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Journal articles on the topic 'Optical Coherent Transmission System'

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Author: Grafiati

Published: 14 March 2023

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1

Hodgkinson, T. G., D. W. Smith, R. Wyatt, and D. J. Malyon. "Coherent Optical Fibre Transmission Systems." IETE Journal of Research 32, no. 4 (July 1986): 289–300. http://dx.doi.org/10.1080/03772063.1986.11436609.

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2

Prati, Giancarlo. "Coherent optical FSK transmission systems." European Transactions on Telecommunications 2, no. 2 (March 1991): 227–36. http://dx.doi.org/10.1002/ett.4460020213.

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3

Walker, G. R., R. C. Steele, and N. G. Walker. "Optical amplifier noise figure in a coherent optical transmission system." Journal of Lightwave Technology 8, no. 9 (1990): 1409–13. http://dx.doi.org/10.1109/50.59172.

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4

Hou Baocheng, 侯宝成, and 陈华俊 Chen Huajun. "基于磁光力系统的相干光学传输特性研究." Acta Optica Sinica 41, no. 21 (2021): 2127001. http://dx.doi.org/10.3788/aos202141.2127001.

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5

Levin, I. I., E. A. Semernikov, and D. S. Buriakov. "FPGA-BASED DATA COMMUNICATION SYSTEM IN DIGITAL SIGNAL PROCESSING DEVICES WITH PHASED ANTENNA ARRAYS." Vestnik komp'iuternykh i informatsionnykh tekhnologii, no. 213 (March 2022): 42–50. http://dx.doi.org/10.14489/vkit.2022.03.pp.042-050.

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The paper represents some engineering solutions which provide coherence and coherent data transmission in radar and communication systems with phased array with computing components designed on the principles of FPGA-based reconfigurable computer systems. We developed the coherent gathering methods of digitized data from the phased array antenna elements, and data transmission among the distributed components that perform coherent digital signal processing. To provide coherent data processing and transmission, we use the signal of clock reference signal and the CPU-time, centrally generated and transmitted into all nodes with the same delay. Generation of all control signals in the processing nodes are based on these two signals. For data transmission, we suggest to use high-speed optical links, which are the most reliable in environmental conditions. To transmit the digitized data from phased array antenna elements, we suggested using packet data transmission with data integrity control and time-linked digitized data. Also, we applied a mechanism to monitor the delay mismatch of packets transmitted via different links and to synchronize them in data receivers. The most probable emergency situations for the data transmission system are considered and methods of parrying and minimizing the impact of transmission errors on the formation of the result are proposed. The developed engineering solutions were tested on a real FPGA-based beam-forming device with simulation of emergency situations. Many hours of tests and runs showed that all emergency situations were successfully solved by the data communication system.

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6

Cartledge, John C. "Performance of coherent optical fiber transmission systems." Frontiers of Optoelectronics 11, no. 2 (June 2018): 128–33. http://dx.doi.org/10.1007/s12200-018-0811-3.

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7

Kadhim, Muthanna Ali, Ali Yousif Fattah, and Atheer Alaa Sabri. "Spectral efficiency and performance improvement of coherent optical transmission system." Indonesian Journal of Electrical Engineering and Computer Science 27, no. 1 (July 1, 2022): 290. http://dx.doi.org/10.11591/ijeecs.v27.i1.pp290-300.

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This paper presents an orthogonal frequency division multiplexing (OFDM) for a long-haul optical transmission system with high-rate transferability to alleviate dispersion effects. In addition, we suggest combining polarization division multiplexing (PDM) with coherent OFDM (CO-OFDM) to increase spectral efficiency (SE). Based on OptiSystem (2021) version 18.0" software package, a 100 Gbps single-channel PDM-CO-OFDM transmission system is investigated using different modulation formats; bipolar phase keying (BPSK), quadrature phase shift keying (QPSK), Eight-Phase-Shift Keying modulators (8-PSK), and quadrature amplitude modulation (16-QAM). A 60 km span of standard single-mode fiber (SSMF) cable is employed in this investigation. The system's performance and spectral efficiency have been evaluated by comparing against the different modulation schemes. The outcomes that were got show that the BPSK modulation scheme has the longest transmission distance and requires a lesser level of optical signal to noise ratio (OSNR) at the receiver side. Concerning spectral efficiency, 16-QAM outperforms the others. Farther, the impact of employing ultra-low loss and large effective area fiber in reducing loss and nonlinear effects in the optical channel for 16-QAM modulation formats is examined. The result found that the system with advanced fiber has superior performance than the SSMF. The bit error rate (BER) of 0.033 (20% concatenated forward error correction (FEC) threshold) is used as a baseline.

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8

Kadhim, Muthanna Ali, Ali Yousif Fattah, and Atheer Alaa Sabri. "High-speed multi-channel long-haul coherent optical transmission system." TELKOMNIKA (Telecommunication Computing Electronics and Control) 20, no. 5 (October 1, 2022): 945. http://dx.doi.org/10.12928/telkomnika.v20i5.23454.

