Thematische Bibliographien / Optical fiber network

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  1. Zeitschriftenartikel
  2. Dissertationen
  3. Bücher
  4. Buchteile
  5. Konferenzberichte
  6. Berichte der Organisationen

Auswahl der wissenschaftlichen Literatur zum Thema „Optical fiber network“

Autor: Grafiati
Veröffentlicht am 5. April 2025

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Zeitschriftenartikel zum Thema "Optical fiber network"

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Bilal, Mehak. „EDFA and Optical Fiber Repositioning in an Optical Fiber Communication Network“. International Journal for Research in Applied Science and Engineering Technology 9, Nr. 11 (30.11.2021): 1100–1105. http://dx.doi.org/10.22214/ijraset.2021.38874.

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Abstract: This study shows an easy and effective design of an optical fiber communication system, which demonstrates EDFA's ideal position in the whole system. In recent years, erbium-doped fiber amplifiers (EDFAs) have been more attentive with the development of high-speed and long-distance data transmission systems. In our research, EDFA's forward pump capacity is maintained at 100mW, and our three configurations modify and analyze the location of EDFA. First configuration is meant to place EDFA before optical fiber in the entire system. The second arrangement has been intended such that EDFA will precede optical fiber. EDFA is inserted in the third configuration between the optical fiber length. For the three setups, the BER, Q factor and output power level were observed, with the setup one having minimal BER, setup two with the greatest power, and setup three with the maximum Q factor. This paper discusses the causes behind these results and designers may construct an optical fiber communication system in the most efficient and reliable fashion by taking those results into consideration. The simulation was performed in Opti-System software. Keywords: EDFA, BER, Q factor, Analyzer, Optical fibre
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Klinkowski, Mirosław, und Marek Jaworski. „Planning of Optical Connections in 5G Packet-Optical xHaul Access Network“. Applied Sciences 12, Nr. 3 (22.01.2022): 1146. http://dx.doi.org/10.3390/app12031146.

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One of the main challenges in dense 5G radio access networks (RANs) is provisioning of low-cost connectivity between a large number of antennas, located at remote sites, and a central site (hub) in which baseband processing functions are performed. Packet-switched Ethernet and wavelength division multiplexing (WDM) are two principal transport network technologies enabling the reduction of the demand for direct optical fiber connections between the antennas and the hub. Whereas Ethernet allows for statistical multiplexing of multiple xHaul (fronthaul/midhaul/backhaul) flows and their aggregation in a high-capacity transmission link, WDM makes it possible to establish a number of such links (using different wavelengths) in a single optical fiber. Additional savings in the amount of fibers required can be achieved by means of optical add-drop multiplexers (OADMs) that allow for obtaining access to unused wavelengths by intermediate remote nodes, whenever the capacity on the WDM system is not fully utilized by the end remote node. In this work, we focus on the problem of planning optimal fiber connections, including the placement of OADMs for a set of wavelength demands at remote sites, with the aim of minimizing the amount of fibers used in a packet-optical xHaul access network carrying 5G traffic. We consider a passive WDM system in which the maximum transmission distance, estimated using an optical power-budget model, depends on the number of OADMs that are present on the transmission path. To formulate and solve the optimization problem, we make use of integer linear programming (ILP). We apply the ILP model in network analysis. In particular, by means of numerical experiments performed for two different network topologies, we study the impact of traffic load (in terms of the number of requested wavelengths) and optical multiplexer loss on the number of transmission paths that have to be established in the network. Obtained results show that the savings in fiber connections of up to 65% can be achieved in a packet-optical xHaul network if OADMs are used when compared to the scenario without OADMs.
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Abbas, Huda Saleh, und Mark A. Gregory. „Passive Optical Network Survivability: Protection, Detection and Restoration“. International Journal of Information, Communication Technology and Applications 1, Nr. 1 (09.03.2015): 128–42. http://dx.doi.org/10.17972/ajicta20151115.

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Passive optical network (PON) technologies have received increasing attention as demand for fibre access networks has grown. Enhancing fibre access network reliability provides lower operational costs, and improves customer satisfaction. This paper discusses PON survivability including protection schemes for the fiber link and the Optical Line Terminal (OLT), the exciting monitoring techniques of the fiber link, and the effect of reducing the restoration time on the network availability. The main contribution of this study is to provide two protection schemes namely OLT-only-protected and OLT-and-ring protected. The proposed schemes are designed to handle instances of single failure affecting all customers in the network. This work considers three key performance metrics- Failure Impact Robustness (FIR), cost, and availability. The objective of the proposed protection architectures is to guarantee high quality of service at low costs by protecting critical network elements such as OLT and fiber ring. The proposed architectures have been compared with other well-known protection schemes. The results postulate that OLT-and-ring protected approach has 99.993% availability with a 0.09% increase in cost compared to the ring-only protection architecture.
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Li, Chung-Yi, Ching-Hung Chang und Zih-Guei Lin. „Single-Line Bidirectional Optical Add/Drop Multiplexer for Ring Topology Optical Fiber Networks“. Sensors 21, Nr. 8 (09.04.2021): 2641. http://dx.doi.org/10.3390/s21082641.

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A new type of passive single-line bidirectional optical add/drop multiplexer (SBOADM) is proposed and experimentally demonstrated. When the proposed SBOADM is placed as a node of a ring topology optical fiber network, the special routing function of the SBOADM can always drop down the desired downstream signals whether the signals are injected into the SBOADM in either the clockwise (CW) or counterclockwise (CCW) direction and can upload and send back the upstream signals via the reversed optical pathway of the downstream signals. Once fiber link failure occurs in the optical network, the blocked network connections can be recovered immediately by sending out the downstream signals in both the CW and CCW directions of the fiber ring. As in all passive devices, the SBOADM needs no power supply or complicated network management to achieve the bidirectional function. Thus, the proposed device is an optimal solution to enhance the stability and reliability of rapidly developed optical fiber networks.
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Kaczmarek, Sylwester. „Multistage optical switching networks“. Journal of Telecommunications and Information Technology, Nr. 2 (30.06.2002): 21–25. http://dx.doi.org/10.26636/jtit.2002.2.127.

