127-134). Also available in electronic version. Access restricted to campus users.
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17

Leith, Christopher. "Analytical models for all-optical networks employing wavelength division multiplexing and wavelength conversion." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0002/MQ42649.pdf.

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18

Wei, Shi. "Silicon photonic filters for wavelength-division multiplexing and sensing applications." Thesis, University of British Columbia, 2012. http://hdl.handle.net/2429/43116.

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This thesis is a theoretical and experimental study of novel silicon photonic filters, such as traveling-wave resonators (TWRs) and grating-assisted, contra-directional couplers (contra-DCs), for on-chip wavelength-division-multiplexing (WDM) systems and sensing applications. To measure optical losses of photonic components such as Y-branch splitters and waveguide crossings, we have developed a ring-resonator based technique which is accurate, simple, and space-efficient. A number of novel devices have been demonstrated using commercial CMOS-photonics fabrication foundries, with the aim of developing large-scale photonic integrated circuits using the standard process development tools. Two types of wavelength-selective, TWR-based reflective filters have been demonstrated for applications such as remote sensing and tunable lasers. Ultra-compact, high-Q microdisk resonators have been demonstrated, with radii of down to 1.5 µm, free spectral ranges (FSRs) of up to 71 nm, loaded Q's of up to 88,000, and unloaded Q's of over 100,000. Contra-DCs have been studied using coupled-mode theory. An add-drop filter designed using contra-DCs in slab-modulated rib waveguides has been proposed and demonstrated, which shows a flat-top response and a narrow bandwidth of 50--100 GHz, promising for dense-WDM applications. Also, we proposed an out-of-phase grating design to suppress the intra-waveguide reflection in contra-DCs. Using this novel anti-reflection (AR) design, we have demonstrated an add-drop filter with a single-band, flat-top response and a wide channel bandwidth of 6.5 nm, which enables athermal operation in a large temperature span of > 70 K. This AR contra-DC can be used to build an on-chip coarse-WDM system for power-efficient, ultra-high-speed optical interconnects. Furthermore, we have proposed and demonstrated an electrically tunable phase-shifted contra-DC. In order to overcome the challenges facing microring resonators, such as limited FSRs and difficulty in controlling the bus-resonator coupling, we have proposed to integrate contra-DCs with microring resonators for selective bus-resonator coupling. Using this method, we have demonstrated a single dominant resonant mode in a microring resonator that originally has a small FSR of 1.3 nm. This grating-coupled microring resonator is promising for applications that need a huge free spectral range, such as cascaded resonator sensor arrays and ultra-high-bandwidth WDM systems.
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19

Rothnie, Derek Malcolm. "Link optimisation for optical WDM transmission systems." Thesis, University College London (University of London), 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.298281.

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20

Cen, Min. "Study on Supervision of Wavelength Division Multiplexing Passive Optical Network systems." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-42362.

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The wavelength-division-multiplexed passive optical network (WDM-PON) offers many advantages such as large bandwidth per user, easy management, high network security and low insertion loss enabling long-reach and/or high split-ratio. However, with the rapid development and growing interest for deployment of WDM-PON, the PON systems are becoming increasingly vulnerable to various failures. Therefore, network supervision becomes extremely important to guarantee an appropriate level of network reliability performance. The aim of PON supervision is to provide automated test and diagnostic capability without compromising the available bandwidth for services. An essential function is to detect any kind of deterioration in the network that can cause suspended services and to remotely localize these faults in order to avoid the high cost arising from troubleshooting. In this thesis, we evaluate several existing WDM PON supervision methods, based on which two simple and cost-effective new solutions are proposed to localize fiber failures in WDM PON systems. In the first solution, a conventional optical time domain reflectometry (OTDR) and a switch unit are employed, while in the second method, a novel architecture based on N×N arrayed waveguide grating (AWG) is proposed. Both methods are able to localize failures in feeder fiber and drop fibers without e.g. using expensive tunable OTDRs. A patent has been filed based on the second solution. The first proposed method is validated by simulations using VPI Transmission Maker. According to the results, this supervision method is able to give accurate measurement of many different types of failures that may happen in a fiber link. Furthermore, VPI is examined in terms of its future applicability in modeling complete PON supervision methods based on OTDR.
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21

Boeck, Robert. "High performance silicon photonic filters for dense wavelength-division multiplexing applications." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/57688.

