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Journal of Lightwave Technology

Journal of Lightwave Technology

| A JOINT IEEE/OSA PUBLICATION

  • Vol. 24, Iss. 6 — Jun. 1, 2006
  • pp: 2428–

Bilevel Mode Converter Between a Silicon Nanowire Waveguide and a Larger Waveguide

Daoxin Dai, Sailing He, and Hon-Ki Tsang

Journal of Lightwave Technology, Vol. 24, Issue 6, pp. 2428- (2006)


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Abstract

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.

© 2006 IEEE

Citation
Daoxin Dai, Sailing He, and Hon-Ki Tsang, "Bilevel Mode Converter Between a Silicon Nanowire Waveguide and a Larger Waveguide," J. Lightwave Technol. 24, 2428- (2006)
http://www.opticsinfobase.org/jlt/abstract.cfm?URI=jlt-24-6-2428


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