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The backbone networks evolution to high-speed DWDM networks generates new problems for switching. This function element must be also based on optical technology. For large capacity this cannot be realized by a single matrix, but by multistage switching networks. In the paper three types of optical matrices have been described: fiber switch FX, wavelength fiber switch WSX and wavelength interchanging fiber switch WIX. Based on these matrices, four switching network constructions were considered. The connection properties of these switching networks were evaluated, determining the electronic equivalent switching network for which these properties are well known.
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Li, Jingyao. „The application of optical fiber in network communication“. Applied and Computational Engineering 35, Nr. 1 (22.01.2024): 141–46. http://dx.doi.org/10.54254/2755-2721/35/20230384.

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In recent years, optical fiber communication has gained widespread use in daily life due to its robust communication and transmission capabilities, strong confidentiality, anti-interference properties, and the availability of convenient and accessible materials. This technology has made remarkable strides in network communication and integrated device design, among other areas. This article will commence by discussing the fundamental structure of optical fibers and illustrating the propagation of optical signals within them. It will then analyze the benefits, such as higher transmission rates, wider frequency bands, and the low loss characteristics of optical fibers. Subsequently, the article will enumerate two of the most commonly utilized Optical Fiber Communication (OFC) technologies: Wavelength Division Multiplexing (WDM) technology and optical amplifier technology. It will summarize their principles and strengths. Finally, the article will showcase the practical applications of optical fiber communication, particularly focusing on its role in 5G mobile communication, military operations, and radio and television communication.
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Ibrahimov, Bayram. „Research and analysis of the efficiency fiber-optic communication lines using DWDM technologies“. International Robotics & Automation Journal 9, Nr. 1 (28.03.2023): 35–38. http://dx.doi.org/10.15406/iratj.2023.09.00260.

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The performance indicators fiber-optic communication lines using spectral technology with separation communication channels are analyzed. The effectiveness of the use network resources optical telecommunication systems using spectral technologies based on the architectural concept of the next NGN (NGN, Next Generation Network) and future FN (FN, Future Network) networks has been studied. This work is devoted to the construction methods for calculating the indicators optical networks and the study methods and tools for improving the efficiency using network and channel resources fiber-optic communication lines using dense spectral multiplexing optical signals with separation communication channels. The problem ensuring effective management channel and network resources in optical communication networks are considered. As a result of the study technology spectral multiplexing, a new approach to the construction of a calculation method is proposed that describes the efficiency managing network and channel resources in fiber-optic communication lines, taking into account the numerous requirements their parameters and transfer characteristics. On the basis of the calculation method, analytical expressions are obtained that allow estimating the resources of the system, indicators informational and spectral efficiency of the functioning fiber-optic communication lines. The results of the research can be applied by cellular operators when designing an optical telecommunications network, in particular, to determine the optimal value of the capacity optical systems based on wavelength multiplexing technology and modulation spectral efficiencies.
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Pereira, Oeber Izidoro, Edgar Manuel Carreño-Franco, Jesús M. López-Lezama und Nicolás Muñoz-Galeano. „Specialized Genetic Operators for the Planning of Passive Optical Networks“. Computers 13, Nr. 10 (10.10.2024): 259. http://dx.doi.org/10.3390/computers13100259.

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Passive Optical Networks (PONs) are telecommunication technologies that use fiber-optic cables to deliver high-speed internet and other communication services to end users. PONs split optical signals from a single fiber into multiple fibers, serving multiple homes or businesses without requiring active electronic components. PONs planning involves designing and optimizing the infrastructure for delivering fiber-optic communications to end users. The main contribution of this paper is the introduction of tailored operators within a genetic algorithm (GA) optimization approach for PONs planning. A three vector and an aggregator vector are devised to account, respectively, for physical and logical connections of the network, facilitating the execution of GA operators. This codification and these operators are versatile and can be applied to any population-based algorithm, not limited to GAs alone. Furthermore, the proposed operators are specifically designed to exploit the unique characteristics of PONs, thereby minimizing the occurrence of unfeasible solutions and accelerating convergence towards an optimal network design. By incorporating these specialized operators, this research aims to enhance the efficiency of PONs planning, ultimately leading to reduced costs and improved network performance.
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Freitas, Alexandre, und João Pires. „Using Artificial Neural Networks to Evaluate the Capacity and Cost of Multi-Fiber Optical Backbone Networks“. Photonics 11, Nr. 12 (24.11.2024): 1110. http://dx.doi.org/10.3390/photonics11121110.

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A possible solution to address the enormous increase in traffic demands faced by network operators is to rely on multi-fiber optical backbone networks. These networks use multiple optical fibers between adjacent nodes, and, when properly designed, they are capable of handling petabits of data per second (Pbit/s). In this paper, an artificial neural network (ANN) model is investigated to estimate both the capacity and cost of a multi-fiber optical network. Furthermore, a fiber assignment algorithm is also proposed to complement the network design, enabling the generation of datasets for training and testing of the developed ANN model. The model consists of three layers, including one hidden layer with 50 hidden units. The results show that for a large network, such as one with 100 nodes, the model can estimate performance metrics with an average relative error of less than 0.4% for capacity and 4% for cost, while achieving a computation time nearly 800 times faster than the heuristic approach used in network simulation. Additionally, the network capacity is around 5 Pbit/s.
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WEN, HAO, ZHENG-FU HAN, GUANG-CAN GUO und PEI-LIN HONG. „QKD NETWORKS WITH PASSIVE OPTICAL ELEMENTS: ANALYSIS AND ASSESSMENT“. International Journal of Quantum Information 07, Nr. 06 (September 2009): 1217–31. http://dx.doi.org/10.1142/s0219749909005730.