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9

Fujiwara, M., S. Suzuki, K. Emura, M. Kondo, K. Manome, I. Mito, K. Kaede, M. Shikada, and M. Sakaguchi. "Photonic space-division switching system utilising coherent optical transmission technologies." Electronics Letters 24, no. 14 (1988): 882. http://dx.doi.org/10.1049/el:19880601.

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10

Zhao, Jian, Yaping Liu, and Tianhua Xu. "Advanced DSP for Coherent Optical Fiber Communication." Applied Sciences 9, no. 19 (October 8, 2019): 4192. http://dx.doi.org/10.3390/app9194192.

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In this paper, we provide an overview of recent progress on advanced digital signal processing (DSP) techniques for high-capacity long-haul coherent optical fiber transmission systems. Not only the linear impairments existing in optical transmission links need to be compensated, but also, the nonlinear impairments require proper algorithms for mitigation because they become major limiting factors for long-haul large-capacity optical transmission systems. Besides the time domain equalization (TDE), the frequency domain equalization (FDE) DSP also provides a similar performance, with a much-reduced computational complexity. Advanced DSP also plays an important role for the realization of space division multiplexing (SDM). SDM techniques have been developed recently to enhance the system capacity by at least one order of magnitude. Some impressive results have been reported and have outperformed the nonlinear Shannon limit of the single-mode fiber (SMF). SDM introduces the space dimension to the optical fiber communication. The few-mode fiber (FMF) and multi-core fiber (MCF) have been manufactured for novel multiplexing techniques such as mode-division multiplexing (MDM) and multi-core multiplexing (MCM). Each mode or core can be considered as an independent degree of freedom, but unfortunately, signals will suffer serious coupling during the propagation. Multi-input–multi-output (MIMO) DSP can equalize the signal coupling and makes SDM transmission feasible. The machine learning (ML) technique has attracted worldwide attention and has been explored for advanced DSP. In this paper, we firstly introduce the principle and scheme of coherent detection to explain why the DSP techniques can compensate for transmission impairments. Then corresponding technologies related to the DSP, such as nonlinearity compensation, FDE, SDM and ML will be discussed. Relevant techniques will be analyzed, and representational results and experimental verifications will be demonstrated. In the end, a brief conclusion and perspective will be provided.

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11

Li, Yu Peng, Yan Gan Zhang, Xue Guang Yuan, Jin Nan Zhang, Ming Lun Zhang, and Yong Qing Huang. "Performance Enhancement of Atmospheric Coherent Optical Communication Systems Using DPSK." Applied Mechanics and Materials 263-266 (December 2012): 1081–84. http://dx.doi.org/10.4028/www.scientific.net/amm.263-266.1081.

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A coherent DPSK transmission system is presented to improve the receiver sensitivity for free space optical (FSO) communication. The coherent DPSK is an effective way to overcome the atmospheric turbulence. The eye diagram and bit error rate (BER) of the system are got by the simulation. Results show that with the coherent reception method, coherent DPSK offers improved signal-to-noise ratio (SNR) performance compared to the DPSK without coherent and OOK format. And hence it can be effective to overcome the signal impairment caused by atmospheric turbulence. It is shown that the sensitivity of the system employing coherent DPSK is 3dB better than a comparable system using DPSK without coherent and 9dB better than a system using OOK.

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12

PEDYASH, Volodymyr. "CHANNEL MODELING OF THE OTH OPTICAL TRANSMISSION SYSTEM WITH QUADRATURE AMPLITUDE MODULATION." Herald of Khmelnytskyi National University. Technical sciences 313, no. 5 (October 27, 2022): 61–65. http://dx.doi.org/10.31891/2307-5732-2022-313-5-61-65.

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The rapid development of services for providing broadband access to the Internet and multimedia content delivery services required the widespread use of fiber optic transmission systems (FOTS) for the transmission of digital traffic. The transmitter signal passes through an optical line, which includes optical fiber and optical amplifiers. In the optical fiber, linear and nonlinear distortions are introduced into the signal, and optical amplifiers generate additive noise of amplified spontaneous emission. In this paper, we develop a model of the optical channel of OTH system with QAM modulation, which takes into account linear and nonlinear distortions of the optical propagation medium and additive noise of the amplified spontaneous radiation of optical amplifiers. To obtain accurate results, the method of simulation modeling was used. The block diagram of the developed model contains a transmitter, an optical line and a coherent receiver of the optical signal. The expression for the time form of the electric field intensity of the optical signal at the transmitter output is given. Modeling of the optical fiber was performed by the split step Fourier method. The noise of the amplified spontaneous emission of optical amplifiers was formed in the frequency domain by means of the Fourier transform operation. The quality of the optical channel was estimated by calculating the average value of the Q-factor of the optical signal at the receiver output. The dependence of the Q-factor from the number of sections of the optical line and the power level of the optical signal was obtained. It is shown that to maximize the quality characteristics of the optical channel, the optimal value of the signal power should be used. The comparison of the obtained results with the data from specialized software products is carried out. Sufficient accuracy of the proposed model was demonstrated. It is recommended to use the developed channel model in the design of new and modernization of existing fragments of networks based on OTH systems with QAM modulation.

