Optical hybrid integration using planar lightwave circuit platform

Optical hybrid integration technology have been developed using a planar lightwave circuit (PLC) platform. The platform combines a silica optical waveguide and optical active devices to realize various optical functions without restricting the type of device. We employ two additional techniques to fabricate these optical modules, namely a multi-chip mounting technique for optical active devices and a PLC-PLC attachment technique. The use of a PLC platform and these techniques will make it possible to apply our technology to various optical modules from an optical transceiver module for subscriber systems to a multi-channel large-scale optical module such as that employed for WDM systems.