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This dissertation presents theoretical and experimental results for silicon optical ring resonator filters that meet many of the typical commercial specifications for dense wavelength-division multiplexing (DWDM) filters. First, we theoretically demonstrate a silicon quadruple Vernier racetrack resonator that meets 4-port filter commercial specifications for a clear window of 0.08 nm and a channel spacing of 0.8 nm while being tolerant to typical fabrication variations. Next, we experimentally demonstrate a silicon quadruple Vernier racetrack resonator that meets many 3-port filter commercial specifications for a clear window of 0.048 nm and a channel spacing of 0.8 nm. Then, enhanced resonant tuning range using the Vernier effect is theoretically and experimentally demonstrated using a thermally tunable silicon quadruple Vernier racetrack resonator. Also, we sent 12.5 Gbps data through a thermally tunable silicon quadruple Vernier racetrack resonator and show open eye diagrams in both the drop port and through port of the filter, even within one of the minor through port notches. We then present theoretical and experimental results on a high performance silicon double microring resonator filter using Mach-Zhender interferometer-based coupling that meets numerous 3-port filter commercial specifications for a clear window of 8 GHz and a channel spacing of 200 GHz as well as having an FSR larger than the span of the C-band and low through port passband dispersion. Next, we present a FSR-eliminated silicon Vernier racetrack resonator filter. We demonstrate the performance of this filter both theoretically and experimentally. The FSR of this filter is eliminated by using contra-directional grating couplers (contra-DCs) to suppress all but one of the notches and peaks of the filter's spectra. Lastly, a process calibration procedure is demonstrated that accurately determines the coupling coefficients of fabricated contra-DCs and is used to design a FSR-eliminated silicon Vernier racetrack resonator filter that meets 3-port filter commercial specifications for a clear window of 13 GHz and a channel spacing of 200 GHz. This filter also has low drop port dispersion and low dispersion within the passbands of the through port.
Applied Science, Faculty of
Electrical and Computer Engineering, Department of
Graduate
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22

Fay, Martin Freestone. "True 2D wavelength division multiplexing, binary superimposed gratings and their applications." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0001/MQ34131.pdf.

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23

Thomas-Dupuis, Frédéric. "Investigation of two-dimensional optical formatting for dense wavelength division multiplexing." Thesis, McGill University, 2002. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=79265.

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Many multi-channel free-space micro-optical components such as micro-mirror switches and (tunable) vertical-cavity surface emitting lasers (VCSELs) are arranged in two-dimensional arrays. This thesis explores the design, implementation and characterization of a two-dimensional optical wavelength (de)multiplexer designed to interface between wavelength division multiplexing (WDM) optical networks and 2D micro-mirror optical switch, VCSEL or detector arrays. The system uses multifacet gratings to map the light from a traditional optical (de)multiplexer to a 4 x 16 array with a pitch of 250 mum. The device is 6.05 mm in length and could be fabricated by plastic injection molding. The device successfully performs the two-dimensional mapping. The average efficiency for the device was measured to be 10.4%. The thesis ends with a list of future work that can be done to improve both the theoretical and practical efficiency of the device.
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24

Dods, Sarah D. "Homodyne crosstalk in wavelength-division multiplexed ring and cus networks /." Connect to thesis, 2000. http://eprints.unimelb.edu.au/archive/00000597.

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25

Handley, Michael Robert. "Dynamic wavelength assignment in WDM passive optical networks." Thesis, Manchester Metropolitan University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367729.

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This thesis is concerned with the study of dynamic wavelength assignment in wavelength division multiplexed (WDM) passive optical networks (PONs), which is one option for implementing WDM in access networks. A discrete event simulation is developed using the Block Oriented Network Simulator (BONeS) package to compare a WDM PON using dynamic wavelength allocation with one utilizing fixed wavelengths. The model is used in conjunction with a traffic profile constructed using market research data to show bandwidth savings for dynamic assignment of between 4 and 20 % depending on the number of customers and the services distributed. It is shown that the alternative approach of using the Erlang laws underestimates these benefits. An upstream protocol for real-time services with a Fibre To The Cabinet (FTTCab) configuration is developed for single wavelength PONs. It is shown that using connectionbased information does not improve the performance of such a protocol. A segment based protocol which provides timing information on cell arrivals to reduce CDV is modelled and optimized. The results show that a frame of 766 ps divided into 10 segments allows the International Telecommunication Union (ITU) delay and cell delay variation (CDV) targets to be met. The protocol and modelling process is then extended to a WDM system with multiple service classes and non-negligible tuning times. A mechanism for masking tuning latencies which achieves a throughput efficiency of over 98% is designed and modeled. An improvement in performance is then demonstrated for rapid retuning at frame level compared with wavelength assignment at connection set-up. Finally, a new architecture for transferring the tunable devices from the optical network units (ONUs) to the optical line termination (OLT) is proposed. The reduction in the number of tunable components enables cost savings. The efficient transmission of broadcast and multicast traffic is demonstrated using this architecture.
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Taveira, Palmerston Donizzeti. "Caracterização e análise de desempenho dos amplificadores ópticos Raman discretos em sistemas de comunicações ópticas na banda O." Universidade Presbiteriana Mackenzie, 2006. http://tede.mackenzie.br/jspui/handle/tede/1414.

