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Investigation Of Digital Signal Processing Techniques For Compensation Of Linear And Nonlinear Impairments In Fiber Optic Communication Systems
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Book Synopsis Investigation of Digital Signal Processing Techniques for Compensation of Linear and Nonlinear Impairments in Fiber-Optic Communication Systems by : Roi Rath
Download or read book Investigation of Digital Signal Processing Techniques for Compensation of Linear and Nonlinear Impairments in Fiber-Optic Communication Systems written by Roi Rath and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Impact of Nonlinearities on Fiber Optic Communications by : Shiva Kumar
Download or read book Impact of Nonlinearities on Fiber Optic Communications written by Shiva Kumar and published by Springer Science & Business Media. This book was released on 2011-03-23 with total page 547 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers the recent progress in fiber-optic communication systems with a main focus on the impact of fiber nonlinearities on the system performance. Over the past few years, there has been significant progress in coherent communication systems mainly because of the advances in digital signal processing techniques. This has led to renewed interest in fiber linear and nonlinear impairments and techniques to mitigate them in electrical domain. In this book, the reader will find all the important topics of fiber optic communication systems in one place with in-depth coverage by the experts of each subtopics. Pioneers from each of the sub-topics have been invited to contribute. Each chapter will have a section on fundamentals, review of literature survey and the recent developments. The reader will benefit from this approach since many of the conference proceedings and journal articles mainly focus on the authors’ research work without spending space on preliminaries.
Book Synopsis Digital Signal Processing In High-Speed Optical Fiber Communication Principle and Application by : Jianjun Yu
Download or read book Digital Signal Processing In High-Speed Optical Fiber Communication Principle and Application written by Jianjun Yu and published by Springer Nature. This book was released on 2020-07-06 with total page 572 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the principles and applications of optical fiber communication based on digital signal processing (DSP) for both single and multi-carrier modulation signals. In the context of single carrier modulation, it describes DSP for linear and nonlinear optical fiber communication systems, discussing all-optical Nyquist modulation signal generation and processing, and how to use probabilistic and geometrical shaping to improve the transmission performance. For multi-carrier modulation, it examines DSP-based OFDM signal generation and detection and presents 4D and high-order modulation formats. Lastly, it demonstrates how to use artificial intelligence in optical fiber communication. As such it is a useful resource for students, researches and engineers in the field of optical fiber communication.
Book Synopsis Optical Fiber Telecommunications VIB by : Polina Bayvel
Download or read book Optical Fiber Telecommunications VIB written by Polina Bayvel and published by Elsevier Inc. Chapters. This book was released on 2013-05-11 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt: The key question of current optical communications research is: how to maximize both capacity and transmission distance in future optical transmission networks by using spectrally-efficient modulation formats with coherent detection, and how can digital signal processing aid in this quest? There is a clear trade-off between spectral efficiency and transmission distance, since the more spectrally-efficient modulation formats are also more susceptible to optical fiber nonlinearities. This chapter illustrates the application of nonlinear backpropagation to mitigate for both linear and nonlinear transmission impairments for a range of modulation formats, at varying symbol-rates and wavelength spacings, and also by varying the signal bandwidth which is backpropagated. The basics of coherent receiver structure and DSP algorithms for chromatic dispersion compensation, equalization and phase recovery of PDM-BPSK, PS-QPSK, PDM-QPSK, PDM-8PSK, PDM-8QAM, and PDM-16QAM are reviewed and the effectiveness of the nonlinearity compensating DSP based on digital backpropagation is explored. This chapter includes a comprehensive literature review of the key experimental demonstrations of nonlinearity-compensating DSP.