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Quantum Key Distribution (QKD) networks are the trends toward multiple users' unconditional secure communication. Based on several passive optical devices, such as beam splitter, optical switch or wavelength divided multiplexer, various types of fiber-based QKD networks have been proposed. However, it is still hard to accurately assess these networks. To find the optimal solution, a general assessment that would not involve detailed schemes is quite necessary. In this paper, we introduce an evaluation method and analyze optical-device-based QKD networks including two rational aspects: (i) network connectivity and network bandwidth which reflect the network's flexibility and performance in theory; (ii) network cost that brings pragmatic restriction on the network construction in practice. Applying this model, we compare five typical types of optical-device-based QKD networks. The explicit results demonstrate the above networks' characteristics and some valuable conclusions.
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Dissertationen zum Thema "Optical fiber network"

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Okonkwo, Igweani Uchenna Titus. „Optical fiber transmission systems for in-door next generation broadband access network“. Thesis, Brunel University, 2014. http://bura.brunel.ac.uk/handle/2438/10539.

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This thesis investigates the generation and radio-over-fibre (RoF) transport of unlicensed 60 GHz millimetre-wave (mm-wave) frequency band. The investigated benefits of transmission schemes applicable for the mm-wave generation include optical carrier suppression (OCS), optical frequency multiplication (OFM) and remote heterodyne detection (RHD). For the in-door cabling of the mm-wave transmission, a low-cost polymer optical fibre (POF) along with bend-insensitive single mode fibre (BI-SMF) has been investigated for short-range networks. Transporting mm-wave generated signals over POF and BI-SMF cables based on OCS scheme showed results with the highest spectral efficiency and least inter-symbol interference over a 2.5 Gbit/s data delivery. Based on this thesis analysis, OCS simulation of POF showed the most reliable power penalty performance and receiver sensitivity at 30-m whilst the BI-SMF fiber produced equal observations at 150-m and more. In observing the free space links of delivering the RoF signal, the attenuation on the received signal power for both POF and BI-SMF was insignificant but expected, as the simulation assumed complete and total collimation of the light beams onto the aperture of the photodetector. OCS scheme for mm-wave generation and transport was explored based on the cost effectiveness of using one external modulator compared to other generation schemes that utilised more than one external modulator. OFM scheme was simulated to transport LTE and Wi-Fi signals along with 60 GHz RF band through both SMF and MMF-POF/BI-SMF cables. OFM transport scheme produced the highest attenuation on LTE, Wi-Fi and mm-wave signals carrying 100 Mbit/s data as simulated POF lengths increased. The best performance POF length was observed at 10-m. The application of offset launch technique at the coupling of SMF and POF showed insignificant improvement on signal bandwidth. The free space OFM transmission also demonstrated negligible change to the received signal power. This reinforces the attributes of deploying OWC system in an in-door environment. In other investigation, the simulated successful delivery of mm-wave signal using RHD scheme modulated and transported 10 Gbit/s data signal over POF and BI-SMF cables. Additional observed unrecorded result also showed BI-SMF cable maintained a 2% reduction of received power for 450-m fiber cable from 150-m. The attributes to RHD includes its low operating power system application and delivery of localised 60 GHz signal for uplink RoF transmission. The conceptualised design of Gigabit data delivery for indoor customer applications either through POF or BI-SMF cable, transporting various wireless channels has been presented in this thesis for the design of a robust next generation Broadband access network to reinforce the fiber-inside-the-home (FiTH) deployment.
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Tariq, Sana. „Inside all-optical networks /“. Online version of thesis, 2009. http://hdl.handle.net/1850/10960.

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Quintana, Joel. „Hybrid optical network using incoherent optical code division multiple access via optical delay lines“. To access this resource online via ProQuest Dissertations and Theses @ UTEP, 2009. http://0-proquest.umi.com.lib.utep.edu/login?COPT=REJTPTU0YmImSU5UPTAmVkVSPTI=&clientId=2515.

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Angeh, Wolfgang Ondua. „Design and performance analysis of a survivable metropolitan area fiber optic communication network“. Master's thesis, This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-02022010-020030/.

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Wang, Evan Y. (Ye-Wen). „Traffic control in a multichannel optical fiber communication network“. Thesis, Massachusetts Institute of Technology, 1987. http://hdl.handle.net/1721.1/14716.

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Cindoğlu, Beylem. „User Research and Development on Optical Fiber Network Installations“. Thesis, KTH, Maskinkonstruktion (Inst.), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-198178.

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Detta examensarbete är ett projekt som genomförs på Infinera i Stockholm, Sverige. Projektet använder tjänsten designmetodik tillsammans med användarcentrerad design. Syftet med projektet är att undersöka och förbättra det dagliga arbetslivet för installatörer av fiberoptiska nät. Den aktuella tjänsten följer ett systemdrivet perspektiv. Detta projekt undersöker olika sätt att ändra ett systemdrivet perspektiv till ett användarcentrerat designperspektiv. Tjänstedesignmetoder används för att undersöka serviceprocessen och att samla insikter. Projektet inleds med en förberedelsefas, följt av loop 1 och 2. Förberedelsefasen används för att få en djupare förståelse för fiberoptiska nät. Loop 1 och loop 2 inkluderar metoder såsom skuggning, en dag i livet, intervjuer och kartor över kunders resor. I dessa loop faser ingår interaktion med kund, analys av kundens interaktioner samt idealisering från dessa analyser och begrepp. Fem huvudproblem identifieras i processen. Dessa delas in i två kategorier som processrelaterade problem och användarrelaterade problem. Resultaten visar att den främsta orsaken bakom processproblem är brist på kommunikation mellan avdelningar inom företaget. Dessa problem är bland annat projektledares beteckning, bristande redovisning av arbete och överlämnandet mellan försäljningsavdelningen och tekniker. Överlämnandet mellan försäljningsavdelningen och tekniker väljs som ett nästa steg för fördjupning. Webbapplikationer formas som ett koncept för att lösa det problem som väljs. Projektet avslutas med förslag på webbapplikationer avseende lösningar för utvalda problem. Problemen identifieras relaterat till processen. Försäljningen till tjänsten överlämnande väljs för ytterligare förbättringar. Det genererade konceptet på detta problem förbättras och presenteras för företaget.
This thesis is a project that is conducted at Infinera located at Stockholm, Sweden. The project uses service design methodology alongside with user-centered design. The aim of the project isto examine and improve every day work lives of implementers of fiber optic networks. The current service is following a system-driven perspective. This project will examine ways to change this into a user-centered design perspective. Service design methods were used to investigate the service process and to gather insights. The project started with an initial preparation phase, followed by loop 1 and 2. Preparation phase was used to get a deeper understanding on fiber optic networks. Loop 1 and loop 2 included methods such as shadowing, a day in life, interviews and customer journey maps. These loop phases included interactions with the customers, the analysis of these interactions, ideation from these analysis and conceptualization. Five main problems were identified in the process. These were grouped into two as process related problems and user experience related problems. It is found out that the main reason behind process problems was lack of communication between departments in the company. These problems were project manager designation, lack of statement of work and the handover between sales department and technicians. The handover between sales department and technicians were selected as a next step to go on. Web applications were shaped as a concept to solve the problem that was selected. The project was finalized with suggestions on webapplications regarding the solutions of selected problems. The problems were identified related to the process. Sales to service handover was selected for further improvements. The generated concept on this problem was improved and presented to the company.
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Rotich, Enoch Kirwa. „Fibre optic network supporting high speed transmission in the square kilometre array, South Africa“. Thesis, Nelson Mandela Metropolitan University, 2015. http://hdl.handle.net/10948/6552.