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13

Dhawan, Divya, and Neena Gupta. "Performance Analysis of Post Compensated Long Haul High Speed Coherent Optical OFDM System." International Journal of Electrical and Computer Engineering (IJECE) 7, no. 1 (February 1, 2017): 160. http://dx.doi.org/10.11591/ijece.v7i1.pp160-168.

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<p>This paper addresses the performance analysis of OFDM transmission system based on coherent detection over high speed long haul optical links with high spectral efficiency modulation formats such as Quadrature Amplitude Modulation (QAM) as a mapping method prior to the OFDM multicarrier representation. Post compensation is used to compensate for phase noise effects. Coherent detection for signal transmitted at bit rate of 40 Gbps is successfully achieved up to distance of 3200km. Performance is analyzed in terms of Symbol Error Rate and Error Vector Magnitude by varying Optical Signal to Noise Ratio (OSNR) and varying the length of the fiber i.e transmission distance. Transmission performance is also observed through constellation diagrams at different transmission distances and different OSNRs.</p>

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14

Naghshvarianjahromi, Mahdi, Shiva Kumar, and M. Jamal Deen. "Free Space Ground to Satellite Optical Communications Using Kramers–Kronig Transceiver in the Presence of Atmospheric Turbulence." Sensors 22, no. 9 (April 30, 2022): 3435. http://dx.doi.org/10.3390/s22093435.

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Coherent detection provides the optimum performance for free space optical (FSO) communication systems. However, such detection systems are expensive and require digital phase noise compensation. In this paper, the transmission performance of long-haul FSO system for ground-to-satellite communication based on a Kramers–Kronig (KK) transceiver is evaluated. KK transceivers utilize inexpensive direct detection receivers and the signal phase is retrieved from the received current using the well-known KK relations. KK transceivers are not sensitive to the laser phase noise and, hence, inexpensive lasers with large linewidths can be used at the transmitter. The transmission performance of coherent and KK transceivers is compared in various scenarios such as satellite-to-ground, satellite-to-satellite, and ground-to-satellite for weak, moderate, and strong turbulence. The results show that the transmission performance of a system based on the KK transceiver is comparable to that based on a coherent transceiver, but at a significantly lower system cost and complexity. It is shown that in the absence of turbulence, the coherent receiver has a ~3 dB performance advantage over the KK receiver. However, in the presence of strong turbulence, this performance advantage becomes negligible.

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15

Uzunidis, Dimitris, Chris Matrakidis, and Alexandros Stavdas. "Analytical FWM Expressions for Coherent Optical Transmission Systems." Journal of Lightwave Technology 35, no. 13 (July 1, 2017): 2734–40. http://dx.doi.org/10.1109/jlt.2017.2667722.

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16

Zhu, Guijun, Xiukai Ruan, and Zhili Zhou. "Dispersion characteristics and compensation in the POLMUX coherent optical communication system." Modern Physics Letters B 31, no. 19-21 (July 27, 2017): 1740054. http://dx.doi.org/10.1142/s0217984917400541.

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The trend of high-speed optical communication is to realize large capacity, fast speed and long haul transmission. However, the dispersion in an optical fiber link can cause signals distortion or even inter symbol interference (ISI). With increasing signal rate and transmission distance in the optical communication system, the development of high-speed optical fiber communication is restricted seriously. This paper is focusing on the dispersion characteristics and compensation of the polarization multiplexing (POLMUX) coherent optical communication system: (i) to study on dispersion theoretically, e.g., chromatic dispersion (CD), polarization mode dispersion (PMD) and dispersion tolerance; (ii) to analyze and compare the performance of dispersion with various 16-ary modulation formats; (iii) to compensate dispersion by the classical dispersion compensation methods.

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17

Li, Ke, Tianye Huang, Zhong Liu, Qianqian Liu, Yunlei Zhang, Liguo Liu, Lu Li, and Xiang Li. "Simple Noise Mitigation Scheme for Coherent Optical DMT Signal Transmission System." IEEE Access 8 (2020): 166721–29. http://dx.doi.org/10.1109/access.2020.3023048.

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18

Tang, XiongYan, and PeiDa Ye. "Evaluation of dispersions penalty in an optical coherent PSK transmission system." Microwave and Optical Technology Letters 4, no. 6 (May 1991): 227–31. http://dx.doi.org/10.1002/mop.4650040606.

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19

Journal, Baghdad Science. "Comparison between Direct and Coherent Optical Communication System." Baghdad Science Journal 8, no. 2 (June 12, 2011): 479–84. http://dx.doi.org/10.21123/bsj.8.2.479-484.

