Direct time-domain optical demultiplexing of 10-Gb/s NRZ signals using side-injection light-controlled bistable laser diode

We demonstrate high-speed direct optical demultiplexing of nonreturn-to-zero (NRZ) signals using a side-injection light-controlled bistable laser diode integrated into the optical gate and bit memory regions. The 2.5-Gb/s demultiplexed output signals are each selected once every 4 bits from 10-Gb/s NRZ optical input signals by the modulator-mode subwaveguide region. Then each signal is regenerated and its bit-width is converted in the bistable region. All functions are integrated on a single chip.