NDLI: Adaptive digital equalization in the presence of chromatic dispersion, PMD, and phase noise in coherent fiber optic systems

Content Provider	IEEE Xplore Digital Library
Author	Crivelli, D.E. Carter, H.S. Hueda, M.R.
Copyright Year	2004
Description	Author affiliation: Digital Commun. Res. Lab., Univ. Nacional de Cordoba, Argentina (Crivelli, D.E.; Carter, H.S.; Hueda, M.R.)
Abstract	Chromatic dispersion (CD) and polarization mode dispersion (PMD) severely limit the performance of optical transmission systems operating at and above 10 Gb/s. Electrical equalization techniques have been proposed to compensate dispersion in both coherent and intensity modulation/direct-detection (IM/DD) systems. We investigate the combined adaptive digital equalization of all-order PMD, CD, and laser phase noise in high-speed coherent optical transmission systems. Simultaneous equalization of these impairments has not been reported previously and is particularly important in modulation systems that exploit polarization to increase modulation efficiency. We propose a novel 4-dimensional equalizer structure for joint polarization modulation and M-ary differential phase shift keying (JPMDPSK) systems. The specific example considered is 40 Gb/s transmission with a 10 GBaud symbol rate, using DQPSK modulation on each axis of polarization. Our results show that the new four-dimensional equalizer can compensate channel dispersion of up to 1000 km of standard single-mode fiber, with less than 3 dB penalty in signal-to-noise ratio (SNR). This is a dramatic improvement over 40 Gb/s IM/DD systems. The feasibility of the very large scale integration (VLSI) of coherent receivers in current technology is also discussed.
Starting Page	2545
Ending Page	2551
File Size	595394
Page Count	7
File Format	PDF
ISBN	0780387945
DOI	10.1109/GLOCOM.2004.1378465
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-11-29
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Adaptive equalizers Chromatic dispersion Phase noise Optical fibers Polarization mode dispersion High speed optical techniques Optical modulation Optical noise Optical receivers Optical polarization
Content Type	Text
Resource Type	Article

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