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The work in this paper focuses on the system quality of direct and coherent communication system for two computers. A system quality is represented by Signal to Noise ratio (SNR) and Bit Error Rate (BER). First part of the work includes implementation of direct optical fiber communication system and measure the system quality .The second part of the work include implementation both the( homodyne and heterodyne)coherent optical fiber communication system and measure the system quality . Laser diode 1310 nm wavelength with its drive circuit used in the transmitter circuit . A single mode of 62.11 km optical fiber is selected as transmission medium . A PIN photo detector is used in the receiver circuit. The optical D-coupler was used to combine the optical signal that come from transmitter laser source with optical signal of laser local oscillator at 1310/1550 nm to obtain coherent detection . Results show that for direct detection the SNR and the BER (28.5 dB, 9.64x10-8,) respectively, while for homodyne and heterodyne coherent detection , the SNR(94.36,97.71)dB and the BER are (1.32x10-22,2.43x10-23) at maximum optical fiber length at 62.11 km. Results show that the homodyne and heterodyne detection are better than direct detection because the large output SNR and low BER of the received signal.

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20

Sifta, Radim, Michal Latal, Petr Munster, and Tomas Horvath. "POL-MUX System for Noncoherent Optical Networks." Applied Sciences 11, no. 12 (June 16, 2021): 5582. http://dx.doi.org/10.3390/app11125582.

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This paper is focused on applying a polarization multiplex to passive optical networks to double their transmission bandwidth without significant changes in the distribution network. Although polarization multiplexes are already employed for high-speed optical transport networks with digital signal processing and coherent detection, we propose a system that could be used in existing older optical networks using a dynamic polarization controller in combination with a wavelength division multiplex.

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21

Journal, Baghdad Science. "Implementation of Optical Coherent Communication System between Two Computers." Baghdad Science Journal 7, no. 1 (March 7, 2010): 41–47. http://dx.doi.org/10.21123/bsj.7.1.41-47.

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This work represents implementation and investigation of optical coherent communication system between two computers. A single mode optical fiber is selected as transmission medium. The data are sent via the RS-232 standard interface with a bit rate of 9.6 kbps from personal computer (PC1) by line receive to convert the data from electrical levels (-12/+12 V) into TTL level (0/5 V). The modulation of this data was accomplished by internal modulation using laser diode type (HFCT-5208M) 1310 nm wavelength. The optical D-coupler was used to combine the optical signal that come from laser source with optical signal of laser local oscillator (OTS-304XI) at 1310/1550 nm wavelength to obtain coherent (homodyne and heterodyne) detection respectively. A PIN photodetector (HFCT-5208M) is used. Calculations of Signal to Noise Ratio (SNR) and Bit Error Rate (BER) for coherent detection were measured at different length of the optical fiber. Result show that high SNR and low BER for heterodyne detection than for homodyne detection.

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22

El-Nahal, Fady. "Coherent 16 Quadrature Amplitude Modulation (16QAM) Optical Communication Systems." Photonics Letters of Poland 10, no. 2 (June 30, 2018): 57. http://dx.doi.org/10.4302/plp.v10i2.809.

