Improving PDL Tolerance of Long-Haul PDM-OFDM Systems Using Polarization-Time Coding

Awwad, Élie; Jaouën, Yves; Othman, Ghaya Rekaya-Ben

doi:10.1364/sppcom.2012.sptu2a.5

Cited by 3 publications

(2 citation statements)

References 5 publications

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“…An important result is that the PT-coded OFDM does not induce any extra penalties in presence of non-linear effects. This experimental validation confirms a previous numerical investigation of the behavior of PT codes in non-linear propagation regime [30]. .…”

Section: Pt Coding In Non-linear Propagation Regimesupporting

confidence: 89%

“…The first term denote the coding gain of the FEC code and the third term denotes the coding gain provided by PT coding. Equation (30) shows that the total asymptotic gain obtained when concatenating a FEC code and a PT code is the sum of the gains provided by each code separately, validating the third result of our numerical investigation.…”

Section: Concatenation Of Fec and Pt Codingsupporting

confidence: 79%

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

Awwad¹,

Jaouën²,

Othman³

2013

Opt. Express

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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 1,000 km 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.

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Section: Pt Coding In Non-linear Propagation Regimesupporting

confidence: 89%

Section: Concatenation Of Fec and Pt Codingsupporting

confidence: 79%

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

Awwad¹,

Jaouën²,

Othman³

2013

Opt. Express

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Experimental Demonstration of Polarization-Dependent Loss Monitoring and Compensation in Stokes Space for Coherent Optical PDM-OFDM

Zhang

et al. 2014

J. Lightwave Technol.

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We have recently demonstrated polarization demultiplexing in Stokes space (SS-PDM), which is susceptible to polarization-dependent loss (PDL). In this paper, we apply the method of PDL monitoring and compensation in Stokes space to enhance SS-PDM. It is applied for each subcarrier in the frequency domain after SS-PDM. Because each subcarrier has a much lower speed and narrower bandwidth, the polarization effects that it experiences can be treated as flat. This method can work for different modulation formats on orthogonal frequency-division multiplexing (OFDM) subcarriers and only needs a small number of samples for convergence. In simulation, when the PDL is less than 3.5 dB, it significantly improves the performance of SS-PDM and is comparable with the conventional channel estimation based on training symbols (TSs). We also conduct the experiments of 66.6-Gb/s coherent optical PDM-OFDM with 4QAM subcarrier modulation over 5440-km SSMF and 133.3-Gb/s coherent optical PDM-OFDM with 16QAM subcarrier modulation over 960-km SSMF, respectively. The experimental results show that this method improves the performance of SS-PDM significantly and can match the performance of channel estimation based on TSs. To the best of our knowledge, this is the first experimental validation of PDL monitoring and compensation in Stokes space.

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On the Performance of Spatial Modulations Over Multimode Optical Fiber Transmission Channels

Damen

Othman

2019

IEEE Trans. Commun.

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Improving PDL Tolerance of Long-Haul PDM-OFDM Systems Using Polarization-Time Coding

Abstract: Abstract:We show that Polarization-Time codes can mitigate PDL impairments in long-haul OFDM systems. Coding gains are maintained in weakly non-linear regime and no extra penalty is added when non-linear effects become severe.

Cited by 3 publications

References 5 publications

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

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

Experimental Demonstration of Polarization-Dependent Loss Monitoring and Compensation in Stokes Space for Coherent Optical PDM-OFDM

On the Performance of Spatial Modulations Over Multimode Optical Fiber Transmission Channels

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