Abstract
In this work, a silicon TM mode multiplexer based on three waveguide directional coupler constructed by subwavelength gratings (SWG) is proposed. The working bandwidth is greatly increased by using the SWG waveguides and a mode block based on SWG is added to reduce the crosstalk. FDTD simulation results show that the insertion loss and crosstalk at 1550 nm are 0.7 dB and −35.9 dB respectively. Large working bandwidth of 270 nm (1400 nm∼1670 nm) can be achieved under the conditions of less than 3 dB insertion loss and −15 dB crosstalk. In addition, the fabrication tolerance of the proposed device is also investigated.
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