Book Synopsis Adaptive Compensation of Nonlinear Impairments in Fiber-Optic Systems by : Hadi NekoeiQachkanloo
Download or read book Adaptive Compensation of Nonlinear Impairments in Fiber-Optic Systems written by Hadi NekoeiQachkanloo and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Optical communication systems are vital for high rate telecommunication. Fiber-optic communication system is an excellent choice due to its low loss, high bandwidth, and robustness to electromagnetic interference. However, fiber-optic links suffer from linear and nonlinear impairments which limit their performance. Digital signal processing techniques can be used for linear impairments compensation. On the other hand, nonlinear impairment is much harder to tackle. There exist two main nonlinear noise which is caused by Kerr effect. Each channel in the fiber-optic link has two poles namely X-pole and Y-pole. In a single channel case, transmitted signal over each pole generates intensity-dependent noise on both poles which is called Self Phase Modulation (SPM) noise. On the other hand, when multiple signal channels co-propagate in a single fiber, the power fluctuations of one signal channel cause a phase shift to another channel, which is due to the Cross Phase Modulation (XPM) effect. Through this thesis, our main contributions are as follows. Firstly, we utilize Low-density parity-check (LDPC) Coded Modulation with Iterative Damping and Decoding at the receiver to overcome the nonlinear noise without any need for feedback to the transmitter. In other words, after extracting the short-term mean of SPM noise, we modify the decoding system to accept a priori information which helps us to remove nonlinearity using demapping. In addition, we propose a joint detection method to compensate for SPM noise. In this method, we exploit two main statistical characteristics of noise samples which are space domain and time domain correlations to improve naive minimum distance detection. In the last chapter, we introduce an algorithm for learning an adaptive model of fiber which can help us not only improve the performance of pre-compensation but also reduce the complexity of the state-of-the-art method.
Book Synopsis Digital Signal Processing for Cancellation of Fiber Optic Impairments by : Zainab Faydh Mohammed
Download or read book Digital Signal Processing for Cancellation of Fiber Optic Impairments written by Zainab Faydh Mohammed and published by LAP Lambert Academic Publishing. This book was released on 2013 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: High bit rates optical communication systems pose the challenge of their tolerance to linear and nonlinear fiber impairments. Recently, the use of electronic processing for the mitigation of signal distortion in optical communication has attracted increasing interest due to its low cost and size relative to alternative optical techniques and the potential for the integration of electronic processors with existing transceiver electronics. In this book 40 Gb/s DP-QPSK system with coherent reception and DSP unit for optical fiber impairments compensation is proposed . The Chromatic Dispersion is compensated using a simple transversal digital filter and Polarization Mode Dispersion is compensated using adaptive butterfly equalizer. A nonlinear compensator is used for compensating the nonlinear effects. A modified Viterbi-and-Viterbi algorithm is then used to compensate for phase and frequency mismatch between the transmitter and local oscillator .This book should be useful for researchers work on development of optical communication systems and especially who works on DSP algorithms or anyone else who may be interested in optical fiber technology.
Book Synopsis Enabling Technologies for High Spectral-efficiency Coherent Optical Communication Networks by : Xiang Zhou
Download or read book Enabling Technologies for High Spectral-efficiency Coherent Optical Communication Networks written by Xiang Zhou and published by John Wiley & Sons. This book was released on 2016-04-29 with total page 719 pages. Available in PDF, EPUB and Kindle. Book excerpt: Enabling Technologies for High Spectral-efficiency Coherent Optical Communication Networks Presents the technological advancements that enable high spectral-efficiency and high-capacity fiber-optic communication systems and networks This book examines key technology advances in high spectral-efficiency fiber-optic communication systems and networks, enabled by the use of coherent detection and digital signal processing (DSP). The first of this book’s 16 chapters is a detailed introduction. Chapter 2 reviews the modulation formats, while Chapter 3 focuses on detection and error correction technologies for coherent optical communication systems. Chapters 4 and 5 are devoted to Nyquist-WDM and orthogonal frequency-division multiplexing (OFDM). In chapter 6, polarization and nonlinear impairments in coherent optical communication systems are discussed. The fiber nonlinear effects in a non-dispersion-managed system are covered in chapter 7. Chapter 8 describes linear impairment equalization and Chapter 9 discusses various nonlinear mitigation techniques. Signal synchronization is covered in Chapters 10 and 11. Chapter 12 describes the main constraints put on the DSP algorithms by the hardware structure. Chapter 13 addresses the fundamental concepts and recent progress of photonic integration. Optical performance monitoring and elastic optical network technology are the subjects of Chapters 14 and 15. Finally, Chapter 16 discusses spatial-division multiplexing and MIMO processing technology, a potential solution to solve the capacity limit of single-mode fibers. Contains basic theories and up-to-date technology advancements in each chapter Describes how capacity-approaching coding schemes based on low-density parity check (LDPC) and spatially coupled LDPC codes can be constructed by combining iterative demodulation and decoding Demonstrates that fiber nonlinearities can be accurately described by some analytical models, such as GN-EGN model Presents impairment equalization and mitigation techniques Enabling Technologies for High Spectral-efficiency Coherent Optical Communication Networks is a reference for researchers, engineers, and graduate students.