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This thesis provides in-depth information on the high speed optical transport requirements for the Square Kilometre Array. The stringent data rates as well as timing and synchronization requirements are dealt with respect to the optical fibre technology. Regarding the data transport, we draw a clear comparison between a typical telecommunication access network and a telescope network. Invoking simulations and experiments on the field and laboratory test bed, we successfully implement a suitable telescope network using vertical cavity surface emitting laser (VCSEL) technology. Polarization effects on the KAT-7 telescope network, an operational prototype for the SKA is studied so as to estimate the expected effect in the MeerKAT telescope with transmission distances _ 12 km. The study further relates the obtained values to the expected impact on the distribution of the time and frequency reference in the MeerKAT array. Clock stability depends on the differential group delay (DGD) and polarization stability. On a 10:25 km link that includes the riser cable a DGD of 62:1 fs was attained. This corresponds to a polarization mode dispersion (PMD) coefficient of 19:4 fs=km1=2. This is a low PMD value considering telecommunication network. The PMD value is within the allowed budget in the telescope network. However, this may not be the case at longer baselines extending to over 1000 km as expected in SKA 2. The fibre's deployment contribution to the DGD is measured by comparing the deployed fibre to the undeployed of equal lengths. On the 10:25 km deployed single mode fibre, the maximum and mean DGDs measured were 217:7 fs and 84:8 fs respectively. The undeployed fibre of similar type and equal length, gave a maximum and minimum DGDs of 58:6 fs and 36:3 fs respectively. The deployment is seen to increase the maximum and minimum DGDs by factors of 3.7 and 2.3 respectively. This implies that fibre deployment is very critical in ensuring the birefringence is minimized. Polarization fluctuation recorded a maximum of 180o during the 15 hour real time astronomer use of the antenna. To ascertain the contribution of the riser cable, state of polarization (SOP) of the buried section of the single mode fibre in the link was established. A maximum SOP change of 14o over 15 hour monitoring was measured. From the stability realized on the buried section of the fibre, the change in polarization is contributed by the riser cable. The fluctuation in polarization can cause the phase of a clock signal to drift between the birefringent axes by an equal amount corresponding to DGD. We experimentally demonstrate how polarization stabilization can be attained using the polarization maintaining fibre. We also demonstrate the applicability of VCSEL technology in the SKA unidirectional data flow especially for shorter baselines < 100 km. The VCSEL is a low cost light source with attractive advantages such as low power consumption, high speed capabilities and wavelength tuneability. This work entails the use of traditional amplitude modulation commonly known as non-return-to-zero (NRZ) on-off keying (OOK) because of its simplicity and cost. For the MeerKAT typical distances, we show that even in a worst case scenario, the use of VCSEL on different fibres in MeerKAT distance is achievable. Using the impairment reduction approach, we successfully manage to achieve transmission distance beyond MeerKAT. Several in-line dispersion compensation mechanisms in telecommunication have been successfully employed. The work focused on the use of negative dispersion fibre to mitigate the chromatic dispersion effects in the optical fibre. The inverse dispersion fibre (IDF) is proposed for compensation in the conventional zero dispersion wavelength fibres, G.652 that are used at the third window. Similarly, the chromatic dispersion compensation of non-zero dispersion shifted fibre (NZDSF) is experimentally demonstrated using negative dispersion submarine reduced slope (SRS), G. 655 (-). With dispersion management, we demonstrate how transmissions beyond MeerKAT baselines can be achieved error free. A systematic investigation of the use of distributed Raman amplification to overcome the attenuation losses is provided. High on-off gains of up to 15 dB, 8 dB and 5 dB for bidirectional, forward and backward pumping respectively is achieved on a 25 km Raman optimized NZDSF-Reach fibre. Combined dispersion mitigation technique and low noise distributed Raman amplification, up to about 80 km transmission was achieved on a 4:25 Gbps modulated VCSEL using a single pump. Using bidirectional pumping, more than 100 km of transmission was achieved error free. The high gains enhance the VCSEL transmission distance. We further suggest a novel way of using the Raman pump to distribute the clock signal while amplifying the data signal streaming the astronomical data from the remote placed telescope receivers. In summary, the work presented in this thesis has demonstrated the potential use of VCSEL technology for data collection in the telescope array. We have studied the optical effects and mitigation so as to improve the clock and data transmission. This work is relevant and valuable in providing SKA with VCSELs, an option for extremely high network performance at reasonable costs.
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Ansari, Ashlaghi Aria. „100 GBPS Orthogonal Frequency Division Multiplexing optical fiber communication network“. Thesis, California State University, Long Beach, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1604879.

