Takashi Goh

Fabrication of silica-on-Si waveguide with higher index difference and its application to 256 channel arrayed waveguide multi/demultiplexer

Improved techniques were used to fabricate a silica-on-Si waveguide with a higher core-to-cladding index difference and a 2 mm bending radius. A 256 channel and 25 GHz spacing arrayed-waveguide multiplexer with low loss and low crosstalk was successfully fabricated for the first time using the waveguides.

Four-degree hub switch module using multi-chip planar lightwave circuit integration technology for transparent ROADM ring interconnection

We have developed a PLC-based 32-wavelength 4-degree hub switch module, which consists of a broadcast coupler with a demultiplexer for local-drop, and a WSS with wavelength specific ports for local-add. The module size is 220/spl times/135/spl times/14 mm. The insertion loss of the express path in the WSS is 10.8 dB.

Advanced Optical Modulators Using Silica-LiNbO3 Hybrid Configuration

We review optical modulators with a hybrid configuration of silica PLCs and LiNbO3 phase modulators. The hybrid configuration is highly scalable for advanced modulation formats, and is reliable both thermally and mechanically.