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Coherent optical fiber communications for data rates of 100Gbit/s and beyond have recently been studied extensively primarily because high sensitivity of coherent receivers could extend the transmission distance. Spectrally efficient modulation techniques such as M-ary quadrature amplitude modulation (M-QAM) can be employed for coherent optical links. The integration of multi-level modulation formats based on coherent technologies with wavelength-division multiplexed (WDM) systems is key to meet the aggregate bandwidth demand. This paper reviews coherent 16 quadrature amplitude modulation (16QAM) systems to scale the network capacity and maximum reach of current optical communication systems to accommodate traffic growth. Full Text: PDF ReferencesK. Kikuchi, "Fundamentals of Coherent Optical Fiber Communications", J. Lightwave Technol., vol. 34, no. 1, pp. 157-179, 2016. CrossRef S. Tsukamoto, D.-S. Ly-Gagnon, K. Katoh, and K. Kikuchi, "Coherent Demodulation of 40-Gbit/s Polarization-Multiplexed QPSK Signals with16-GHz Spacing after 200-km Transmission", Proc. OFc, Paper PDP29, (2005). DirectLink K. Kikuchi, "Coherent Optical Communication Technology", Proc. OFC, Paper Th4F.4, (2015). CrossRef J. M. Kahn and K.-P. Ho, "Spectral efficiency limits and modulation/detection techniques for DWDM systems", IEEE J. Sel. Topics Quantum Electron., vol. 10, no. 2, pp. 259–272, (2004). CrossRef S. Tsukamoto, K. Katoh, and K. Kikuchi, "Coherent demodulation of optical multilevel phase-shift-keying signals using homodyne detection and digital signal processing", IEEE Photon. Technol. Lett., vol. 18, no. 10, pp. 1131–1133, (2006). CrossRef Y. Mori, C. Zhang, K. Igarashi, K. Katoh, and K. Kikuchi, "Unrepeated 200-km transmission of 40-Gbit/s 16-QAM signals using digital coherent receiver", Opt. Exp., vol. 17, no. 32, pp. 1435–1441, (2009). CrossRef H. Nakashima, Et al., "Digital Nonlinear Compensation Technologies in Coherent Optical Communication Systems", Proc. OFC, Paper W1G.5, (2017). CrossRef S. J. Savory, "Digital filters for coherent optical receivers", Opt. Exp., vol. 16, no. 2, pp. 804–817, (2008). CrossRef D. S. Millar, T. Koike-Akino, S. Ö. Arık, K. Kojima, K. Parsons, T. Yoshida, and T. Sugihara, "High-dimensional modulation for coherent optical communications systems", Opt. Express, vol. 22, no. 7, pp 8798-8812, (2014). CrossRef R. Griffin and A. Carter, "Optical differential quadrature phase-shift key (oDQPSK) for high capacity optical transmission", Proc. OFC, Paper WX6, (2002). DirectLink K. Kikuchi, "Digital coherent optical communication systems: fundamentals and future prospects", IEICE Electron. Exp., vol. 8, no. 20, pp. 1642–1662, (2011). CrossRef F. Derr, "Optical QPSK transmission system with novel digital receiver concept", Electron Lett., vol. 27, no. 23, pp. 2177–2179, (1991). CrossRef R. No’e, "Phase noise tolerant synchronous QPSK receiver concept with digital I&Q baseband processing", Proc. OECC, Paper 16C2-5, (2004). DirectLink D.-S. Ly-Gagnon, S. Tsukamoto, K. Katoh, and K. Kikuchi, "Coherent detection of optical quadrature phase-shift keying signals with carrier phase estimation", J. Lightw. Technol., vol. 24, no. 1, pp. 12–21, (2006). CrossRef M. Taylor, "Coherent detection method using DSP for demodulation of signal and subsequent equalization of propagation impairments", IEEE Photon. Technol. Lett., vol. 16, no. 2, pp. 674–676, (2004). CrossRef S. Tsukamoto, K. Katoh, and K. Kikuchi, "Unrepeated transmission of 20-Gb/s optical quadrature phase-shift-keying signal over 200-km standard single-mode fiber based on digital processing of homodyne-detected signal for Group-velocity dispersion compensation", IEEE Photon. Technol. Lett., vol. 18, no. 9, pp. 1016–1018, (2006). CrossRef S. Tsukamoto, Y. Ishikawa, and K. Kikuchi, "Optical Homodyne Receiver Comprising Phase and Polarization Diversities with Digital Signal Processing", Proc. ECOC, Paper Mo4.2.1, (2006). CrossRef K. Kikuchi and S. Tsukamoto, "Evaluation of Sensitivity of the Digital Coherent Receiver", J. Lightw. Technol., vol. 20, no. 13, pp. 1817–1822, (2008). CrossRef S. Ishimura and K. Kikuchi, "Multi-dimensional Permutation Modulation Aiming at Both High Spectral Efficiency and High Power Efficiency", Proc. OFC/NFOEC, Paper M3A.2, (2014). CrossRef F. I. El-Nahal and A. H. M. Husein, "Radio over fiber access network architecture employing RSOA with downstream OQPSK and upstream re-modulated OOK data", (Optik) Int. J. Light Electron Opt., vol. 123, no. 14, pp: 1301-1303, (2012). CrossRef T. Koike-Akino, D. S. Millar, K. Kojima, and K. Parsons, "Eight-Dimensional Modulation for Coherent Optical Communications", Proc. ECOC, Paper Tu.3.C.3, (2013). DirectLink B. Sklar, Digital communications: Fundamentals and Applications, Prentice-Hall, (2001).

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Walker, G. R., R. C. Steele, and N. G. Walker. "Effect of interfering echoes in a DPSK coherent optical transmission system with optical amplifiers." IEE Proceedings J Optoelectronics 137, no. 4 (1990): 248. http://dx.doi.org/10.1049/ip-j.1990.0042.

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Grosskopf, G., R. Ludwig, and H. G. Weber. "Cascaded inline semiconductor laser amplifiers in a coherent optical fibre transmission system." Electronics Letters 24, no. 9 (1988): 551. http://dx.doi.org/10.1049/el:19880374.

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Noe, R., C. E. Zah, M. Maeda, C. Caneau, S. G. Menocal, R. E. Wagner, and T. P. Lee. "Optical amplifier with 27 dB dynamic range in a coherent transmission system." IEEE Photonics Technology Letters 2, no. 2 (February 1990): 120–21. http://dx.doi.org/10.1109/68.47067.

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Yamazaki, S., T. Ono, H. Shimizu, and K. Emura. "A bidirectional common polarization control method for coherent optical FDM transmission system." IEEE Photonics Technology Letters 2, no. 2 (February 1990): 135–38. http://dx.doi.org/10.1109/68.47072.

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Walker, G. R., R. C. Steele, and N. G. Walker. "Measurement of semiconductor laser amplifier noise figure in coherent optical transmission system." Electronics Letters 25, no. 25 (1989): 1681. http://dx.doi.org/10.1049/el:19891124.

