Abstract
Wavelength-division-multiplexing (WDM) transceiver filters are one of the most essential components for realizing the fiber-to-the-home (FTTH) networks. In recent years, silicon photonics have provided a very attractive platform to build ultra-compact photonic integrated devices with CMOS-compatible processes. In this review, we focus on the recent progresses on diplexers/triplexers based on multimode interference couplers (MMI), and directional couplers (DC). The polarization-insensitive devices are also discussed.
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