All-optical two-channel polarization-multiplexing format conversion from QPSK to BPSK signals in a silicon waveguide
All-optical two-channel format conversion is proposed and experimentally demonstrated from a 40 Gbit/s polarization multiplexing (Pol-MUX) non-return-to-zero quadrature phase-shift keying (QPSK) signal to Pol-MUX binary phase-shift keying (BPSK) signals by using phase-doubled four-wave mixing effects with two polarization-angled pumps in a silicon waveguide. The eye diagrams and constellation diagrams of the original QPSK sequences and the converted BPSK sequences of each channel are clearly observed on the two polarization states. Moreover, the bit error rates (BERs) of the two converted idlers are measured. The power penalties of all these converted BPSK sequences on both X and Y polarization states are less than 3.4 dB at a BER of 3.8 × 10?3.(20130101110089); Natural Science Foundation of Zhejiang Province (LY14F050006).
基金项目：National Natural Science Foundation of China (NSFC) (61475138, 61675177); Specialized Research Fund for the Doctoral Program of Higher Education of China
Zhihang Wu：Centre for Optical and Electromagnetic Research, State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310058, China
Xiaoyan Wang：Centre for Optical and Electromagnetic Research, State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310058, China
Sailing He：Centre for Optical and Electromagnetic Research, State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310058, China
Shiming Gao：Centre for Optical and Electromagnetic Research, State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310058, China
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Xianglian Feng, Zhihang Wu, Xiaoyan Wang, Sailing He, and Shiming Gao, "All-optical two-channel polarization-multiplexing format conversion from QPSK to BPSK signals in a silicon waveguide," Photonics Research 4(6), 245-248 (2016)