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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 26 — Dec. 10, 2012
  • pp: B405–B412

Nonlinear mitigation using carrier phase estimation and digital backward propagation in coherent QAM transmission

Chien-Yu Lin, Rameez Asif, Michael Holtmannspoetter, and Bernhard Schmauss  »View Author Affiliations

Optics Express, Vol. 20, Issue 26, pp. B405-B412 (2012)

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We investigate the performance of carrier phase estimation (CPE) and digital backward propagation (DBP) in compensating fiber nonlinearity for 224Gbps polarization-multiplexed quadrature-amplitude-modulation coherent systems with level of 4 and 16 (PM-4-QAM and PM-16-QAM) over standard single-mode fiber (SSMF) uncompensated link. The results from numerical simulation show the individual performance of CPE and DBP as well as their mutual influence. With DBP compensation, required CPE tap number for optimal performance can be reduced by 50% for 4-QAM signal and 67% for 16-QAM signal compared to linear compensation. On the other hand, employing CPE compensation after DBP also allows to reduce DBP steps. In the mentioned PM-16-QAM system, 60% reduction in the required number of DBP steps to achieve BER=10−3 is possible, with a step-size of 200km, which reveals great potential to reduce the complexity for future real time implementation.

© 2012 OSA

OCIS Codes
(060.1660) Fiber optics and optical communications : Coherent communications
(060.2330) Fiber optics and optical communications : Fiber optics communications
(190.4370) Nonlinear optics : Nonlinear optics, fibers

ToC Category:
Subsystems for Optical Networks

Original Manuscript: October 1, 2012
Revised Manuscript: November 13, 2012
Manuscript Accepted: November 14, 2012
Published: November 30, 2012

Virtual Issues
European Conference on Optical Communication 2012 (2012) Optics Express

Chien-Yu Lin, Rameez Asif, Michael Holtmannspoetter, and Bernhard Schmauss, "Nonlinear mitigation using carrier phase estimation and digital backward propagation in coherent QAM transmission," Opt. Express 20, B405-B412 (2012)

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