Performance of turbo equalizers for optical PMD channels

This paper investigates the performance of iterative (turbo) equalization to mitigate the effects of a polarization-mode dispersion (PMD) in nonreturn-to-zero (NRZ) intensity-modulated optical-fiber transmission systems. A PMD can lead to severe distortions in the received electrical signal and is a...

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Bibliographic Details
Published in:Journal of lightwave technology Vol. 24; no. 3; pp. 1226 - 1236
Main Authors: Jager, M., Rankl, T., Speidel, J., Henning Bulow, Buchali, F.
Format: Journal Article
Language:English
Published: New York, NY IEEE 01.03.2006
Institute of Electrical and Electronics Engineers
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Algorithms
Applied sciences
Channels
Coding, codes
Compensation
Detection, estimation, filtering, equalization, prediction
Distortion
Equalization
Equalizers
Exact sciences and technology
Information, signal and communications theory
Iterative algorithms
Iterative decoding
Iterative equalization
Noise
Non-Gaussian
optical communications
Optical distortion
Optical fiber communications
Optical fiber polarization
Optical noise
Optical receivers
Optical signal processing
Optical telecommunications
Polarization mode dispersion
polarization-mode dispersion (PMD)
Receivers
Signal and communications theory
Signal, noise
signal-dependent noise
Statistics
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Transmission and modulation (techniques and equipments)
Performance evaluation
Iterative method
Equalizer
Polarization mode dispersion
Iterative equalization
Gaussian noise
Gaussian signal
NRZ code
A posteriori estimation
Optoelectronic device
Optical receiver
Optical fiber communication
High rate transmission
Electrical signal
signal-dependent noise
optical communications
Decoding circuit
Turbo code
Decoding
Equalization
Algorithm
Photodetector
Intensity modulation
Reduced order model
polarization-mode dispersion (PMD)
Limiter
ISSN:0733-8724, 1558-2213
Online Access:Get full text
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Summary:This paper investigates the performance of iterative (turbo) equalization to mitigate the effects of a polarization-mode dispersion (PMD) in nonreturn-to-zero (NRZ) intensity-modulated optical-fiber transmission systems. A PMD can lead to severe distortions in the received electrical signal and is a key limiter for the development of high-bit-rate transmission over currently used fibers. In order to reduce the distortions due to a PMD, the performance of symbol-by-symbol maximum a posteriori (sbs-MAP) soft-in/soft-out (SISO) decoders is studied. The SISO algorithms are adapted to the noise statistics of the optical channel where the photo detector leads to a non-Gaussian signal-dependent noise at the receiver side. The modified SISO algorithms are successfully employed for turbo equalization and results show that iterative (turbo) equalization and decoding for the compensation of a PMD can lead to a tremendous reduction in the bit error ratio (BER). Moreover, it is shown that, due to the robustness of mutual information, the extrinsic information transfer (EXIT) chart can be applied for the design of iterative receivers in optical transmission systems even with a non-Gaussian noise
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ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2005.863281