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Made available in DSpace on 2016-03-15T19:37:40Z (GMT). No. of bitstreams: 1 Palmerston Donizzeti Taveira.pdf: 3709250 bytes, checksum: f7776004371e059d73f0d20c8d735c07 (MD5) Previous issue date: 2006-08-02
The optical amplifier has improved the optical communication systems because they lead to an increase in transmission capacity of medium and long haul optical systems, with technological advantages over electronic regenerators. The optical amplifier are relatively simple to deploy and can be used in optical links without any troubles regarding signal transmission rate improvement and signal modulation changes, as a consequence of these issues they can substitute the electronic regenerator enhancing security with low operation cost. The CWDM systems multiplex optical wavelength with a low cost in metropolitan networks. It was developed to connect backbone networks to metro core and edge networks with cost saving over DWDM systems but lower transmission capacity. We have developed and characterized in our research a discrete Raman amplifier for operation in O band. We connected the amplifier in a point to point CWDM in order to analyze the gain on the system transmission capacity and the impairments that appears in the system. Working with a eight channel CWDM in O band, modulated with 2.5 Gbit/s, we have demonstrated that we can use a discrete Raman amplifier in single configurations, pre amplifier, booster and line amplifier and shared configuration with booster and pre amplifier to increase the transmission capacity that means, increase the length of the optical link. We have increased in 110% the length of the optical link with a shared configuration of two amplifiers with 10 dB gain for each one.
Os amplificadores ópticos revolucionaram a tecnológica das comunicações ópticas, pois possibilitaram o aumento da capacidade de transmissão dos sistemas ópticos de média e longa distância, com vantagens tecnológicas sobre os regeneradores. Estes dispositivos são relativamente simples de serem desenvolvidos, utilizam poucos componentes e podem ser utilizados nas redes ópticas de forma transparente a taxa de transmissão e modulação do sinal. Substituem assim, com vantagens, os regeneradores eletrônicos, agregando segurança e baixo custo à operação das redes ópticas. Os sistemas CWDM realizam a multiplexação óptica de comprimentos de onda a um baixo custo em redes metropolitanas. São utilizados para conectar as redes de transporte de alta capacidade às redes de acesso, trazendo uma larga vantagem em custo sobre os sistemas DWDM, porém com menor capacidade de transmissão. Nosso trabalho de pesquisa consistiu em desenvolver e caracterizar um amplificador Raman discreto na banda O (1260 a 1360 nm), aplicando este amplificador em um sistema CWDM ponto a ponto com taxa de transmissão de 2.5 Gbit/s por canal e analisando o aumento na capacidade de transmissão e os efeitos que degradam o sinal transmitido. Trabalhando com um sistema CWDM com oito canais na banda O, demonstramos que podemos utilizar um amplificador Raman discreto nas configurações isoladas de pré-amplificador, booster e amplificador de linha e na configuração simultânea de booster e pré-amplificador para aumentar a capacidade de transmissão. Aumentamos o comprimento original do enlace em 110%.
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27

Akanbi, Oladeji Bamidele. "Bi-directional Dense Wavelength Division Multiplexed Systems for Broadband Access Networks." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/13964.

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Dense wavelength division multiplexing (DWDM) is becoming the technology of choice for meeting the increasing bandwidth demands in optical networks. DWDM has been used to increase the capacity of long-haul optical transport systems. Efforts are being made to move DWDM into the broadband access network serving residential and business subscribers. First, a new centralized DWDM PON scheme is demonstrated for bi-directional upstream and downstream transmissions. The proposed DWDM PON scheme is implemented using optical carrier suppression and separation (OCSS) technology to generate a wavelength pair from a single laser source at the central office. This method enables the co-location of both upstream and downstream DWDM transmitters in the central office. In addition, the complexity, cost, and maintenance of the optical network unit are reduced by enabling wavelength independent operation. Second, a new multistage architecture is proposed for the delivery of information to groups of subscribers located at different distances from the central office. A 25 GHz DWDM comb is generated using OCSS technology, and error-free transmission of four 10 Gbps channels is demonstrated. Finally, a new wide area access network with bi-directional DWDM amplification using semiconductor optical amplifiers (SOAs) is demonstrated. The detrimental effect of SOA crosstalk resulting from cross gain modulation can be suppressed using a constant intensity modulation format such as differential phase shift keying (DPSK). The feasibiity of bi-directional DPSK transmission of 16 interleaved DWDM channels using an in-line SOA has been studied experimentally. In addition, the reduction of bi-directional SOA reflections has been realized by optimizing the SOA bias current and facet reflectivities.
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28

GETANEH, WORKALEMAHU AGEREKIBRE. "Optical Time Domain Reflectometer based Wavelength Division Multiplexing Passive Optical Network Monitoring." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-105149.

