Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 40
Book Description
Performance Analysis of Optical Systems Using Approximate Phase Noise Statistics
Author: Noise Statistics in Optically Pre-amplified DPSK Receivers with Optical Mach-Zehnder Interferometer Demodulation
Author: Zhenqian QuPublisher:
ISBN:
Category : Data transmission systems
Languages : en
Pages : 0
Book Description
A comprehensive theoretical analysis of noise statistics in optically pre-amplified DPSK receivers with optical Mach-Zehnder interferometer demodulation is presented for the first time. For such a receiver, there are three dominant noise sources which degrade the performance of DPSK systems: signal-ASE beat noise, ASE-ASE beat noise, and nonlinear phase noise. The first two noise sources are added to the signal, and thus they can be referred to as linearly additive noise. The detailed derivations of the exact noise statistics considering both the linearly additive noise and nonlinear phase noise are given in this thesis. Due to simplicity, the Gaussian approximation has been widely used in the case of optical systems with intensity modulation and direct detection (IM/DD). Therefore, the Gaussian approximation of noise statistics is also given and compared with the exact noise statistics in DPSK receivers. Numerical calculations show that the exact noise statistics are quite different from the Gaussian approximation, particularly for DPSK receivers with balanced detection. The numerical results of probability density functions and bit error rate with the exact noise statistics are in good agreement with the published experimental results. A comparative study of noise statistics in both DPSK and IM/DD receivers is also given.
Study of Phase Noise in Optical Coherent Systems
Author: Ramtin FarhoudiPublisher:
ISBN:
Category :
Languages : en
Pages : 70
Book Description
Phase noise is an important issue in designing today's optical coherent systems. Although phase noise is studied heavily in wireless communications, some aspects of phase noise are novel in optical coherent systems. In this thesis we explore phase noise statistics in optical coherent systems and propose a novel technique to increase system robustness toward phase noise. Our first contribution deals with the study of phase noise statistics in the presence of electronic chromatic dispersion (CD) compensation in coherent systems. We show that previously proposed model for phase noise and CD interaction must be modified due to an overly simple model of carrier phase recovery. We derive a more accurate expression for the estimated phase noise of decision directed (DD) carrier phase recovery, and use this expression to modify the decision statistics of received symbols. We calculate bit error rate (BER) of a differential quadrature phase shift keying (DQPSK) system semi-analytically using our modified decision statistics and show that for ideal DD carrier phase recovery the semi-analytical BER matches the BER simulated via Monte-Carlo (MC) technique. We show that the semi-analytical BER is a lower bound of simulated BER from Viterbi-Viterbi (VV) carrier phase recovery for a wide range of practical system parameters. Our second contribution is concerned with adapting a multi-level coded modulation (MLCM) technique for phase noise and additive white Gaussian noise (AWGN) limited coherent system. We show that the combination of a phase noise optimized constellation with MLCM offers a phase-noise robust system at moderate complexity. We propose a numerical method to design set-partitioning (mapping bits to symbols) and optimizing code rates for minimum block error rate (BLER).We verify MLCM performance in coherent systems of 16-ary constellations impaired by nonlinear and Wiener phase noise. For nonlinear phase noise, superior performance of our MLCM design over a previously designed MLCM system is demonstrated in terms of BLER. For Wiener phase noise, we compare optimized and square 16-QAM constellations assuming either MLCM or uniform rate coding. We compare post forward error correction (FEC) BER in addition to BLER by both simulation and experiment and show that superior BLER performance is translated into post FEC BER. Our experimental post FEC BER results follow the same trends as simulated BER, validating our design.