Book Synopsis Digital Signal Processing Techniques for Fiber Nonlinearity Compensation in Coherent Optical Communication Systems by : O. S. Sunish Kumar
Download or read book Digital Signal Processing Techniques for Fiber Nonlinearity Compensation in Coherent Optical Communication Systems written by O. S. Sunish Kumar and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The capacity of long-haul coherent optical communication systems is limited by the detrimental effects of fiber Kerr nonlinearity. The power-dependent nature of the Kerr nonlinearity restricts the maximum launch power into the fiber. That results in the reduction of the optical signal-to-noise ratio at the receiver; thereby, the maximum transmission reach is limited. Over the last few decades, several digital signal processing (DSP) techniques have been proposed to mitigate the effects of fiber nonlinearity, for example, digital back-propagation (DBP), perturbation based nonlinearity compensation (PB-NLC), and phase-conjugated twin wave (PCTW). However, low-complexity and spectrally efficient DSP-based fiber nonlinearity mitigation schemes for long-haul transmission systems are yet to be developed. In this thesis, we focus on the computationally efficient DSP-based techniques that can help to combat various sources of fiber nonlinearity in long-haul coherent optical communication systems. With this aim, we propose a linear time/polarization coded digital phase conjugation (DPC) technique for the mitigation of fiber nonlinearity that doubles the spectral efficiency obtained in the PCTW technique. In addition, we propose to investigate the impact of random polarization effects, like polarization-dependent loss and polarization mode dispersion, on the performance of the linear-coded DPC techniques. We also propose a joint technique that combines single-channel DBP with the PCTW technique. We show that the proposed scheme is computationally efficient and achieves similar performance as multi-channel DBP in wavelength division multiplexed superchannel systems. The regular perturbation (RP) series used to analytically approximate the solution of the nonlinear Schrödinger equation (NLSE) has a serious energy divergence problem when truncated to the first-order. Recent results on the transmission of high data-rate optical signals reveal that the nonlinearity compensation performance of the first-order PB-NLC technique decreases as the product of the transmission distance and launch power increases. The enhanced RP (ERP) method can improve the accuracy of the first-order RP approximation by partially solving the energy divergence problem. On this ground, we propose an ERP-based nonlinearity compensation technique to compensate for the fiber nonlinearity in a polarization-division multiplexed dispersion unmanaged optical communication system. Another possible solution to improve the accuracy of the PB-NLC technique is to increase the order of the RP solution. Based on this idea, we propose to extend the first-order solution of the NLSE to the second-order to improve the nonlinearity compensation performance of the PB-NLC technique. Following that, we investigate a few simplifying assumptions to reduce the implementation complexity of the proposed second-order PB-NLC technique.