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28

Gafur, Abdul. "Analysis of Nonlinear Signal Interference to Optimize the Coherent Optical Transmission System." IOSR Journal of Electronics and Communication Engineering 12, no. 01 (January 2017): 24–31. http://dx.doi.org/10.9790/2834-1201012431.

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29

Wassin, Shukree, George Isoe, Andrew Leitch, and Tim Gibbon. "Transmission of precise phase coherent optical signals using a VCSEL stabilization system." Optoelectronics Letters 15, no. 3 (May 2019): 200–203. http://dx.doi.org/10.1007/s11801-019-8128-z.

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30

KAWANISHI, Tetsuya. "High-Speed Optical Vector Modulation for Coherent Transmission Systems." Review of Laser Engineering 37, no. 3 (2009): 194–98. http://dx.doi.org/10.2184/lsj.37.194.

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31

Elrefaie, A. F., R. E. Wagner, D. A. Atlas, and D. G. Daut. "Chromatic dispersion limitations in coherent optical fibre transmission systems." Electronics Letters 23, no. 14 (1987): 756. http://dx.doi.org/10.1049/el:19870536.

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32

Zhu, Xianming, and Shiva Kumar. "Nonlinear phase noise in coherent optical OFDM transmission systems." Optics Express 18, no. 7 (March 24, 2010): 7347. http://dx.doi.org/10.1364/oe.18.007347.

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33

Hodgkinson, T. "Receiver analysis for synchronous coherent optical fiber transmission systems." Journal of Lightwave Technology 5, no. 4 (1987): 573–86. http://dx.doi.org/10.1109/jlt.1987.1075536.

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Tajima, K. "Self-amplitude modulation in PSK coherent optical transmission systems." Journal of Lightwave Technology 4, no. 7 (1986): 900–904. http://dx.doi.org/10.1109/jlt.1986.1074818.

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35

Ishihara, K., E. Yamazaki, T. Nakagawa, R. Kudo, T. Kobayashi, and Y. Miyamoto. "Fast chromatic dispersion estimation for coherent optical transmission systems." Electronics Letters 48, no. 20 (2012): 1290. http://dx.doi.org/10.1049/el.2012.2623.

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P., Karrupusamy. "MIMO BASED HIGH SPEED OPTICAL FIBER COMMUNICATION SYSTEM." December 2019 2019, no. 02 (December 29, 2019): 107–16. http://dx.doi.org/10.36548/jei.2019.2.006.

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As the telecommunication services totally relies on the optical fiber for extending communications, it necessary that the optical communication system be capable of handling high speed, multiple channels and long haul signal transmission. recently the emergence of the optical coherent 100 GB/s and the digital signal processing has made possible the perfect signal transmission even for the MIMO (multiple input multiple output system) as they are well reformed to permit multiple wireless signal that holds different carrier frequencies. So the optical fiber system has become prominent among the applications like, large universities, banks and other private networks. However the speed in the transmission of the multiple wireless signals through single cable experiences performance issues in terms of speed, so the proposed method utilizes the 60 GHz, radio over fiber MIMO with effective spectrum allocation and the return zero differential phase shift keying to improve the communication speed and suppress the crosstalk respectively. The proposed system enriches the seamless communication with the QPSK-OFDM MIMO channels achieving 85 % in the data transmission rate, reducing the error correction rate to 5%.

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Hu, Hao, and Leif K. Oxenløwe. "Chip-based optical frequency combs for high-capacity optical communications." Nanophotonics 10, no. 5 (February 3, 2021): 1367–85. http://dx.doi.org/10.1515/nanoph-2020-0561.

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AbstractCurrent fibre optic communication systems owe their high-capacity abilities to the wavelength-division multiplexing (WDM) technique, which combines data channels running on different wavelengths, and most often requires many individual lasers. Optical frequency combs, with equally spaced coherent comb lines derived from a single source, have recently emerged as a potential substitute for parallel lasers in WDM systems. Benefits include the stable spacing and broadband phase coherence of the comb lines, enabling improved spectral efficiency of transmission systems, as well as potential energy savings in the WDM transmitters. In this paper, we discuss the requirements to a frequency comb for use in a high-capacity optical communication system in terms of optical linewidth, per comb line power and optical carrier-to-noise ratio, and look at the scaling of a comb source for ultra-high capacity systems. Then, we review the latest advances of various chip-based optical frequency comb generation schemes and their applications in optical communications, including mode-locked laser combs, spectral broadening of frequency combs, microresonator-based Kerr frequency combs and electro-optic frequency combs.

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Yiping Sun, Yiping Sun, Lixia Xi Lixia Xi, Xianfeng Tang Xianfeng Tang, Donghe Zhao Donghe Zhao, Yaojun Qiao Yaojun Qiao, Xia Zhang Xia Zhang, and Xiaoguang Zhang Xiaoguang Zhang. "Joint estimation of frequency offset and chromatic dispersion based on the training sequences in M-ary QAM coherent optical transmission system." Chinese Optics Letters 12, no. 10 (2014): 100606–9. http://dx.doi.org/10.3788/col201412.100606.