Phase-Modulated Optical Communication Systems
Author: Keang-Po HoPublisher: Springer Science & Business Media
ISBN: 0387255559
Category : Science
Languages : en
Pages : 440
Book Description
Fiber-optic communication systems have revolutionized our telecommunication infrastructures – currently, almost all telephone land-line, cellular, and internet communications must travel via some form of optical fibers. In these transmission systems, neither the phase nor frequency of the optical signal carries information – only the intensity of the signal is used. To transmit more information in a single optical carrier, the phase of the optical carrier must be explored. As a result, there is renewed interest in phase-modulated optical communications, mainly in direct-detection DPSK signals for long-haul optical communication systems. When optical amplifiers are used to maintain certain signal level among the fiber link, the system is limited by amplifier noises and fiber nonlinearities. Phase-Modulated Optical Communication Systems surveys this newly popular area, covering the following topics: - The transmitter and receiver for phase-modulated coherent lightwave systems - Method for performance analysis of phase-modulated optical signals - Direct-detection DPSK signal with fiber nonlinearities, degraded by nonlinear phase noise and intrachannel effects - Wavelength-division-multiplexed direct-detection DPSK signals - Multi-level phase-modulated optical signals, such as the four-phase DQPSK signal. Graduate students, professional engineers, and researchers will all benefit from this updated treatment of an important topic in the optical communications field.
Proceedings 1995 IEEE International Symposium on Information Theory
Author: IEEE Information Theory SocietyPublisher: Institute of Electrical & Electronics Engineers(IEEE)
ISBN:
Category : Computers
Languages : en
Pages : 540
Book Description
IEEE International Symposium on Information Theory
Author: Optical Performance Monitoring
Author: Calvin C. K. ChanPublisher: Academic Press
ISBN: 0080959172
Category : Technology & Engineering
Languages : en
Pages : 510
Book Description
This in-depth, detailed reference presents for the first time a comprehensive treatment of recent advances in optical performance monitoring. Written by leading experts in the field, the book provides an overview of recent developments in the area and the role of OPM in future optical systems and networks. Detailed discussions of various advanced techniques are provided to illustrate their principles. FEATURES: - Presents the principles and applications of advanced OPM techniques, together with a comparative evaluation of their effectiveness in monitoring individual parameters, such as optical signal-to-noise ratio, chromatic dispersion, and polarization mode dispersion - Explains the principles of the various advanced optical signal processing techniques and their applications in OPM - Examines the role and applications of OPM in optical networks, including optical transport networks, coherent optical systems, and long-haul optical transmission systems - Discusses the current approaches of OPM in the global standard SDH/SONET This book is ideal for technical professionals and researchers who want to understand and evaluate advanced techniques in OPM and their impact on the practical design of next-generation optical systems and networks. - Provides a thorough and detailed discussion of the latest optical performance monitoring (OPM) techniques and their applications, presenting a comparative analysis of each method - Contains high-quality technical contributions from leading experts, covering both principles and practical aspects of advanced OPM techniques - Addresses challenges and opportunities related to OPM in next-generation reconfigurable optical systems and networks
Proceedings, ... IEEE International Symposium on Information Theory
Author: Optical Code Division Multiple Access Communication Networks
Author: Hongxi YinPublisher: Springer Science & Business Media
ISBN: 3540684689
Category : Technology & Engineering
Languages : en
Pages : 399
Book Description
Optical code division multiple access (OCDMA) communication network technology will play an important role in future optical networks, such as optical access and metropolitan area networks. OCDMA technology can also be applied to implement optical signal multiplexing and label switching on backbone networks. Optical Code Division Multiple Access Communication Networks - Theory and Applications introduces the code theory of OCDMA, the methods and technologies of OCDMA encoding and decoding, the theory and methods of analyzing OCDMA systems with various receiver models and realizing multiple-class services with different bit rates and QoS. In addition, OCDMA network architectures, protocols and applications are discussed in detail. The up-to-date theoretical and experimental results on OCDMA systems and networks are also reported. A large number of encoding/decoding examples and many analysis and simulation results of code and system performances are given. It is a valuable text and/or reference book for postgraduates majoring in telecommunication and photonics to obtain a well-knit theoretical foundation and for engineers in R&D and management of optical communications. Dr. Yin is an Associate Professor of the School of Electronics Engineering and Computer Science at Peking University, China, and was a Visiting Research Fellow of Optoelectronics Research Centre (ORC) at University of Southampton, UK. Dr. Richardson is a Professor for optical communications and Deputy Director of ORC at University of Southampton, UK, and is responsible for much of the ORC's fiber related activities.
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