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Abstract An effective solution to enhance the capacity of an optical‐interconnect link is utilizing advanced multiplexing technologies, like wavelength‐division‐multiplexing (WDM), polarization‐division multiplexing (PDM), spatial‐division multiplexing (SDM), bi‐directional multiplexing, etc. On‐chip (de)multiplexers are necessary as key components for realizing these multiplexing systems and they are desired to have small footprints due to the limited physical space for on‐chip optical interconnects. As silicon photonics has provided a very attractive platform to build ultrasmall photonic integrated devices with CMOS‐compatible processes, in this paper we focus on the discussion of silicon‐based (de)multiplexers, including WDM filters, PDM devices, and SDM devices. The demand of devices to realize a hybrid multiplexing technology (combining WDM, PDM and SDM) as well as a bidirectional multiplexing technologies are also discussed to achieve Peta‐bit optical interconnects.
Dai et al. (Thu,) studied this question.