Frequency-Domain Blind Equalization for Long-Haul Coherent Pol-Mux 16-QAM System With CD Prediction and Dual-Mode Adaptive Algorithm

Chen Zhu; An V. Tran; Simin Chen; Liang B. Du; Trevor Anderson; Arthur J. Lowery; Efstratios Skafidas

doi:10.1109/JPHOT.2012.2214378

IEEE Photonics Journal (Jan 2012)

Frequency-Domain Blind Equalization for Long-Haul Coherent Pol-Mux 16-QAM System With CD Prediction and Dual-Mode Adaptive Algorithm

Chen Zhu,
An V. Tran,
Simin Chen,
Liang B. Du,
Trevor Anderson,
Arthur J. Lowery,
Efstratios Skafidas

Affiliations

Chen Zhu: <formula formulatype="inline"><tex Notation="TeX">$^{1}$</tex></formula>Victoria Research Laboratory, NICTA Ltd., Department of Electrical and Electronic Engineering, University of Melbourne, Parkville, Australia
An V. Tran: Victoria Research Laboratory, NICTA Ltd., Department of Electrical and Electronic Engineering, University of Melbourne, Parkville, Australia
Simin Chen: Victoria Research Laboratory, NICTA Ltd., Department of Electrical and Electronic Engineering, University of Melbourne, Parkville, Australia
Liang B. Du: <formula formulatype="inline"><tex Notation="TeX">$^{2}$</tex></formula>Center for Ultrahigh-bandwidth Devices for Optical Systems (CUDOS), Electrical and Computer Systems Engineering, Monash University, Clayton, Australia
Trevor Anderson: Victoria Research Laboratory, NICTA Ltd., Department of Electrical and Electronic Engineering, University of Melbourne, Parkville, Australia
Arthur J. Lowery: Center for Ultrahigh-bandwidth Devices for Optical Systems (CUDOS), Electrical and Computer Systems Engineering, Monash University, Clayton, Australia
Efstratios Skafidas: Victoria Research Laboratory, NICTA Ltd., Department of Electrical and Electronic Engineering, University of Melbourne, Parkville, Australia

DOI: https://doi.org/10.1109/JPHOT.2012.2214378
Journal volume & issue: Vol. 4, no. 5
pp. 1653 – 1661

Abstract

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The combination of polarization-multiplexing (pol-mux) high-order quadrature-amplitude-modulation (QAM) format and non-data-aided (NDA) channel equalization largely enhances the spectral efficiency of the coherent optical systems. In this paper, we present a two-stage frequency-domain equalization method for long-haul coherent pol-mux NDA system with 16-QAM modulation format. Chromatic dispersion (CD) is blindly estimated and compensated in the first stage of the equalizer, while multimodulus-algorithm-assisted decision-directed multimodulus algorithm (MMA-DDMA) is designed for the second stage to further enhance the equalization performance. The proposed algorithms are experimentally demonstrated in a 80-Gb/s coherent 16-QAM system over 800-km fiber transmission and 30-ps mean differential group delay to achieve wide-range precise CD estimation and better equalization performance compared with conventional adaptive algorithms.

Published in IEEE Photonics Journal

ISSN: 1943-0655 (Online)
Publisher: IEEE
Country of publisher: United States
LCC subjects: Technology: Engineering (General). Civil engineering (General): Applied optics. Photonics; Science: Physics: Optics. Light
Website: http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=4563994

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