Xianglian Feng

All-optical wavelength conversion and five-channel multicasting for 20 Gbit/s QPSK signals in a silicon waveguide.

Wavelength conversion and five-channel multicasting for 20  Gbit/s quadrature phase-shift keying signals have been experimentally demonstrated based on four-wave mixing in a silicon waveguide with digital coherent detection. The eye diagrams and constellation diagrams of the converted and multicasting idlers are successfully observed. Moreover, the bit-error rates (BERs) of the generated idlers are measured and the power penalties are all less than 0.7 dB at a BER of 3×10(-3).

Integrated wavelength conversion for adaptively modulated WDM-OFDM signals in a silicon waveguide

All-optical wavelength conversion for 2×11.64 GBaud adaptively-modulated orthogonal frequency division multiplexing (AM-OFDM) signals with QPSK/16QAM formats is experimentally demonstrated in a silicon waveguide. The AM-OFDM signal with partly higher- (and lower-) order formats on lower- (and higher-) frequency subcarriers has better overall conversion performance in receiving optical signal-to-noise ratio and power penalty. In comparison with the OFDM-QPSK signal, at the BER of 3.8×10-3, the bit rate increases 11.64 Gbit/s per channel almost without conversion power penalty increased by replacing the QPSK sequence with the 16QAM sequence on half subcarriers.

All-Optical Signal Processing for Optical Communications Using Four-Wave Mixing in Silicon Waveguides

We systematically reviewed our works on all-optical signal processing for optical communication networks, such as wavelength conversion, wavelength multicasting, and logic gates, based on four-wave mixing in silicon waveguides.