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This project focuses on wavelength division multiplexing passive optical network (WDM-PON) supervision using optical time domain reflectometer (OTDR) for detection and localization of any fault occurred in optical distribution network. The objective is to investigate the impact of OTDR monitoring signal on the data transmission in the WDM-PON based on wavelength re-use system, where the same wavelength is assigned for both upstream and downstream to each end user. Experimental validation has been carried out to measure three different schemes, i.e. back-to-back, WDM-PON with and without OTDR connection by using 1xN and NxN arrayed waveguide gratings. Furthermore, a comprehensive comparison has been made to trace out the effect of the monitoring signal which is transmitted together with the data through the implemented setup. Finally, the result has confirmed that the OTDR supervision signal does not affect the data transmission. The experiment has been carried out at Ericsson AB, Kista.
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29

Orazi, Richard Joseph. "Fabrication and characterization of narrow channel fused fiber wavelength division multiplexing couplers." Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2007. http://wwwlib.umi.com/cr/ucsd/fullcit?p3278315.

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Thesis (Ph. D.)--University of California, San Diego, 2007.
Title from first page of PDF file (viewed November 7, 2007). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references.
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30

Harris, Mitchell T. "Analysis of semiconductor optical amplifiers in VCSEL based wavelength division multiplexing communication /." abstract and full text PDF (free order & download UNR users only), 2007. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1446799.

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Thesis (M.S.)--University of Nevada, Reno, 2007.
"May, 2007." Includes bibliographical references (leaves 82-83). Online version available on the World Wide Web. Library also has microfilm. Ann Arbor, Mich. : ProQuest Information and Learning Company, [2007]. 1 microfilm reel ; 35 mm.
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31

Riziotis, Christos. "Advanced Bragg grating based integrated optical devices for wavelength division multiplexing systems." Thesis, University of Southampton, 2002. https://eprints.soton.ac.uk/15489/.

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This thesis presents experimental and theoretical work towards the development of advanced integrated planar optical devices for wavelength division multiplexing (WDM) applications in optical communication systems. The presented work lies within a broad range of research areas, namely: design and simulation of novel Bragg grating based WDM passive devices, their performance characterization in simulated optical communication systems, fabrication and characterization of photosensitive thin films and finally device fabrication using ultraviolet induced refractive index changes. A complete model for the analysis of Bragg grating assisted devices in waveguide structures has been developed. Bragg grating based optical Add/Drop multiplexers (OADM) have been simulated and studied by using this modelling tool. A fully optimised design for an OADM based on null coupler and tilted Bragg grating has been proposed. This device can exhibit optimised Add and Drop actions with suppressed backreflections and crosstalk to a level lower than -40 dB. A novel interferometric OADM configuration based on a full cycle full (100%) coupler is also proposed. This design exhibits fully optimised and symmetrical Add/Drop actions in contrast to the compromised performance of traditional interferometric configurations. A software simulation tool has also been developed and employed for the theoretical characterization of optical filters, linking this way the proposed devices to real communication system issues related to high bit rate WDM networks. The effect of group delay ripple in WDM filters is studied for different modulation formats and a simplified figure of merit is proposed for the characterization of the effect. For the fabrication of photosensitive thin film structures, a prototype in-house Flame Hydrolysis Deposition facility was built and it was initially characterized. Further experimental work involved detailed analysis and characterization of highly photosensitive Lead Germanate glasses grown by Pulsed Laser Deposition. A developed direct UV-writing facility is presented and major issues around the functionality of the technique are discussed, by demonstrating solutions for the control of the optical system. A rapid heat treatment technique is also proposed for locking the enhanced photosensitivity in deuterium loaded germanosilicate glasses and successful preliminary results are demonstrated. This method should allow finally the fabrication of complex all-UV-written devices, which has been limited to date by the degrading photosensitivity during UV writing, due to rapid deuterium outdiffusion.
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32

Malaeb, Maadad Assaad 1963. "Noise and jitter analysis for wavelength division multiplexing optical heterodyne PSK receivers." Thesis, The University of Arizona, 1992. http://hdl.handle.net/10150/278132.

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Performance analysis of optical heterodyne receivers in Wavelength Division Multiplexing (WDM) has been an important research area in the last few years. WDM can potentially provide hundreds of Gb/s channels in the same fiber. However, because of channel interference in WDM, performance analysis is important to design the system properly. In this thesis, a detailed noise and jitter analysis has been performed for an optical heterodyne PSK receiver used in WDM. In WDM, noise sources include shot noise, channel interference noise, and phase noise. These noise sources will not only add to the signal, but also cause timing jitter at the bit timing recovery. Expressions for the noise and jitter variances at the detector input are derived for both RZ and NRZ signals. Bit error probabilities as a function of WDM channel separation are computed. It is found that the overall bit error rate performance of RZ is better than NRZ.
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33

Castleford, David. "Optical crosstalk in WDM Fibre-Radio networks /." Connect to thesis, 2002. http://eprints.unimelb.edu.au/archive/00000405.