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Optical fiber communication has emerged as a high potential substitute for communication methods such as twisted pair and coaxial wire. The main advantage of optical fiber over previous methods is to have higher capacity of data rate transmission. The conventional types of modulation and demodulation technique, which have been used through optical fiber communication system are Wavelength Division Multiplexing (WDM) technique and Dense Wavelength Division Multiplexing (DWDM) technique so far.

In this thesis, the Orthogonal Frequency Division Multiplexing (OFDM) is applied through the modulation and demodulation parts due to some advantages over WDM and DWDM to reach to 100 Gbps data transmission. The main advantage of OFDM-optical fiber is that it only needs one optical source to modulate and one optical source to demodulate the signals at transmitter side and receiver side, which results in a reduction of the cost of the system. Also, by using the OFDM, the chromatic dispersion can be eliminated or decreased.

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Darweesh, Jamal. „Quantization of Neural Network Equalizers in Optical Fiber Transmission Experiments“. Electronic Thesis or Diss., Institut polytechnique de Paris, 2023. http://www.theses.fr/2023IPPAT025.

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L'avènement de la détection cohérente a ouvert la voie à la compensation des effets liés à la propagation dans les fibres optiques en utilisant le traitement numérique du signal (”DSP”). Alors que les effets linéaires, tels que la dispersion chromatique et la dispersion modale de polarisation, peuvent être compensées efficacement, la compensation des distorsions non linéaires reste aujourd'hui un défi compte-tenu des complexités d'implémentation. Dans ce travail, nous considérons les réseaux de neurones (”NN”) pour l'égalisation dans la trans- mission par fibre optique à double polarisation. Par rapport aux égaliseurs conventionnels tels que la rétropropagation numérique (”DBP”), les NN ne nécessitent pas d'informations sur l' état du canal, et peuvent atténuer les dégradations du signal avec une moindre complexité. Nous proposons un certain nombre d'algorithmes de quantification ”post-training” et ”training-aware” pour représenter les poids et les activations du NN en quelques bits, ceci afin de réduire la complexité de calcul, l'espace mémoire et la consommation d'énergie du DSP. Une analyse de performance et de complexité montrent que les algorithmes proposes surpassent les algorithmes d'égalisation linéaire et DBP dans plusieurs expériences de transmission. Cette thèse est réalisée dans le cadre du projet H2020 MSCA-ITN-EID REAL-NET, financée par la Commission Européenne (en collaboration avec le partenaire industriel, Infinera Corporation, en Allemagne et au Portugal)
The advent of the coherent detection paved the away for the compensation of the fibertransmission effects in the electrical domain using the digital signal processing (DSP).While the chromatic and polarization mode dispersion can be efficiently compensated withDSP, the compensation of the nonlinear distortions remains challenging.In this work, we consider neural networks (NNs) for nonlinearity mitigation in dualpolarization optical fiber transmission. Compared to the digital back-propagation (DBP),NNs do not require the fiber link parameters, and may mitigate the impairments withlower complexity.We propose two low-complexity NN equalizers: a convolutional-dense and an LSTM-dense model, placed at the end of the linear DSP to compensate the nonlinearities. Theseequalizers are evaluated in the context of three dual-polarization transmission experiments:a 9x50km true-wave classic fiber link, a 9x110km standard single-mode fiber link, and a17x70km LEAF fiber link. It is shown that the proposed NNs and DBP achieve about thesame Q-factors, both outperforming the linear DSP.We use quantization in order to reduce the computational complexity, storage sizeand energy consumption of the NN equalizers. We compare a number of post-trainingquantization (PTQ) and training-aware quantization (TAQ) algorithms for casting theweights and activations of the NN in few bits. For quantization above 5 bits, we showthat TAQ with straight-through estimation (STE) outperforms PTQ, since it mitigatesthe quantization noise during the training to some extent. For a Q-factor drop of less than0.5 dB compared to the unquantized NN, the storage and computational complexity of theNN can be typically reduced by over 90%. However, there is a bit width cut-off value ofaround 5 bits below which TAQ fails to outperform the linear DSP. This is because, theapproximation of the derivative of the quantizer in the STE is not sufficiently accurate atlow bit widths. Further, the proposed low-complexity models are not overparameterized,so that the quantization noise can be mitigated during the training at low bit widths. Itis shown that the quantization of the activations has a greater impact on the performancecompared to the quantization of the weights.Finally, we study extreme quantization of the NN equalizers below 5 bits. For thiscase, we propose three novel algorithms: successive PTQ (SPTQ), alpha-blending (AB)and successive AB (SAB) which is a hybrid algorithm that combines the SPTQ with AB.These algorithms are iterative, and incorporate ideas from PTQ and TAQ. We demonstrateiiithat the weights of the NN can be quantized up to one bit, if the activations are notquantized. Further, it is shown that both weights and activations can be quantized at 2-3bits, while still notably outperforming the linear equalization. Furthermore, we quantifythe impact of the quantization noise arising separately from the weights and activationson the Q-factor performance of the model. The results demonstrate for the first time thatlow-complexity binary NNs can mitigate nonlinearities in optical fiber communication.This PhD thesis is in the frame of a European Union's Horizon 2020 MSCA-ITN-EID REAL-NET project, grant agreement no. 813144, in collaboration with Infinera inGermany and Portugal
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Chu, Guang Yong. „Photonic devices for next generation fiber-to-the-home access network“. Doctoral thesis, Universitat Politècnica de Catalunya, 2016. http://hdl.handle.net/10803/386564.