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Wu, Binqi, Jin Lu, Mingyi Gao, Hongliang Ren, Zichun Le, Yali Qin, Shuqin Guo, and Weisheng Hu. "Time-Domain Blind ICI Compensation in Coherent Optical FBMC/OQAM System." Sensors 20, no. 21 (November 9, 2020): 6397. http://dx.doi.org/10.3390/s20216397.

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A blind discrete-cosine-transform-based phase noise compensation (BD-PNC) is proposed to compensate the inter-carrier-interference (ICI) in the coherent optical offset-quadrature amplitude modulation (OQAM)-based filter-bank multicarrier (CO-FBMC/OQAM) transmission system. Since the phase noise sample can be approximated by an expansion of the discrete cosine transform (DCT) in the time-domain, a time-domain compensation model is built for the transmission system. According to the model, phase noise compensation (PNC) depends only on its DCT coefficients. The common phase error (CPE) compensation is firstly performed for the received signal. After that, a pre-decision is made on a part of compensated signals with low decision error probability, and the pre-decision results are used as the estimated values of transmitted signals to calculate the DCT coefficients. Such a partial pre-decision process reduces not only decision error but also the complexity of the BD-PNC method while keeping almost the same performance as in the case of the pre-decision of all compensated signals. Numerical simulations are performed to evaluate the performance of the proposed scheme for a 30 GBaud CO-FBMC/OQAM system. The simulation results show that its bit error rate (BER) performance is improved by more than one order of magnitude through the mitigation of the ICI in comparison with the traditional blind PNC scheme only aiming for CPE compensation.

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Gafur, Abdul, M. S. Islam, and Syed Zahidur Rashid. "Comparison of coherent optical transmission systems performance by DP-QAM levels." International Journal of Electrical and Computer Engineering (IJECE) 10, no. 3 (June 1, 2020): 2513. http://dx.doi.org/10.11591/ijece.v10i3.pp2513-2522.

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In this paper, we investigated the Coherent Optical Transmission System (COTS) performance for multiple types of DP-QAM levels considering various CW laser input power. We compared the performance of COTS for 100 Gb/s with DP-32QAM, DP-64QAM and DP-128QAM respectively. We also inspected the relationship among Optical Signal to Noise Ratio (OSNR), Error Vector Magnitude (EVM) and Bit Error Rate (BER) which are found in accordance for both simulation curves and constellation diagrams. Results are obtained by experiments with DP-32QAM, DP-64QAM and DP-128QAM modulations techniques at symbol rate of 10 Gsymbol/s, 8.33 Gsymbol/s and 7.142 Gsymbol/s respectively. This work is completely based on simulation in Optisystem simulation setup.

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Nehra, Monika, and Deepak Kedia. "Design of Optical I/Q Modulator Using Dual-drive Mach-Zehnder Modulators in Coherent Optical-OFDM System." Journal of Optical Communications 39, no. 2 (April 25, 2018): 155–59. http://dx.doi.org/10.1515/joc-2016-0089.

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AbstractA CO-OFDM system combines the advantages of both coherent detection and OFDM modulation for future high speed fiber transmission. In this paper, we propose an I/Q modulation technique using dual-drive MZMs for high rate 10 Gb/s CO-OFDM system. The proposed modulator provides 10.63 dBm improved optical spectra compared to a single dual-drive MZM. The simulation results in terms of BER and Q factor are quite satisfactory upto a transmission reach of 3,000 km and that to without making use of any dispersion compensation. A BER of about 8.03×10−10and 15.06 dB Q factor have been achieved at −10.43 dBm received optical power.

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Jiang, Q., D. M. Wu, and L. Z. Xie. "Two-channel coherent optical FDM transmission system with a new frequency stabilisation scheme." Electronics Letters 26, no. 5 (1990): 310. http://dx.doi.org/10.1049/el:19900204.

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Giacoumidis, Elias, Yi Lin, Mutsam Jarajreh, Sean O’Duill, Kevin McGuinness, Paul F. Whelan, and Liam P. Barry. "A Blind Nonlinearity Compensator Using DBSCAN Clustering for Coherent Optical Transmission Systems." Applied Sciences 9, no. 20 (October 17, 2019): 4398. http://dx.doi.org/10.3390/app9204398.

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Coherent fiber-optic communication systems are limited by the Kerr-induced nonlinearity. Benchmark optical and digital nonlinearity compensation techniques are typically complex and tackle deterministic-induced nonlinearities. However, these techniques ignore the impact of stochastic nonlinear distortions in the network, such as the interaction of fiber nonlinearity with amplified spontaneous emission from optical amplification. Unsupervised machine learning clustering (e.g., K-means) has recently been proposed as a practical approach to the blind compensation of stochastic and deterministic nonlinear distortions. In this work, the Density-Based Spatial Clustering of Applications with Noise (DBSCAN) algorithm is employed, for the first time, for blind nonlinearity compensation. DBSCAN is tested experimentally in a 40 Gb/s 16 quadrature amplitude-modulated system at 50 km of standard single-mode fiber transmission. It is shown that at high launched optical powers, DBSCAN can offer up to 0.83 and 8.84 dB enhancement in Q-factor when compared to conventional K-means clustering and linear equalisation, respectively.