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34

Wang, Xie, and 王勰. "Multiwavelength optical sources based on fiber optical parametric process." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2014. http://hdl.handle.net/10722/206438.

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With ever-increasing networking bandwidth demand imposed by data explosion in recent years, optical source generation plays a more and more important role in fiber optical communications. Today wavelength-division-multiplexing (WDM) which refers to encoding independent information onto different wavelengths becomes a widely used technique to increase the transmission bandwidth. However, current WDM system usually requires one single laser source for each distinct wavelength channel which is relatively expensive and cumbersome. Moreover, current WDM system is usually confined to conventional band (C-band) due to the lack of proper gain medium outside C-band. Thus simultaneously generating multiple wavelengths beyond C-band is highly desirable and attractive. Fiber optical parametric amplifier (FOPA) which is based on χ^((3)) nonlinear effect of optical fiber exhibits remarkable properties such as high gain, wide gain bandwidth, and ultra-fast response and could act as a promising candidate for amplifying optical signal beyond C-band. In this thesis I propose and demonstrate several multiwavelength optical sources by taking advantaging of the parametric process. I first experimentally demonstrate the dual-cavity mode-locked FOPO by utilizing two intracavity branches which share the same highly-nonlinear dispersion-shifted fiber (HNL-DSF) as gain medium. Simultaneous generation of 10-GHz pulse train at four different wavelengths located in short wavelength band (S-band) and long wavelength band (L-band) can be achieved. I then introduce the first dispersion distributed FOPO at 10-GHz. With this more advanced cavity configuration, narrower wavelength spacing and wider tuning range in the S- and L-band can be obtained more efficiently in a single cavity. In addition to multiwavelegnth 10-GHz FOPO, multiwavelength FOPO at higher repetition rate beyond C-band is also of great interest in fiber optical communication. I then achieve the first widely tunable 40-GHz dual-wavelength pulsed FOPO. Good quality pulses in both S-and L-band with relatively short duration and low timing jitter can be generated simultaneously. Apart from the parametric process in uniform fiber, I also explore the parametric process in dispersion oscillating fiber (DOF) whose dispersion is periodically modulated along the propagation direction. Based on quasi-phase matched parametric process in DOF, we generate two pairs (quad-wavelength) of modulation instability (MI) side lobes simultaneously. We then numerically and experimentally investigate the spectral correlation between multiple MI by leveraging the dispersive Fourier transformation method. My research efforts presented in this thesis will show the versatility of parametric process for generating multiwavelength optical waves. These schemes have the potential to become efficient optical sources for optical communication beyond C-band.
published_or_final_version
Electrical and Electronic Engineering
Doctoral
Doctor of Philosophy
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35

Montgomery, Michael C. "DMACS : a media access protocol for single-hop wavelength division multiplexed lightwave networks /." Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-06232009-063355/.

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36

Pelegrina, Bonilla Gabriel [Verfasser]. "Asymmetric fused fiber couplers for wavelength- and space-division multiplexing / Gabriel Pelegrina Bonilla." Hannover : Technische Informationsbibliothek und Universitätsbibliothek Hannover (TIB), 2015. http://d-nb.info/1077017774/34.

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37

Gross, Michael Charles. "High-rate, short-pulse sources:jitter and pedestal level in optical time-division multiplexing." Diss., Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/5405.

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38

Anan, Muhammad Taqiuddin Chaudhry Ghulam M. "SWAP a slotted wavelength assignment pipeline scheduler for next-generation optical burst switches (OBS) /." Diss., UMK access, 2008.

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Thesis (Ph. D.)--School of Computing and Engineering. University of Missouri--Kansas City, 2008.
"A dissertation in electrical & computer engineering and telecommunications networking." Advisor: Ghulam M. Chaudhry. Typescript. Vita. Title from "catalog record" of the print edition Description based on contents viewed Sept. 12, 2008. Includes bibliographical references (leaves 152-169). Online version of the print edition.
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39

Zhu, Jiannan. "Novel energy-efficient DWDM systems for low-cost optical communication applications." Thesis, University of Cambridge, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.709467.

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40

Abujnah, Nabeil Abduljallil Abubaker. "Numerical modelling of optical micro-cavity ring resonators for WDM networks." Thesis, University of South Wales, 2011. https://pure.southwales.ac.uk/en/studentthesis/numerical-modelling-of-optical-microcavity-ring-resonators-for-wdm-networks(ac752a5d-5bf1-4ee6-8345-c20fe8aea769).html.