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It would be unaffordable if the WDM-PON technologies were directly applied for massive deployment. Hence, the potential WDM-PON is to be integrated and improved in order to adapt it for NGPON and the future 5G. The UDWDM-PON can be considered as an ultimate solution for the next-generation access network capable of providing unlimited bandwidth for each user, thanks to the coherent detection. Plenty of scientists have believed that it is crucial to increase the operating speed and maximum reach of WDM-PON, while it has no sense if people achieve them without a ordable cost. In order to apply them cost-effciently, the system should require colorless ONUs and bidirectional systems. It is desired that the whole system use modulators on a low bias consumption, even limit the number of amplifiers. However, for bidirectional transmission the backscattering effects would limit the performance if we want to reuse the carrier from OLT. So, we should design a method to separate the wavelength between upstream and downstream. The traditional UDWDM-PON uses 2 laser at ONU, in this thesis, the single-DFB based ONUs are presented with integrated devices. What is the most plausible configuration? The photonic devices such as RSOA, DEML, FML with advanced configurations are presented in this thesis with different applications. The proposed thesis includes these parts: key devices for WDM-PON and the chirp parameters of these integrated photonic devices are measured, the polarization independent RSOA with different applications is also included, demonstration of dual output DEML with bidirectional coherent UDWDM-PON transmission, mitigating residual AM of DEML for phase modulation, and fast tuning for the UDWDM channel via FML are described.
Por sus altos requerimientos técnicos, sería inasumible aplicar las tecnologías WDM-PON directamente para el despliegue masivo de Fiber-to-the-Home de nueva generación. Por lo tanto, el potencial se WDM-PON se debe integrar y mejorar con el fin de adaptarlo para NGPON y el futuro 5G. Hoy dia, operadores, usuarios y científicos, ven crucial augmentar la velocitat de funcionament y el alcance de las redes de acceso PON, si bien no tiene sentido conseguirlo con un coste inasequible. El UDWDM-PON puede considerarse como una solución definitiva para la red de acceso de próxima generación, capaz de proporcionar ancho de banda ilimitado para cada usuario, gracias a la detección coherente, por lo que en esta tesis se aborda su realización con un coste e integración prácticos. Con el fin de aplicarlos de manera rentable, el sistema debería exigir a las ONU que sean idénticas, si láseres preseleccionados o incoloros, y ser bidireccionales. Se desea que el conjunto de moduladores del sistema tengan en un bajo consumo, e incluso limitar el número de amplificadores. Sin embargo, para la transmisión bidireccional los efectos de retrodispersión limitarían el rendimiento si queremos volver a utilizar la portadora generada en la OLT. Por lo tanto, debemos diseñar un método para separar la longitud de onda en las transmisiones de bajada y de retorno del usuario a la central. El tradicional UDWDM-PON utiliza 2 láseres en la ONU; en esta tesis, las ONUs usan dispositivos integrados basados en un sólo DFB. ¿Cuál es la configuración más plausible? Los dispositivos fotónicos como RSOA, DEML, FML con configuraciones avanzadas se presentan en esta tesis con diferentes aplicaciones, que resuelven distintos problemas técnicos. La tesis incluye las siguientes partes: análisis y medida de dispositivos fotónicos clave para WDM-PON con modulación de fase, la independencia a la polarización de RSOA con diferentes aplicaciones, demostración de DEML con doble salida para transmisión bidireccional coherente UDWDM-PON, mitigación de AM residual de DEML para la modulación de fase, y la sintonía rápida de canal de UDWDM a través de FML.
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Bücher zum Thema "Optical fiber network"

1

Nosu, Kiyoshi. Optical FDM network technologies. Boston: Artech House, 1997.

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2

Iraj, Najafi S., Porte Henri, European Optical Society, Society of Photo-optical Instrumentation Engineers. und Commission of the European Communities. Directorate-General for Science, Research, and Development., Hrsg. Fiber optic network components: 20-22 March 1995, Amsterdam, The Netherlands. Bellingham, Wash: The Society, 1995.

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IFIP TC6 Working Conference on Optical Network Design and Modelling (1997 Vienna, Austria). Optical network design and modelling: IFIP TC6 Working Conference on Optical Network Design and Modelling, 24-25 February 1997, Vienna, Austria. London: Chapman & Hall on behalf of the International Federation for Information Processing, 1998.

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Yŏnʼguwŏn, Hanʼguk Chŏnja Tʻongsin, und Korea (South) Chŏngbo Tʻongsinbu, Hrsg. Kwang intʻŏnet netʻŭwŏkʻŭ mit chʻegye chonghap yŏnʼgu =: Network engineering and integration for optical internet. [Seoul]: Chŏngbo Tʻongsinbu, 2005.

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W, Chan Vincent, Cryan Robert A, Senior John M. 1951- und Society of Photo-optical Instrumentation Engineers., Hrsg. All-optical communication systems: Architecture, control, and network issues : 25-26 October, 1995, Philadelphia, Pennsylvania. Bellingham, Wash., USA: SPIE, 1995.

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IFIP TC6 Working Conference on Optical Network Design and Modeling (4th 2000 Athens, Greece). New trends in optical network design and modeling: IFIP TC6 Fourth Working Conference on Optical Network Design and Modeling, February 7-8, 2000, Athens, Greece. Boston, MA: Kluwer Academic Publishers, 2001.

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1951-, Senior John M., Cryan Robert A, Qiao Chunming und Society of Photo-optical Instrumentation Engineers., Hrsg. All-optical communication systems: Architecture, control, and network issues III : 2-3 November 1997, Dallas, Texas. Bellingham, Wash., USA: SPIE, 1997.

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8

1956-, Liu Jian, und Wang Zhigong, Hrsg. Fiber optics and optoelectronics for network applications: 7-9 November 2001, Nanjing, China. Bellingham, Wash., USA: SPIE, 2001.

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International, Working Conference on Optical Network Design and Modelling (2nd 1998 Rome Italy). Optical networks: Design and modelling : IFIP TC6 Second International Working Conference on Optical Network Design and Modelling (ONDM '98), February 9-11, 1998, Rome, Italy. Boston: Kluwer Academic, 1999.

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G, Baker Donald. Monomode fiber-optic design with local-area and long-haul network applications. New York: Van Nostrand Reinhold, 1987.

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Buchteile zum Thema "Optical fiber network"

1

Sun, Qizhen, Zhijun Yan, Deming Liu und Lin Zhang. „Optical Fiber Sensor Network and Industrial Applications“. In Handbook of Optical Fibers, 1–46. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-10-1477-2_20-1.

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Sun, Qizhen, Zhijun Yan, Deming Liu und Lin Zhang. „Optical Fiber Sensor Network and Industrial Applications“. In Handbook of Optical Fibers, 1839–84. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-10-7087-7_20.

