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Recent progress on silica-based PLC hybrid integration technology

Silica-based planar lightwave circuit (PLC) hybrid integration is a promising candidate for realizing highly functional photonic components and subsystems. This paper reviews the key features of PLC hybrid integration technology, including the PLC platform, semiconductor optical devices suitable for hybrid integration and the assembly technique. Recently developed optical modules that use this technology are also described. They include a bi-directional optical transreceiver module and a multiwavelength laser module, both of which employ a PLC platform with a super high refractive index difference.