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Augmenting the level of integration for a lower cost and enhancing the performance of the optical devices have turned out to be the focus of many research studies in the last few decades. Many distinct approaches have been proposed in a significant number of researches in order to meet these demands. Optical planar waveguides stand as one of vital employed approach in many studies. Although, their low propagation loss, and low dispersion, they suffers from high power losses at sharp bends. For this reason, large radius of curvature is required in order to achieve high efficiency and compromise the high level of integration. For the purpose of this research, in this thesis different ways to improve the performance of optical microcavity ring resonators (MRRs) have been thoroughly investigated and new configurations have been proposed. The Multiresolution Time Domain (MRTD) technique was further developed and employed throughout this thesis as the main numerical modelling technique. The MRTD algorithm is used as a computer code. This code is developed and enhanced using self built Compaq Visual Fortran code. Creating the structure and Post-processing the obtained data is carried out using self built MATLAB code. The truncating layers used to surround the computational domain were Uniaxial Perfectly Matched Layers (UPML). The accuracy of this approach is demonstrated via the excellent agreement between the results obtained in literature using FDTD method and the results of MRTD. This thesis has focused on showing numerical efficiency of MRTD where the mesh size allowed or the total number of computed points is about half that used with FDTD. Furthermore, the MRR geometry parameters such as coupling gap size, microring radius of curvature, and waveguide width have been thoroughly studied in order to predict and optimise the device performance. This thesis also presents the model analysis results of a parallel-cascaded double-microcavity ring resonator (PDMRR). The analysis is mainly focus on the extraction of the resonant modes where the effect of different parameters of the structure on transmitted and coupled power is investigated. Also, accurate analysis of 2D coupled microcavity ring resonator based on slotted waveguides (SMRR) has been thoroughly carried out for the purpose of designing optical waveguide delay lines based on slotted ring resonator (SCROW). The SCROW presented in this thesis are newly designed to function according to the variation of the resonance coupling efficiency of a slotted ring resonators embedded between two parallel waveguides. The slot of the structures is filled with SiO2 and Air that cause the coupling efficiency to vary which in turn control both the group velocity and delay time of SCROW structures results from the changing the properties of the bent slotted waveguide modes which strongly depends on the slot’s position. Significant improvements on the quality factor and greater delay time have been achieved by introducing sub-wavelength-low-index slot into conventional waveguide.
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41

Lo, Kung-meng. "Routing and protection issues in optical WDM mesh networks." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2008. https://ro.ecu.edu.au/theses/222.

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The advents of Wavelength Division Multiplexing (WDM) and then Dense WDM (DWDM) allow today's optical networks to simultaneously serve huge amount of traffic requirements. Particularly, the explosion of video, TV and other high bandwidth realtime traffic requires more and more bandwidth that except WDM or DWDM networks, other electronic-based transport networks cannot accomplish. WDM networks have been de factor as the long haul backbone networks around the world. To maintain these facilities is important because with up to 100 Tbps of data flowing through a single fibre in WDM networks, failure can result in huge transmission data losses, breakdown of many service operations and business revenues losses. Designing efficient Routing and Wavelength Assignment (RWA) strategy and protection scheme to optimise capacity efficiency are still open questions. The design efficiency in not only the physical topology of WDM networks but also in the logical topology is becoming very crucial. In this thesis, we study the problem of routing and protection in WDM networks and aim to optimize the amount of bandwidth used to satisfy the requirements of traffic connections between end-nodes. One significant factor in a WDM network, different from other electronic-based networks, is that it requires assigning wavelength channels along working and protection routes of connections. The placement of full wavelength converters (WCs) at network nodes would reduce the complexity of the problem but significantly increase the investment cost. In contrast, when there are no WCs in the network, the wavelength continuity is required along working and backup routes. This increases not only the complexity of problem but also the blocking probability in the networks. Our objective is to maintain the blocking probability as low as possible and minimise the investment required by placing WCs only at a minimum number of nodes. This problem is referred to as Sparse Wavelength Converters Placement (SWCP) problem. Considering the SWCP problem with both routing and protection at the same time to maximize the performance of available resources is very important in WDM networks. The design of wavelength routing, protection procedures themselves and the interaction between these procedures allows us to minimize the blocking probability. V./e study the effect of nodal-degrees on the distribution of the traffic load and the blocking probability over the network. From that, we determine the optimal locations to place wavelength converters which minimize the blocking probability. We develop an adaptive RWA approach for wavelength routing strategy. Our results show that our SWCP algorithm selects WCs with the conversion density 0.2 in the entire network and the blocking performance using the adaptive RWA algorithms is very similar to that of full deployed WCs in the networks. We also investigate a protection strategy known as Preconfigured Protection Cycle (p-Cycle). The reason of considering p-cycle as a key protection strategy is that it provides fast restoration for optical connections (lightpaths) clue to its ring-like structure and pre-connected back up paths before failure, as well as its ability to achieve low capacity redundancy because each straddling link on a cycle can provide double protection capacity clue to the nature of cycle. Although current research shows that p-cycles can achieve low capacity redundancy (about 35%), this result is obtained for static traffic and ignores the wavelength assignment problem. Therefore, finding a good set of p-cycles to minimise capacity redundancy in real dynamic networks are the main issues of this study. For the problem of finding good set of p-cycles, we develop three approaches of cycle selection to deliver fast computation with minimum spare capacity. Two approaches are designed for selecting a limited number of qualified candidates, then we use the Integer Linear Programming (ILP) model for determining the optimal set of p-cycles. The third approach is a heuristic approach. To achieve the optimal solution, p-cycle is iteratively selected one by one with the best efficiency until all working traffic is full protected, then a refined cycles selection is performed to complete the selection. Finally, for the efficiency of p-cycle in real dynamic networks, we analyse the variations of blocking performance within sparse wavelength conversion networks. We also compare the capacity efficiency and computational complexity when using p-cycles as span protection and path protection. These studies are critical and they have not been investigated before.
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42

