On-Chip Coarse Wavelength Division Multiplexers Based on Silicon Subwavelength Gratings

An ultra-compact 4-channel coarse wavelength division multiplexer with silicon gratings is proposed. The designed compact device has the flat-top passbands of more than 11nm, insertion loss of less than 0.5 dB, and crosstalk of lower than -15 dB with subwavelength gratings.