Joint equalization scheme of ultra-fast RSOP and large PMD compensation in presence of residual chromatic dispersion

Wei, Yi; Zheng, Zibo; Cui, Nan; Zhang, Xiaoguang; Qiu, Liyuan; Zhang, Nannan; Xi, Lixia; Zhang, Wenbo; Tang, Xianfeng

doi:10.1364/oe.27.021896

Cited by 30 publications

(7 citation statements)

References 14 publications

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“…6(a-d The dynamic RSOP tracking ability on the proposed schemes and the conventional scheme is evaluated in our test, and the OSNR value of the received optical signal is fixed at 13 dB. The used dynamic RSOP model can be described using the Jones transformation matrix [28]. It can be seen that only RSOP of <1 Mrad/s can be tracked using the conventional C-CMA+VVPE algorithm.…”

Section: Txmentioning

confidence: 99%

Experimental Investigation on Low-Complexity Adaptive Equalizer Including RSOP Tracking and Phase Recovery for 112 Gb/s PDM-QPSK Transmission System

Song

et al. 2021

IEEE Photonics J.

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A low-complexity adaptive equalizer including equalization, rotation of state of polarization (RSOP) tracking, and phase recovery is proposed for coherent optical polarization-division-multiplexing (PDM) quadrature phase-shifting keying (QPSK) transmission system. A conventional N-tap 2x2 butterfly finite impulse response filter is simplified to two N-tap filters and a 1-tap 2x2 filter. Two N-tap filters could compensate for inter-symbol interference and residual chromatic dispersion based on the same error cost function from the power sum of two polarization coupling constant modulus signals. 1-tap 2x2 filter which works on the nonlinear principal component analysis (NPCA) criterion is designed for joint polarization demultiplexing and phase recovery. NPCA is proved to not only void the singularity problem in the constant modulus algorithm (CMA) but also has faster tracking capability. Two kinds of adaptive equalizers using least mean squares NPCA (LMS-NPCA) and recursive least squares NPCA (RLS-NPCA) are compared in our simulation and experiment. In an experiment of 112 Gb/s PDM-QPSK transmission over 50 km standard single-mode fiber, the proposed two schemes have better transmission performance at RSOP speed of 1 Mrad/s and 5 Mrad/s compared to the conventional CMA and Viterbi-Viterbi phase estimation (VVPE) scheme. The reduced complexity of the proposed schemes is more than 40%.

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Section: Txmentioning

confidence: 99%

Experimental Investigation on Low-Complexity Adaptive Equalizer Including RSOP Tracking and Phase Recovery for 112 Gb/s PDM-QPSK Transmission System

Song

et al. 2021

IEEE Photonics J.

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“…As a promising method, many methods based on Kalman filter have been proposed to cope the polarization impairments 5 – 11 In 2016, a joint multi-polarization-effect tracking and equalization method based on two extended Kalman filters (EKF) was proposed. This method can cope with state of polarization (SOP) tracing, polarization demultiplexing, equalization for polarization dependent loss, and PMD in PDM-M-QAM coherent optical communication system 5 .…”

Section: Introductionmentioning

confidence: 99%

Joint equalization of fast RSOP and large PMD based on RD-EKF for PDM-MQAM system

Liu,

Ji,

Wang

et al. 2024

Opt. Eng.

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Extended Kalman filter (EKF) is a popular method to address the fast rotation of the state of polarization and large polarization mode dispersion in coherent optical communication. But it is usually underperforming in high-order modulation. Radiusdirected idea is introduced to enhance the performance of EKF-based method. We call the proposed scheme radius-directed extended Kalman filter (RD-EKF). The performance of the proposed Kalman scheme is verified both in the polarizationdivision multiplexed 16QAM and 64QAM system. By the results, the RD-EKF scheme has better performance and less complexity than conventional EKF method in the high modulation format system.

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“…For natural lightning strikes, the good state tracking and prediction capabilities of EKF can be used to compensate for RSOP in optical fibers [3] . The EKF algorithm is a state estimation method for dynamic systems that can achieve linearization of first-order accuracy by expanding the nonlinear function through Taylor series and ignoring higherorder terms of second-order and higher.…”

Section: Introductionmentioning

confidence: 99%

A flexible EKF/CKF switching scheme with fast frequency offset estimation method compensating fast RSOP induced by the lightning strikes

Liu,

Zhang,

Cui

et al. 2023

Fourteenth International Conference on Information Optics and Photonics (CIOP 2023)

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Joint equalization scheme of ultra-fast RSOP and large PMD compensation in presence of residual chromatic dispersion

Cited by 30 publications

References 14 publications

Experimental Investigation on Low-Complexity Adaptive Equalizer Including RSOP Tracking and Phase Recovery for 112 Gb/s PDM-QPSK Transmission System

Experimental Investigation on Low-Complexity Adaptive Equalizer Including RSOP Tracking and Phase Recovery for 112 Gb/s PDM-QPSK Transmission System

Joint equalization of fast RSOP and large PMD based on RD-EKF for PDM-MQAM system

A flexible EKF/CKF switching scheme with fast frequency offset estimation method compensating fast RSOP induced by the lightning strikes

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