Book Synopsis Chapter Digital Signal Processing for Optical Communications and Networks by : Tianhua Xu
Download or read book Chapter Digital Signal Processing for Optical Communications and Networks written by Tianhua Xu and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The achievable information rates of optical communication networks have been widely increased over the past four decades with the introduction and development of optical amplifiers, coherent detection, advanced modulation formats, and digital signal processing techniques. These developments promoted the revolution of optical communication systems and the growth of Internet, towards the direction of high-capacity and long-distance transmissions. The performance of long-haul high-capacity optical fiber communication systems is significantly degraded by transmission impairments, such as chromatic dispersion, polarization mode dispersion, laser phase noise and Kerr fiber nonlinearities. With the entire capture of the amplitude and phase of the signals using coherent optical detection, the powerful compensation and effective mitigation of the transmission impairments can be implemented using the digital signal processing in electrical domain. This becomes one of the most promising techniques for next-generation optical communication networks to achieve a performance close to the Shannon capacity limit. This chapter will focus on the introduction and investigation of digital signal processing employed for channel impairments compensation based on the coherent detection of optical signals, to provide a roadmap for the design and implementation of real-time optical fiber communication systems.
Book Synopsis Advanced Digital Signal Processing in Coherent Fiber Optic Communication Systems by : Mahdi Malekiha
Download or read book Advanced Digital Signal Processing in Coherent Fiber Optic Communication Systems written by Mahdi Malekiha and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "To satisfy the explosive growth in global Internet traffic, the development of transmission links that not only have high-capacity but are also flexible, reconfigurable, and adaptive is imperative. The advents of high speed digital-to-analog and analog-to-digital converters, and recent progress in complementary metal-oxide-semiconductor (CMOS) technology has facilitated the development of optical transceivers relying on coherent detection and digital signal processing (DSP) for the compensation of fiber impairments. Next generation coherent optical networks are anticipated to further approach the Shannon limit and deliver 400~Gb/s or 1~Tb/s data rates per channel, while providing flexibility and agility to maximize the utilization of the network resources. This thesis explores novel system architectures and advanced DSP algorithms to fulfill these design targets. Currently, chromatic dispersion (CD) compensation and forward error correction (FEC) decoders are the major power consuming (more than 50%) blocks of a conventional transceiver application-specific integrated circuit (ASIC). This thesis presents the concepts and architectures of multi-sub-band (MSB) signaling for mitigation of CD, and eliminating the need for a CD compensating equalizer in reduced-guard-interval (RGI) orthogonal frequency-division multiplexing (OFDM) and single carrier systems. The performance of the proposed techniques are experimentally evaluated using a leading-edge optical long-haul transmission test-bed. It is shown that the MSB technique, in addition to the evidently lower computational complexity, allows for a highly efficient adaptive rate smart transceiver implementation with lower system overhead and simplified parallelism, while attaining the same or better transmission reach and performance as the conventional transceiver. This is due to its higher tolerance to fiber nonlinearity.With coherent technology and advanced FEC, it is known that the capacity of current fiber optic transmission systems is fundamentally limited by fiber nonlinearities. We have optimized the perturbation based nonlinearity compensation (PB-NLC) equalization scheme and proposed a novel adaptive nonlinear equalizer. The performances of the aforementioned DSP equalization schemes are numerically and experimentally studied. It is found that the optimized technique demonstrates lower computational complexity over conventional PB-NLC. In addition, the proposed adaptive nonlinear equalizer does not require prior calculations of perturbation coefficients and detailed knowledge of the transmission link parameters. It achieves comparable performance to the PB-NLC. Unlike previously studied adaptive nonlinear equalization techniques, our algorithm takes advantage of common symmetries, avoids replication of operations, and only uses a few adaptive nonlinear coefficients. Finally, its computational complexity is smaller than previously proposed adaptive nonlinear equalization schemes, which meets the requirements of next generation optical networks." --
Book Synopsis Digital Signal Processing for Optical Communications and Networks by : Tianhua Xu
Download or read book Digital Signal Processing for Optical Communications and Networks written by Tianhua Xu and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The achievable information rates of optical communication networks have been widely increased over the past four decades with the introduction and development of optical amplifiers, coherent detection, advanced modulation formats, and digital signal processing techniques. These developments promoted the revolution of optical communication systems and the growth of Internet, towards the direction of high-capacity and long-distance transmissions. The performance of long-haul high-capacity optical fiber communication systems is significantly degraded by transmission impairments, such as chromatic dispersion, polarization mode dispersion, laser phase noise and Kerr fiber nonlinearities. With the entire capture of the amplitude and phase of the signals using coherent optical detection, the powerful compensation and effective mitigation of the transmission impairments can be implemented using the digital signal processing in electrical domain. This becomes one of the most promising techniques for next-generation optical communication networks to achieve a performance close to the Shannon capacity limit. This chapter will focus on the introduction and investigation of digital signal processing employed for channel impairments compensation based on the coherent detection of optical signals, to provide a roadmap for the design and implementation of real-time optical fiber communication systems.
