An ultra-low dimension wavelength division multiplexer based on multimode interference waveguide
As a core component for data transmission,the wavelength division multiplexer/demultiplexer(WDM)is extensively utilized in on-chip optical interconnect networks,where the most crucial parameters for these devices in-clude device size,insertion loss,and crosstalk levels.To address the issues of large size and uneven optical power dis-tribution in conventional silicon-based arrayed waveguide gratings(AWGs),a 1×4 WDM based on a silicon-on-insu-lator(SOI)platform incorporating a ring reflector-assisted multimode interference waveguide is proposed,which can realize the wavelength separation of different channels.The core size of the device is only 10 μm × 34 μm,and the minimum crosstalk between adjacent channels is-14.42 dB.
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