Integrated all-optical wavelength multicasting for 40Â Gbit/s PDM-QPSK signals using a single silicon waveguide

All-optical wavelength multicasting is presented and experimentally demonstrated for 40 Gbit/s polarization-division-multiplexed (PDM) nonreturn-to-zero quadrature phase-shift keying (QPSK) signals using four-wave mixing (FWM) with angled-polarization pumps in a silicon waveguide. Five multicast channels are obtained on the generated idlers. The eye diagrams, constellation diagrams, and bit error rates (BERs) of the QPSK sequences on the two polarization states are measured for each wavelength channel. The power penalties of all these multicast QPSK sequences on x or y polarization state are less than 2.0 dB at the BER of 3 × 10−3.