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Wavelength division multiplexing (WDM) devices are key elements of Photonicintegrated circuits (PICs). Conventional WDM devices based on siliconwaveguides and photonic crystals have limited transmittance due to high lossintroduced by the strong backward scattering from defects. In addition, it ischallenging to reduce the footprint of those devices. Here we theoreticallydemonstrate a WDM device in the telecommunication range based on all-dielectricsilicon topological valley photonic crystal (VPC) structures. We tune itseffective refractive index by tuning the physical parameters of the lattice inthe silicon substrate, which can continuously tune the working wavelength rangeof the topological edge states, which allows designing WDM devices withdifferent channels. The WDM device has two channels (1470 nm-1523 nm and 1548nm-1609 nm), with contrast ratios of 22.4 dB and 24.9 dB, respectively. Theprinciple of manipulating the working bandwidth of the topological edge statescan be generally applied in designing different integratable photonic devices,thus it will find broad applications.

Design of wavelength division multiplexing devices based on tunable edge states of valley photonic crystals