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A double-layer grating design particularly suitable for triplexers is presented. It consists of two silicon-on-insulator planar waveguide gratings, where the upper grating is used to couple and split 1310 and 1490 nm signal, and transmits along the opposite direction. The coupling efficiency is about 88 and 84%. The crosstalk can reach up to -21 and -11 dB. However, the 1550 nm signal light almost...
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