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ISHIHARA, Koichi, Takayuki KOBAYASHI, Riichi KUDO, Yasushi TAKATORI, Akihide SANO, and Yutaka MIYAMOTO. "Frequency-Domain Equalization for Coherent Optical Single-Carrier Transmission Systems." IEICE Transactions on Communications E92.B, no. 12 (2009): 3736–43. http://dx.doi.org/10.1587/transcom.e92.b.3736.

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Bao, Hongchun, and William Shieh. "Transmission simulation of coherent optical OFDM signals in WDM systems." Optics Express 15, no. 8 (2007): 4410. http://dx.doi.org/10.1364/oe.15.004410.

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Xu, Yanfei, Yaojun Qiao, and Yuefeng Ji. "Characteristics of XPM in coherent optical OFDM WDM transmission systems." Optics Communications 297 (June 2013): 113–17. http://dx.doi.org/10.1016/j.optcom.2013.01.057.

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Zhou, Xinyu. "Machine-Learning-Assisted Optical Fiber Communication System." Highlights in Science, Engineering and Technology 27 (December 27, 2022): 630–38. http://dx.doi.org/10.54097/hset.v27i.3826.

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With the development of software-defined networking and coherent transmission, to name only a couple of emerging technical and technological areas, optical networks have rapidly expanded during the past few years. To handle with the enormous increment, several sections of optical transmission networks have been addressed via machine learning. Techniques such as support vector machine and KNN algorithms are widely used in fiber-induced nonlinear mitigation, which can cause enormous financial loses if the problem is not solved properly. Optical performance monitoring is another essential area in optical networks, which often adopts multitasking, while failure management, where anomaly detection takes place, rely on both supervised and unsupervised learning methods. The overview includes a brief synopsis of four types of learning methods, including supervised learning, unsupervised learning, semi-supervised learning and reinforcement, as well as the most recent advancements in methodologies used in optical fibre communication. At the end of the analysis, it is demonstrated that ML algorithms are selected based on the challenges present and we have to consider multiple factors when choosing a suitable algorithm. The combination of the two fields brings prosperity to each other.

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Wu, Zhenhua, Zhen Yi, Wenju Gu, Lihui Sun, and Zbigniew Ficek. "Enhancement of Optomechanical Squeezing of Light Using the Optical Coherent Feedback." Entropy 24, no. 12 (November 29, 2022): 1741. http://dx.doi.org/10.3390/e24121741.

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A coherent feedback scheme is used to enhance the degree of squeezing of the output field in a cavity optomechanical system. In the feedback loop, a beam splitter (BS) plays the roles of both a feedback controller and an input–output port. To realize effective enhancement, the output quadrature should take the same form as the input quadrature, and the system should operate at the deamplification situation in the meantime. This can be realized by choosing an appropriate frequency-dependent phase angle for the generalized quadrature. Additionally, both the transmissivity of the BS and the phase factor induced by time delays in the loop affect optical squeezing. For the fixed frequency, the optimal values of transmissivity and phase factor can be used to achieve the enhanced optical squeezing. The effect of optical losses on squeezing is also discussed. Optical squeezing is degraded by the introduced vacuum noise owing to the inefficient transmission in the loop. We show that the enhancement of squeezing is achievable with the parameters of the current experiments.

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Tajima, K. "Bandwidth of a single-mode optical fiber in PSK coherent optical transmission systems." Journal of Lightwave Technology 6, no. 2 (1988): 322–28. http://dx.doi.org/10.1109/50.4006.

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Yang, Xiaokun, Xiangqing Wang, Dongfei Wang, Lan Zhang, Zufang Yang, Han Zhu, and Baohong Wu. "Combined Optical Fiber Transmission System Based on QNSC and BER-LM." Photonics 10, no. 2 (February 2, 2023): 154. http://dx.doi.org/10.3390/photonics10020154.

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A quantum noise stream cipher (QNSC) is a physical layer encryption technology based on quantum noise. Bit error rate loopback measurement (BER-LM) is a method to measure the BER of a loopback channel and extract channel characteristics. Then, channel characteristics can be extracted, and consensus keys can be obtained through negotiation. In previous studies, encryption and key distribution were implemented in independent channels. In this paper, we propose a scheme that combines these two technologies in a single fiber channel to achieve encrypted transmission and key distribution. We verified a 20 Gbps QPSK coherent optical transmission system with a PSK/QNSC scheme. The results show that by reasonably setting the negotiation bit position, the consensus key could be obtained through negotiation, and the requirements of transmission performance could be met. When the negotiation bit position was set to seven, the Q-factor of the system was nine, which met the error-free condition of the 7% forward error correction (FEC) limit.

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