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Elimination of multimode effects in a silicon-on-insulator etched diffraction grating demultiplexer with bi-level taper structure

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3 Author(s)
Daoxin Dai ; Centre for Opt. & Electromagn. Res., Zhejiang Univ., Hangzhou, China ; Jian-Jun He ; Sailing He

Multimode effects in the free propagation region (FPR) of an etched diffraction grating (EDG) demultiplexer based on silicon-on-insulator are analyzed. The insertion loss and the crosstalk increase due to these undesired multimode effects. A bi-level taper structure between the FPR and the input/output waveguides is proposed. It is shown that such a taper structure can reduce the multimode effects to an almost negligible level. At the same time, the 3-dB passband width is enlarged by increasing the rib width. No additional fabrication process is needed for an EDG with such a design.

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Selected Topics in Quantum Electronics, IEEE Journal of  (Volume:11 ,  Issue: 2 )