Kang, Byungkyu. "Design of survivable WDM network based on pre-configured protection cycle." Connect to thesis, 2006. http://portal.ecu.edu.au/adt-public/adt-ECU2007.0015.html.

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43

Zhou, Chuang. "Multimode wavelength division multiplexing and demultiplexing using substrate-guided waves and volume holographic gratings /." Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.

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44

Gross, Michael Charles. "High-rate, short-pulse sources jitter and pedestal level in optical time-division multiplexing /." Available online, Georgia Institute of Technology, 2004:, 2003. http://etd.gatech.edu/theses/available/etd-04082004-180157/unrestricted/gross%5Fmichael%5Fc%5F200312%5Fphd.pdf.

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45

Poudel, Sunil. "Study on Fault Detection andLocalization for Wave length Division Multiplexing Passive Optical Network." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-129299.

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Wavelength division multiplexing passive optical network (WDM-PON) can meet growing bandwidth demand in access network by providing high bandwidth to the end users. Failure in the access network is becoming critical as a large volume of traffic might be affected. Therefore, an effective supervision mechanism to detect and localize the fault is required to shorten the service interruption time. Meanwhile, open access provides a certain freedom for end users to choose the service and hence boosts competition among service/network providers. On the other hand, to offer open access in WDM-PON could result in a substantial change on architectural design, e.g., multiple feeder fibers (FFs) instead of a single one may be required to connect different service/network providers. Consequently, the traditional supervision mechanisms don’t work properly in open WDM-PON. To fill in this gap, several fault supervision mechanisms to support open access in WDMPON are proposed in this thesis. They can be applied to both disjoint and co-located FF layout where the choice of providers is done through wavelength selection. The feasibility of such solutions has been validated by evaluating transmission performance. We have carried out simulations in VPItransmissionMaker for different deployment scenarios. The results have confirmed that no significant degradation of the transmission performance is introduced by the proposed monitoring schemes compared to the benchmark, where no any fault supervision method is implemented.
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46

Saad, Mohamed Elsayed Mostafa Luo Zhi-Quan. "Design of optical networks: performance bounds, complexity and algorithms /." *McMaster only, 2004.

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47

Chi, Yu-Chieh, and 紀裕傑. "Hybrid Wavelength-Division-Multiplexing Transport Systems." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/qz9hjt.

