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Bilevel mode converter between a silicon nanowire waveguide and a larger waveguide

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

A bilevel mode converter is analyzed for providing low-loss coupling between the small fundamental mode of a silicon nanowire waveguide and the larger mode of a conventional silicon-on-insulator (SOI) rib waveguide. The bilevel converter can also be used to improve the coupling efficiency between a lensed fiber and a silicon nanowire waveguide. The mode converter consists of two tapers formed at different levels. The top taper comprises a parabolic and sine taper, which is optimized to improve the mode conversion efficiency. Numerical analyses are given by using a three-dimensional semivectorial beam propagation method. The design has good tolerance against misalignment of the two masks needed for the double etch.

Published in:

Lightwave Technology, Journal of  (Volume:24 ,  Issue: 6 )

Date of Publication:

June 2006

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