1 × 8 MMI based multi-channel interference laser integrated with SOA through a 2-port multimode interference reflector.

A 1 × 8 multimode interferometer (MMI) based multi-channel interference (MCI) widely tunable laser integrated with semiconductor optical amplifier (SOA) through a 2-port multimode interference reflector (MIR) is reported in this paper. The 2-port MIR can be fabricated with deeply etched waveguides of the MCI laser with no extra fabrication process, which decreases the fabrication complexity greatly. To reduce the loss arising from mode mismatch between surface and deep ridge waveguides, a tapered shallow-deep transition structure is designed and fabricated with a loss of 0.

Research of two-dimensional beam steering in LCOS-based wavelength selective switch.

The phenomenon of two-dimensional beam steering in liquid crystal on silicon (LCOS) is demonstrated. We propose a novel flexible wavelength selective switch (WSS) using LCOS two-dimensional beam steering. The cross talk of adjacent channel in the WSS is theoretically small, while the measured insert loss is lower than 15 dB.