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碩士
國立臺北科技大學
光電工程系研究所
95
Wavelength-division-multiplexing (WDM) transport system can transmit many signals in single fiber, so have benefits like capacity upgrade and network flexibility, especially for Radio-on-Fiber (ROF) transport system and Passive Optical Network (PON) applications. Hybrid WDM transport system that uses different wavelengths to transmit AM-VSB analog video, 64/256-QAM digital passband and OC-48/OC-192 digital baseband signals is very useful for an optically amplified fiber network providing CATV, internet and telecommunication services. Current WDM transport systems are composed of distributed feedback (DFB) laser diodes and erbium-doped fiber amplifiers (EDFAs) throughout the single mode fiber (SMF) link. In this thesis, we exhibit several different ways to build the WDM transport systems and improve systems’ transmission performance. First, a cost-effective architecture is proposed for deployment in WDM transport systems, as demonstrated by the vertical cavity surface emitting lasers (VCSELs) and semiconductor optical amplifier (SOA) with external light injection technique. VCSEL is gradually used to replace DFB laser diodes for the 1.55μm wavelength window in lightwave transport systems, because it’s with a single mode with narrow linewidth and low cost. Amplify the optical signal by use SOA to replace EDFA, and use the external light injection technique to reduce the SOA-induced distortion and crosstalk. Second, we use amplified spontaneous emission (ASE) light source and WDM demultiplexer (DEMUX) to demonstrate radio-on-DWDM transport system. The ASE light source, which is supplied by EDFA output light source. The ASE light source can be efficiently divided into many channels by using DEMUX or optical bandpass filters (OBPFs). Therefore, the ASE source can be changed into a similar DFB laser diode characteristic by using the OBPF. In addition, employs LEAF to replace the SMF as the transmission medium. Third, we proposed a radio-on-DWDM transport system based on injection-locked Fabry-Perot (FP) LDs. Multiple longitudinal FP LD exhibits a wide spectrum spread. This wavelength spread will cause higher intensity noise and higher fiber dispersion-induced nonlinear distortions. When an FP LD is injection-locked, its multiple longitudinal modes will be changed into a similar single longitudinal mode characteristic, thus it can be utilized as a cheap light source in radio-on-DWDM architecture. Finally, we proposed and demonstrated a potentially cost-effective hybrid WDM transport system based on mutually injection-locked FP LDs. By mutual injection between two FP LDs, we realized a broadband light source with flatness and multimode output spectrum. This proposed hybrid WDM transport system used two wavelengths (modes) for AM-VSB video signal, one for 256-QAM digital passband and one for OC-48 digital baseband signals. Since our proposed WDM transport system does not use multiple expensive DFB LDs, it reveals a prominent one with simpler and more economic advantages than that of traditional hybrid WDM transport systems.
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48

wu, Chi-Shou, and 吳啟守. "A Dense Wavelength Division Multiplexing Scheme using Wavelength Multiplexing in Photorefractive Volume Holography." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/39378018339086734494.

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碩士
中原大學
應用物理研究所
90
Dense-wavelength division multiplexing (DWDM) is an important scheme for increasing communication capacity in fiber optic communication. There are various approaches for implementing DWDM and each approach has its advantages and disadvantages. A successful DWDM should have a large number of channels (for which a narrow 3-dB bandwidth or channel spacing is needed), and environmental resilience. Since volume holography has been used in information storage with various multiplexing schemes, including angular, wavelength, and phase multiplexing, for increasing the storage capacity, it is easy to conclude that there is a potential application of volume holography in DWDM. Since the grating period in a typical reflection hologram is much smaller than that of a transmission hologram, a reflection hologram can result in a larger storage capacity than that of a transmission hologram. The information storage capacity of a volume hologram is determined by its Bragg selectivity. There are various approaches for calculating this selectivity, which includes the Coupled Wave Theory, Born’s Approximation, and recently, the Phase Summation Method. Since the Coupled Wave Theory can take into account both linear and nonlinear interaction between the incident light and the hologram grating, the Bragg selectivity derived from this theory represents the most accurate result. However, it provides no formula for predicting either the HWFZ (half width at first zero) or the FWHM (full width at half maximum), which is essential for designing appropriate bandwidth in DWDM. This thesis has verified that the Bragg selectivity calculated by using the Phase Summation Method in the regime of low diffraction efficiency is the same as that of Coupled Wave Theory. This thesis is the first to derive a formula for calculating HWFZ for the Bragg selectivity of reflection hologram using the Phase Summation Method. This thesis also proposes a DWDM scheme using volume holography and is the first to establish a unique design protocol for DWDM using a reflection hologram as detailed below. However, the HWFZ for each center wavelength increases as the wavelength increases. In order to make the bandwidth of each center wavelength must be equal. This thesis is the first to propose an innovative approach to combine both angular multiplexing with wavelength multiplexing in order to keep the bandwidth constant within the S, C, and L band of the fiber transmission window. Using the above results, this thesis has provided a DWDM design, which consists of 2048 channels and a channel spacing of 0.05nm using a photorefractive crystal of LiNbO3 and reflection holography. Keywords:Dense wavelength division multiplexing, fiber optic communication, Photorefraction, reflection hologram, volume holography, angular multiplexing, wavelength multiplexing, LiNbO3
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49

Ayadi, Fakher. "Optical fiber networks : wavelength division and code-division multiplexing." Thesis, 1994. http://spectrum.library.concordia.ca/3834/1/NN10821.pdf.

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50

"Tunable devices for wavelength-division multiplexing communications." 2000. http://library.cuhk.edu.hk/record=b6073261.

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by Mak Wing-keung.
"August 2000."
Thesis (Ph.D.)--Chinese University of Hong Kong, 2000.
Includes bibliographical references.
Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web.
Mode of access: World Wide Web.
Abstracts in English and Chinese.
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