Joint equalization scheme of ultra-fast RSOP and large PMD compensation in presence of residual chromatic dispersion
Wei Yi,Zibo Zheng,Nan Cui,Xiaoguang Zhang,Liyuan Qiu,Nannan Zhang,Lixia Xi,Wenbo Zhang,Xianfeng Tang +8 more
TLDR
A new Kalman filter structure is proposed, which can jointly compensate ultra-fast RSOP, large PMD and RCD, and compared with CMA/MMA, the proposed Kalman scheme can provide a significant performance enhancement.Abstract:
Polarization demultiplexing is generally carried out by a multiple-input multiple-output (MIMO) based algorithm in polarization division multiplexing (PDM) coherent systems. However, in some extreme environments, the MIMO algorithm becomes inapplicable due to the ultra-fast rotation of the state of polarization (RSOP) and large polarization mode dispersion (PMD). In addition, the residual chromatic dispersion (RCD) is always present because of the mismatch of the compensated chromatic dispersion and real value induced in the optical fiber channel. According to the literature, the Kalman filter-based polarization demultiplexing algorithms possess very weak RCD tolerance. Faced with this dilemma, in this paper, a new Kalman filter structure is proposed, which can jointly compensate ultra-fast RSOP, large PMD and RCD. This Kalman filter structure enables the equalization of the RSOP in the time domain and compensation for RCD and PMD in the frequency domain. We verified the performance of the proposed Kalman scheme in the 28 Gbaud PDM-QPSK/16 QAM coherent system, with a comparison to constant modulus algorithm/multiple modulus algorithm (CMA/MMA). The simulation results confirm that, compared with CMA/MMA, the proposed Kalman scheme can provide a significant performance enhancement to cope with ultra-fast RSOP (up to 3 Mrad/s) and large PMD (more than 200 ps) with a large tolerance to RCD (over the range of ± 820 ps/nm in PDM-QPSK and ± 500 ps/nm in PDM-16 QAM).read more
Citations
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Ultra-fast RSOP tracking via 3 pilot tones for short-distance coherent SCM systems.
TL;DR: In this article, an algorithm to track the rotation of state of polarization (RSOP) for short-distance coherent subcarrier-multiplexing systems is proposed, where 3 pilot tones are used to estimate RSOP matrices on a block-by-block basis and recover phase noise as well.
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True Equalization of Polarization-Dependent Loss in Presence of Fast Rotation of SOP
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References
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Chromatic Dispersion Compensation Using Digital IIR Filtering With Coherent Detection
Gilad Goldfarb,Guifang Li +1 more
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