Book Synopsis Advanced Digital Optical Communications by : Le Nguyen Binh
Download or read book Advanced Digital Optical Communications written by Le Nguyen Binh and published by CRC Press. This book was released on 2017-11-22 with total page 937 pages. Available in PDF, EPUB and Kindle. Book excerpt: This second edition of Digital Optical Communications provides a comprehensive treatment of the modern aspects of coherent homodyne and self-coherent reception techniques using algorithms incorporated in digital signal processing (DSP) systems and DSP-based transmitters to overcome several linear and nonlinear transmission impairments and frequency mismatching between the local oscillator and the carrier, as well as clock recovery and cycle slips. These modern transmission systems have emerged as the core technology for Tera-bits per second (bps) and Peta-bps optical Internet for the near future. Featuring extensive updates to all existing chapters, Advanced Digital Optical Communications, Second Edition: Contains new chapters on optical fiber structures and propagation, optical coherent receivers, DSP equalizer algorithms, and high-order spectral DSP receivers Examines theoretical foundations, practical case studies, and MATLAB® and Simulink® models for simulation transmissions Includes new end-of-chapter practice problems and useful appendices to supplement technical information Downloadable content available with qualifying course adoption Advanced Digital Optical Communications, Second Edition supplies a fundamental understanding of digital communication applications in optical communication technologies, emphasizing operation principles versus heavy mathematical analysis. It is an ideal text for aspiring engineers and a valuable professional reference for those involved in optics, telecommunications, electronics, photonics, and digital signal processing.
Book Synopsis Odyssey of Light in Nonlinear Optical Fibers by : Kuppuswamy Porsezian
Download or read book Odyssey of Light in Nonlinear Optical Fibers written by Kuppuswamy Porsezian and published by CRC Press. This book was released on 2017-12-19 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt: Odyssey of Light in Nonlinear Optical Fibers: Theory and Applications presents a collection of breakthrough research portraying the odyssey of light from optical solitons to optical rogue waves in nonlinear optical fibers. The book provides a simple yet holistic view on the theoretical and application-oriented aspects of light, with a special focus on the underlying nonlinear phenomena. Exploring the very frontiers of light-wave technology, the text covers the basics of nonlinear fiberoptics and the dynamics of electromagnetic pulse propagation in nonlinear waveguides. It also highlights some of the latest advances in nonlinear optical fiber technology, discussing hidden symmetry reductions and Ablowitz–Kaup–Newell–Segur (AKNS) hierarchies for nonautonomous solitons, state-of-the-art Brillouin scattering applications, backpropagation, and the concept of eigenvalue communication—a powerful nonlinear digital signal processing technique that paves the way to overcome the current limitations of traditional communications methods in nonlinear fiber channels. Key chapters study the feasibility of the eigenvalue demodulation scheme based on digital coherent technology by throwing light on the experimental study of the noise tolerance of the demodulated eigenvalues, investigate matter wave solitons and other localized excitations pertaining to Bose–Einstein condensates in atom optics, and examine quantum field theory analogue effects occurring in binary waveguide arrays, plasmonic arrays, etc., as well as their ensuing nonlinear wave propagation. Featuring a foreword by Dr. Akira Hasegawa, the father of soliton communication systems, Odyssey of Light in Nonlinear Optical Fibers: Theory and Applications serves as a curtain raiser to usher in the photonics era. The technological innovations at the core of the book form the basis for the next generation of ultra-high speed computers and telecommunication devices.