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Jha, Vikas Kumar, Bishwajeet Pandey und Ciro Rodriguez Rodriguez. „Journey of Cables – From Coppers to Optical Fiber“. In Network Evolution and Applications, 79–98. Boca Raton: CRC Press, 2022. http://dx.doi.org/10.1201/9781003302902-5.

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Mesodiakaki, Agapi, Pavlos Maniotis, Georgios Kalfas, Christos Vagionas, John Vardakas, Elli Kartsakli, Angelos Antonopoulos, Eftychia Datsika, Christos Verikoukis und Nikos Pleros. „A Gated Service MAC Protocol for 5G Fiber-Wireless Cloud-Radio Access Networks“. In Optical Network Design and Modeling, 425–36. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-38085-4_36.

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Jain, Sandesh, Anuj Agrawal, Vimal Bhatia und Shashi Prakash. „Crosstalk Mitigation in Long-Reach Multicore Fiber Communication Systems Using RKHS Based Nonlinear Equalization“. In Optical Network Design and Modeling, 398–411. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-38085-4_34.

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Argyris, Nikos, Giannis Giannoulis, Konstantina Kanta, Panagiotis Toumasis, Dimitrios Apostolopoulos und Hercules Avramopoulos. „12 Gb/s Multiband Fiber-Wireless Link Using Coherent IFoF and V-band mmWave Radio“. In Optical Network Design and Modeling, 437–43. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-38085-4_37.

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Woesner, Hagen. „PrimeNet — A concept to apply Arrayed Waveguide Grating Multiplexers in a WDM-based fiber backbone“. In Optical Network Design and Modelling, 98–106. New York, NY: Springer US, 1998. http://dx.doi.org/10.1007/978-0-387-35361-6_8.

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Awaji, Yoshinari, Hideaki Furukawa, Naoya Wada, Eddie Kong, Peter Chan und Ray Man. „Impact of Transient Response of Erbium-Doped Fiber Amplifier for OPS/WDM and Its Mitigation“. In Optical Network Design and Modeling, 29–37. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-72731-6_4.

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Zhu, Jing, Marija Furdek, Carlos Natalino, Lena Wosinska und Zuqing Zhu. „How to Survive Targeted Fiber Cuts: A Game Theoretic Approach for Resilient SDON Control Plane Design“. In Optical Network Design and Modeling, 168–80. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-38085-4_15.

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Pato, Sílvia, und João Pedro. „Optical Network Architectures for the Support of Future Wireless Systems“. In Next Generation Wireless Communications Using Radio over Fiber, 113–32. Chichester, UK: John Wiley & Sons, Ltd, 2012. http://dx.doi.org/10.1002/9781118306017.ch6.

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Konferenzberichte zum Thema "Optical fiber network"

1

Errea, Javier, Huy Tran Quang, Dominique Verchere, Huu Trung Thieu, Andrea Mazzini, Lahcen Abnaou, Jelena Pesic et al. „Open Disaggregated Optical Network Control with Network Management as Code“. In Optical Fiber Communication Conference. Washington, D.C.: Optica Publishing Group, 2023. http://dx.doi.org/10.1364/ofc.2023.m3z.8.

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Network Management as Code is presented to manage the infrastructure and deployment of control functions in a declarative manner by adopting GitOps in open disaggregated optical networks. We introduce an Automation Engine that analyzes topology changes to trigger the Continuous Delivery procedure of SDN applications on a micro-service architecture.
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2

CHING, YAUCHAU, und FREDERICK A. SAAL. „Synchronous optical networks and network Interfaces“. In Optical Fiber Communication Conference. Washington, D.C.: OSA, 1987. http://dx.doi.org/10.1364/ofc.1987.tun1.

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Marquis, Douglas, Steven G. Finn und Salil A. Parikh. „Network management for all-optical networks“. In Optical Fiber Communication Conference. Washington, D.C.: OSA, 1995. http://dx.doi.org/10.1364/ofc.1995.wo4.

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Xu, Sugang, Kiyo Ishii, Noboru Yoshikane, Subhadeep Sahoo, Sifat Ferdousi, Masaki Shiraiwa, Yusuke Hirota et al. „Enhancement of Network-Cloud Ecosystem Resilience with Openness Disaggregation and Cooperation [Invited]“. In Optical Fiber Communication Conference. Washington, D.C.: Optica Publishing Group, 2023. http://dx.doi.org/10.1364/ofc.2023.m1g.4.

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We investigate the problem of enhancing the resilience of future optical network-cloud ecosystems. We introduce new solutions to build disaster-resilient single-and multi-entity network-cloud ecosystems with openness, disaggregation, and cooperation between networks and clouds.
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5

Bahrani, Sima, Rui Wang, Juan Parra-Ullauri, Romerson D. Oliveira, Reza Nejabati und Dimitra Simeonidou. „Joint Network and Computing Resource Optimisation in Distributed Quantum Computing“. In Optical Fiber Communication Conference. Washington, D.C.: Optica Publishing Group, 2024. http://dx.doi.org/10.1364/ofc.2024.th2a.8.

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We propose an orchestration framework to optimize network and computing resources and minimize degradation from quantum and classical communication in distributed quantum computing interconnect networks.
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Anthony, Bruce. „Network Virtualization & Software Defined Carrier Networks“. In Optical Fiber Communication Conference. Washington, D.C.: OSA, 2013. http://dx.doi.org/10.1364/ofc.2013.om3e.5.

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Karunakaran, Vignesh, Carlos Natalino, Behnam Shariati, Piotr Lechowicz, Johannes Karl Fischer, Achim Autenrieth, Paolo Monti und Thomas Bauschert. „TAPI-based Telemetry Streaming in Multi-domain Optical Transport Network“. In Optical Fiber Communication Conference. Washington, D.C.: Optica Publishing Group, 2024. http://dx.doi.org/10.1364/ofc.2024.m3z.9.

