We have developed a new planar lightwave circuit (PLC) platform eliminating
Si terraces for hybrid integrated optical modules. This PLC platform has t
he advantage of a lower fabrication cost than the conventional PLC platform
with an Si terrace, because it does not require fabrication processes such
as Si terrace forming and mechanical polishing. Using our new PLC platform
structure, we fabricated a transceiver for optical access networks and an
8-channel multi-channel photoreceiver for wavelength division multiplexing
(WDM) interconnection systems.