Book Synopsis Advanced Digital Filtering Techniques for Mitigation of Linear and Nonlinear Impairments in Coherent Optical Transmission Systems by : Xian Xu
Download or read book Advanced Digital Filtering Techniques for Mitigation of Linear and Nonlinear Impairments in Coherent Optical Transmission Systems written by Xian Xu and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "Enabled by coherent detection and advanced digital signal processing techniques, next generation optical networks embrace such characteristics as ultra high capacity, ultra long transmission reach, agile yet cost-effective. Digital linear filtering is an indispensable technique that facilitates the advancement of coherent optical transmission systems. Currently, most digital linear filtering techniques are employed for mitigation or compensation for linear impairments, such as chromatic dispersion compensation, channel equalization and spectrally efficient pulse shaping. This thesis explores the potential of digital linear filtering techniques for mitigating both linear and nonlinear impairments in the fiber-optic transmissions.Polarization division multiplexed (PDM) high order quadrature amplitude modulation (QAM) provides a spectrally efficient solution for coherent optical transmission systems. PDM technique uses blind equalizers for polarization demultiplexing. We propose the decision directed least radius distance (DD LRD) blind equalizer for coherent optical transmission systems. Compared to other equalizers, the DD-LRD equalizer is found to have good steady state bit error rate (BER), better tolerance to high speed polarization rotation, excellent inter symbol interference (ISI) tolerance and less sensitivity to initial conditions. Pulse shaping is traditionally utilized for increasing spectral efficiency. We propose a new family of pulses, called frequency domain root M-shape pulses (RMP), to mitigate Kerr nonlinearity in the fiber channel. Experimental and simulation demonstrations reveal that compared to the widely used root raised cosine (RRC) pulses, the RMP can significantly extend the transmission reach in standard single mode fiber based dispersion unmanaged links and most legacy links using various fiber types and dispersion maps. The enhanced nonlinearity tolerance of the RMP is attributed to the fact that the RMP put more energy contents in their higher spectral components and disperse faster in a dispersive medium. In comparison with other nonlinearity mitigation or compensation algorithms, the RMP filtering technique embraces the following advantages for next generation optical networks: computationally efficient, link configuration independent and modulation format transparent." --
Book Synopsis Signal Processing Techniques for Power Efficient Wireless Communication Systems by : Fernando Gregorio
Download or read book Signal Processing Techniques for Power Efficient Wireless Communication Systems written by Fernando Gregorio and published by Springer Nature. This book was released on 2019-11-23 with total page 269 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a synthesis of the research carried out in the Laboratory of Signal Processing and Communications (LaPSyC), CONICET, Universidad Nacional del Sur, Argentina, since 2003. It presents models and techniques widely used by the signal processing community, focusing on low-complexity methodologies that are scalable to different applications. It also highlights measures of the performance and impact of each compensation technique. The book is divided into three parts: 1) basic models 2) compensation techniques and 3) applications in advanced technologies. The first part addresses basic architectures of transceivers, their component blocks and modulation techniques. It also describes the performance to be taken into account, regardless of the distortions that need to be compensated. In the second part, several schemes of compensation and/or reduction of imperfections are explored, including linearization of power amplifiers, compensation of the characteristics of analog-to- digital converters and CFO compensation for OFDM modulation. The third and last part demonstrates the use of some of these techniques in modern wireless-communication systems, such as full-duplex transmission, massive MIMO schemes and Internet of Things applications.
