Photonics Research, 2016, 4 (6): 06000245, Published Online: Dec. 23, 2016
All-optical two-channel polarization-multiplexing format conversion from QPSK to BPSK signals in a silicon waveguide 
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Fig. 1. Principle of the format conversion from a Pol-MUX QPSK signal to Pol-MUX BPSK signals based on phase-doubled FWM in a silicon waveguide. (a) Phase-doubled FWMs with polarization-angled pumps, and (b) phase change between the QPSK signal and the BPSK idler via the phase-doubled FWM process.
Fig. 2. Experimental setup of the two-channel format conversion from Pol-MUX QPSK to Pol-MUX BPSK signals based on phase-doubled FWM in a silicon waveguide.
Fig. 3. Measured optical spectrum of the FWM processes for two-channel format conversion at the end of the silicon waveguide.
Fig. 4. Measured eye diagrams of the Pol-MUX QPSK signal: (a) S X S Y I 1 I 2 I 1 X I 1 Y I 2 X I 2 Y
Fig. 5. Measured constellation diagrams of the Pol-MUX QPSK signal on signal S I 1 I 2 S X S Y I 1 X I 1 Y I 2 X I 2 Y
Xianglian Feng, Zhihang Wu, Xiaoyan Wang, Sailing He, Shiming Gao. All-optical two-channel polarization-multiplexing format conversion from QPSK to BPSK signals in a silicon waveguide[J]. Photonics Research, 2016, 4(6): 06000245.
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