Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4957078 | Optical Fiber Technology | 2017 | 15 Pages |
Abstract
A joint carrier recovery scheme for polarization division multiplexing (PDM) coherent optical transmission system is proposed and demonstrated, in which the extended Kalman filter (EKF) is exploited to estimate and equalize the carrier frequency offset (CFO) and carrier phase noise (CPN) simultaneously. The proposed method is implemented and verified in the PDM-QPSK system and the PDM-16QAM system with the comparisons to conventional improved Mth-power (IMP) algorithm for CFO estimation, blind phase search (BPS) algorithm or Viterbi-Viterbi (V-V) algorithm for CPN recovery. It is demonstrated that the proposed scheme shows high CFO estimation accuracy, with absolute mean estimation error below 1.5 MHz. Meanwhile, the proposed method has the CFO tolerance of [±3 GHz] for PDM-QPSK system and [±0.9 GHz] for PDM-16QAM system. Compare with IMP/BPS and IMP/V-V, the proposed scheme can enhance the linewidth symbol duration product from 3 Ã 10â4 (IMP/BPS) and 2 Ã 10â4 (IMP/V-V) to 1 Ã 10â3 for PDM-QPSK, and from 1 Ã 10â4 (IMP/BPS) to 3 Ã 10â4 for PDM-16QAM, respectively, at the 1 dB optical signal-to-noise ratio (OSNR) penalty. The proposed Kalman filter also shows a fast convergence with only 100 symbols and much lower computational complexity.
Keywords
Related Topics
Physical Sciences and Engineering
Computer Science
Computer Networks and Communications
Authors
Linqian Li, Yiqiao Feng, Wenbo Zhang, Nan Cui, Hengying Xu, Xianfeng Tang, Lixia Xi, Xiaoguang Zhang,