Book Synopsis Advanced Digital Optical Communications by : Le Nguyen Binh
Download or read book Advanced Digital Optical Communications written by Le Nguyen Binh and published by CRC Press. This book was released on 2017-11-22 with total page 1341 pages. Available in PDF, EPUB and Kindle. Book excerpt: This second edition of Digital Optical Communications provides a comprehensive treatment of the modern aspects of coherent homodyne and self-coherent reception techniques using algorithms incorporated in digital signal processing (DSP) systems and DSP-based transmitters to overcome several linear and nonlinear transmission impairments and frequency mismatching between the local oscillator and the carrier, as well as clock recovery and cycle slips. These modern transmission systems have emerged as the core technology for Tera-bits per second (bps) and Peta-bps optical Internet for the near future. Featuring extensive updates to all existing chapters, Advanced Digital Optical Communications, Second Edition: Contains new chapters on optical fiber structures and propagation, optical coherent receivers, DSP equalizer algorithms, and high-order spectral DSP receivers Examines theoretical foundations, practical case studies, and MATLAB® and Simulink® models for simulation transmissions Includes new end-of-chapter practice problems and useful appendices to supplement technical information Downloadable content available with qualifying course adoption Advanced Digital Optical Communications, Second Edition supplies a fundamental understanding of digital communication applications in optical communication technologies, emphasizing operation principles versus heavy mathematical analysis. It is an ideal text for aspiring engineers and a valuable professional reference for those involved in optics, telecommunications, electronics, photonics, and digital signal processing.
Book Synopsis Digital Signal Processing Techniques for Coherent Optical Communication by : Gilad Goldfarb
Download or read book Digital Signal Processing Techniques for Coherent Optical Communication written by Gilad Goldfarb and published by . This book was released on 2008 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: Coherent detection with subsequent digital signal processing (DSP) is developed, analyzed theoretically and numerically and experimentally demonstrated in various fiber-optic transmission scenarios. The use of DSP in conjunction with coherent detection unleashes the benefits of coherent detection which rely on the preservation of full information of the incoming field. These benefits include high receiver sensitivity, the ability to achieve high spectral-efficiency and the use of advanced modulation formats. With the immense advancements in DSP speeds, many of the problems hindering the use of coherent detection in optical transmission systems have been eliminated. Most notably, DSP alleviates the need for hardware phase-locking and polarization tracking, which can now be achieved in the digital domain. The complexity previously associated with coherent detection is hence significantly diminished and coherent detection is once again considered a feasible detection alternative. In this thesis, several aspects of coherent detection (with or without subsequent DSP) are addressed. Coherent detection is presented as a means to extend the dispersion limit of a duobinary signal using an analog decision-directed phase-lock loop. Analytical bit-error ratio estimation for quadrature phase-shift keying signals is derived. To validate the promise for high spectral efficiency, the orthogonal-wavelength-division multiplexing scheme is suggested. In this scheme the WDM channels are spaced at the symbol rate, thus achieving the spectral efficiency limit. Theory, simulation and experimental results demonstrate the feasibility of this approach. Infinite impulse response filtering is shown to be an efficient alternative to finite impulse response filtering for chromatic dispersion compensation. Theory, design considerations, simulation and experimental results relating to this topic are presented. Interaction between fiber dispersion and nonlinearity remains the last major challenge deterministic effects pose for long-haul optical data transmission. Experimental results which demonstrate the possibility to digitally mitigate both dispersion and nonlinearity are presented. Impairment compensation is achieved using backward propagation by implementing the split-step method. Efficient realizations of the dispersion compensation operator used in this implementation are considered. Infinite-impulse response and wavelet-based filtering are both investigated as a means to reduce the required computational load associated with signal backward-propagation. Possible future research directions conclude this dissertation.
