Chromatic dispersion and PMD mitigation at 10 Gb/s using Viterbi equalization for DPSK and DQPSK modulation formats

University of Melbourne, Melbourne, Victoria, Australia
Optics Express (Impact Factor: 3.49). 05/2007; 15(9):5271-6. DOI: 10.1364/OE.15.005271
Source: PubMed


We explore the potential of chromatic dispersion and polarization-mode dispersion (PMD) mitigation using Viterbi equalization in 10 Gb/s nonreturn-to-zero differential phase-shift keying (NRZ-DPSK) and differential quadrature phase-shift keying (NRZ-DQPSK) systems. We show through Monte Carlo simulations that using Viterbi equalization improves the performance of NRZ-OOK, NRZ-DPSK and NRZ-DQPSK receivers. For NRZ-DQPSK receiver with a Viterbi equalizer, the chromatic dispersion tolerance is about 5000 ps/nm and the 1st order PMD tolerance is about 160 ps at 3 dB OSNR penalty.

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    • "Experimental comparison of the MLSE performance in the presence of CD and PMD has been presented [7]. In [5], the simulation results are based on static CD and PMD. It is important to track and compensate the dynamically varying PMD [8] because the performance of the optical transmission systems may be affected by fast changing PMD. "
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    ABSTRACT: Compensating dynamically changing polarization-mode dispersion (PMD) is important for optical fiber transmission systems. We present simulations of a Viterbi equalization for dynamic PMD mitigation in 10-Gb/s nonreturn-to-zero differential phase-shift keying systems. The equalizer can dynamically track fast varying differential group delay (DGD) and achieve similar performance to static DGD.
    Full-text · Article · Mar 2009 · IEEE Photonics Technology Letters
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    • "Recently, electronic domain processing approaches have gained considerable research interest to overcome CD and other distortions such as polarization mode dispersion (PMD) [4]. Mature equalization techniques in modern wireless digital communication systems, such as decision feedback equalizers (DFEs) and maximum likelihood sequence estimation (MLSE) equalizers [5] [6] have been successfully applied for mitigation of CD and PMD distortion. Inspired by this electronic domain processing, there has been an attempt to monitor CD in electronic domain [1], unlike other conventional approaches [7] [8]. "
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    ABSTRACT: In this paper we present an electronic domain solution for chromatic dispersion (CD) monitoring algorithm based on the estimated time domain channel in electronic domain using channel estimation methods. The proposed scheme utilizes kurtosis as a CD measurement, directly computed from the estimated inter-symbol-interference (ISI) channel due to the CD distortion. Hence, the proposed scheme exhibits robust performance under OSNR variation, in contrast to the existing electronic domain approach based on minimum mean squared error (MMSE) fractionally-spaced equalizer taps [1]. The simulation results verify the CD monitoring ability of the proposed scheme.
    Preview · Article · Dec 2008 · Journal of the Optical Society of Korea
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    ABSTRACT: We propose and experimentally demonstrate a chromatic-dispersion (CD)-insensitive polarization-mode-dispersion (PMD) monitoring technique for phase-modulated signals utilizing the destructive response of a differential-group-delay (DGD)-generated interferometric filter. The detected radio-frequency (RF) power through this filter has a defined relationship to the accumulated DGD (i.e., first-order PMD), and thus the variations in power level of the low RF frequency are measured for monitoring. The experimental results show that this technique can monitor 0 ~ 100 ps of DGD with ~ 20-dB RF power variation, in 10-Gb/s nonreturn-to-zero (NRZ) differential phase-shift-keying and 20-Gb/s NRZ differential quadrature phase-shift-keying systems, which is insensitive to 0 ~ 640 ps/nm CD. The applicability of this monitoring technique to higher bit-rate phase-modulated signals is also investigated via simulation.
    No preview · Article · Feb 2008 · IEEE Photonics Technology Letters
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