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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 19 — Sep. 23, 2013
  • pp: 22773–22790

Polarization-time coding for PDL mitigation in long-haul PolMux OFDM systems

Elie Awwad, Yves Jaouën, and Ghaya Rekaya-Ben Othman  »View Author Affiliations


Optics Express, Vol. 21, Issue 19, pp. 22773-22790 (2013)
http://dx.doi.org/10.1364/OE.21.022773


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Abstract

In this paper, we present a numerical, theoretical and experimental study on the mitigation of Polarization Dependent Loss (PDL) with Polarization-Time (PT) codes in long-haul coherent optical fiber transmissions using Orthogonal Frequency Division Multiplexing (OFDM). First, we review the scheme of a polarization-multiplexed (PolMux) optical transmission and the 2 × 2 MIMO model of the optical channel with PDL. Second, we introduce the Space-Time (ST) codes originally designed for wireless Rayleigh fading channels, and evaluate their performance, as PT codes, in mitigating PDL through numerical simulations. The obtained behaviors and coding gains are different from those observed on the wireless channel. In particular, the Silver code performs better than the Golden code and the coding gains offered by PT codes and forward-error-correction (FEC) codes aggregate. We investigate the numerical results through a theoretical analysis based on the computation of an upper bound of the error probability of the optical channel with PDL. The derived upper bound yields a design criterion for optimal PDL-mitigating codes. Furthermore, a transmission experiment of PDL-mitigation in a 1000km optical fiber link with inline PDL validates the numerical and theoretical findings. The results are shown in terms of Q-factor distributions. The mean Q-factor is improved with PT coding and the variance is also narrowed.

© 2013 OSA

OCIS Codes
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(060.1660) Fiber optics and optical communications : Coherent communications
(060.4080) Fiber optics and optical communications : Modulation
(060.4230) Fiber optics and optical communications : Multiplexing

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: July 31, 2013
Revised Manuscript: August 29, 2013
Manuscript Accepted: August 30, 2013
Published: September 20, 2013

Citation
Elie Awwad, Yves Jaouën, and Ghaya Rekaya-Ben Othman, "Polarization-time coding for PDL mitigation in long-haul PolMux OFDM systems," Opt. Express 21, 22773-22790 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-19-22773


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