Performance Analysis of Optical Systems Using Approximate Phase Noise Statistics - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Performance Analysis of Optical Systems Using Approximate Phase Noise Statistics write by . This book was released on 1996. Performance Analysis of Optical Systems Using Approximate Phase Noise Statistics available in PDF, EPUB and Kindle.
Noise Statistics in Optically Pre-amplified DPSK Receivers with Optical Mach-Zehnder Interferometer Demodulation
Noise Statistics in Optically Pre-amplified DPSK Receivers with Optical Mach-Zehnder Interferometer Demodulation - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Noise Statistics in Optically Pre-amplified DPSK Receivers with Optical Mach-Zehnder Interferometer Demodulation write by Zhenqian Qu. This book was released on 2004. Noise Statistics in Optically Pre-amplified DPSK Receivers with Optical Mach-Zehnder Interferometer Demodulation available in PDF, EPUB and Kindle. 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
Study of Phase Noise in Optical Coherent Systems - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Study of Phase Noise in Optical Coherent Systems write by Ramtin Farhoudi. This book was released on 2015. Study of Phase Noise in Optical Coherent Systems available in PDF, EPUB and Kindle. 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
Phase-Modulated Optical Communication Systems - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Phase-Modulated Optical Communication Systems write by Keang-Po Ho. This book was released on 2005-12-06. Phase-Modulated Optical Communication Systems available in PDF, EPUB and Kindle. 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
Proceedings 1995 IEEE International Symposium on Information Theory - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Proceedings 1995 IEEE International Symposium on Information Theory write by IEEE Information Theory Society. This book was released on 1995. Proceedings 1995 IEEE International Symposium on Information Theory available in PDF, EPUB and Kindle.