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We demonstrate a TAPI-based telemetry streaming framework for automated service provisioning and monitoring in multi-domain optical networks. The demo show-cases ML-based anomaly detection and network management across domains adhering to recommended YANG and protocol standards.
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Shen, S., H. Li, A. Tyrovolas, Y. Teng, R. Nejabati, S. Yan und D. Simeonidou. „End-to-end QoT Predictions enhanced by GNPy-based Digital Twin with Network Telemetry“. In Optical Fiber Communication Conference. Washington, D.C.: Optica Publishing Group, 2024. http://dx.doi.org/10.1364/ofc.2024.th2a.16.

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Digital twin for dynamic optical networks is implemented using GNPy, network telemetry and databases. It enhances ML-based End-to-End QoT predictions in field trials by supporting model pre-training and minimizing data requirements through the AI engine.
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9

Niu, Wenqing, Fujie Li, Zengyi Xu, Chao Shen, Ziwei Li, Jianyang Shi, Junwen Zhang und Nan Chi. „Wavelength-Multiplexed Beam Steering in Fiber and Visible Light Communication Integrated Indoor Access Network“. In Optical Fiber Communication Conference. Washington, D.C.: Optica Publishing Group, 2024. http://dx.doi.org/10.1364/ofc.2024.tu2k.8.

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We propose a wavelength-multiplexed fiber and VLC integrated access network. Neural networks with a generator-model structure are employed for single-hologram-based wavelength-multiplexed beam steering. A 2 transmission with overall data rate of 4.02 Gbps is demonstrated.
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10

Lam, Cedric F. „Optical Network Technologies for Datacenter Networks“. In National Fiber Optic Engineers Conference. Washington, D.C.: OSA, 2010. http://dx.doi.org/10.1364/nfoec.2010.nwa3.

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Berichte der Organisationen zum Thema "Optical fiber network"

1

Hamdy, Walid M., und Pierre A. Humblet. Crosstalk in Direct-Detection Optical Fiber FDMA Networks. Fort Belvoir, VA: Defense Technical Information Center, August 1991. http://dx.doi.org/10.21236/ada458150.

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2

Tatum, Jim A. VCSELs in MOST Fiber Optic Networks. Warrendale, PA: SAE International, April 2006. http://dx.doi.org/10.4271/2006-01-1663.

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3

Taylor. NR199202 Fiber Optic Fabry-Perot Sensors for Combustion Chamber Monitor. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), September 1992. http://dx.doi.org/10.55274/r0011145.

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Presently, there is no way to continuously measure pressure and temperature in engines over extended periods of operation. Reliable fiber optic sensor networks supplying data to computerized engine control systems could lead to fuel economies in the millions of dollars per year. The goal of this project is to demonstrate the utilization of a new fiber optic sensor technology in engines used for the pumping of natural gas.
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Taylor. L51724 Fiber Optic Pressure Sensor Development. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), Januar 1995. http://dx.doi.org/10.55274/r0010368.

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Fiber optic sensors have been under development in industrial and government laboratories around the world for over a decade The commercial market for fiber sensors for measuring parameters such as temperature, displacement, and liquid level is now estimated to exceed $50 M/year Aside from the commercial interest, the U S. Department of Defense has vigorously pursued the development of fiber gyroscopes and hydrophones In spite of the high level of research and devleopment activity, however, fiber sensors were not successfully applied in the relatively harsh environment of engine combustion chambers prior to 1991. The goal of this development is to demonstrate the utilization of a new fiber optic sensor technology in engines used for natural gas transmission. Presently, there is no way to continuously measure pressure in these engines over extended periods of operation. Reliable fiber optic sensor networks supplying data to computerized control systems for on-line engine balancing could lead to major reductions in the emission of NO, and other harmful combustion products. Fuel economies in the millions of dollars per year for companies in the natural gas transmission industry could also be realized.
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5

Del Guercio, M., G. L. Katulka und S. Fortier. Electronic and Fiber-Optic Applications in Pulsed Power Networks. Fort Belvoir, VA: Defense Technical Information Center, Mai 1994. http://dx.doi.org/10.21236/ada283629.

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Wort, Joshua W. A Network Interface Card for A Bidirectional Wavelength Division Multiplexed Fiber Optic Local Area Network. Fort Belvoir, VA: Defense Technical Information Center, Mai 2005. http://dx.doi.org/10.21236/ada436820.

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Han, I., S. Bond, R. Welty, Y. Du, S. Yoo, C. Reinhardt, E. Behymer, V. Sperry und N. Kobayashi. Secure Communications in High Speed Fiber Optical Networks Using Code Division Multiple Access (CDMA) Transmission. Office of Scientific and Technical Information (OSTI), Februar 2004. http://dx.doi.org/10.2172/15013953.

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Tank, Xiao, Lijun Ma, Alan Mink, Tiejun Chang, Hai Xu, Oliver Slattery, Anastase Nakassis, Barry Hershman, David Su und Ronald F. Boisvert. High-Speed Quantum Key Distribution Systems for Optical Fiber Networks in Campus and Metro Areas. Fort Belvoir, VA: Defense Technical Information Center, Januar 2008. http://dx.doi.org/10.21236/ada506710.

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Wang, Anbo. Embedded Active Fiber Optic Sensing Network for Structural Health Monitoring in Harsh Environments. Office of Scientific and Technical Information (OSTI), September 2016. http://dx.doi.org/10.2172/1406405.

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Garrity, John, und Arndt Husar. Digital Connectivity and Low Earth Orbit Satellite: Constellations Opportunities for Asia and the Pacific. Asian Development Bank, April 2021. http://dx.doi.org/10.22617/wps210156-2.

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Satellite communication plays an important role in the global connectivity ecosystem. It connects rural and remote populations, provides backhaul connectivity to mobile cellular networks, and enables rapid communications for emergency and disaster responses. Low Earth orbit constellations may prove to be transformational to the connectivity landscape based on their global coverage and their suitability for areas not served by fiber optic cable networks. The Asian Development Bank’s developing member countries are well placed to benefit from this expansion of internet connectivity. It will be particularly valuable for small island developing states and landlocked developing countries with limited international bandwidth internet.
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