Yanfu Yang, Qun Zhang, Yong Yao, Guoliang Cao, Kangping Zhong, Xian Zhou, Alan Pak Tao Lau, Chao Lu. Decision-free radius-directed Kalman filter for universal polarization demultiplexing of square M-QAM and hybrid QAM signals[J]. Chinese Optics Letters, 2016, 14(11): 110601
- Chinese Optics Letters
- Vol. 14, Issue 11, 110601 (2016)
Fig. 1. Block diagram for the proposed polarization demultiplexing and tracking algorithm.
Fig. 2. Constellation diagrams of before demultiplexing, after demultiplexing, and carrier phase recovery for (a) PDM-QPSK, (b) PDM-16QAM, (c) PDM-64QAM, and (d) PDM-hybrid-QPSK/16QAM (red line is the targeted circle).
Fig. 3. BER vs. polarization rotation angular frequency with different Q
Fig. 4. Simulated BER versus OSNR for the 112 Gb/s PDM-QPSK (28 GB), PDM-16QAM (14 GB), and THDQ signals (QPSK/16QAM) with the proposed universal polarization methods. The 16QAM results with the methods proposed in Ref. [15] are also presented for comparison.
Fig. 5. Simulated OSNR penalty vs. polarization rotation angular frequency for 112 Gb/s PDM-QPSK and PDM-16QAM.
Fig. 6. Experimental scheme and digital processing of the 112 Gb/s PDM-QPSK/PDM-16QAM coherent optical communication system.
Fig. 7. Q
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