期刊
JOURNAL OF LIGHTWAVE TECHNOLOGY
卷 21, 期 10, 页码 2429-2433出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2003.817692
关键词
mode-size converter; optical fiber; optical strip waveguides; optical polarization; taper; waveguide couplers
This paper reports modeling and simulation of low-loss coupling between polarization-insensitive silicon-on-insulator (SOI) microwaveguides and single-mode optical fiber, using a two-dimensional taper. The proposed structure is a reduction of both sizes of a square-strip waveguide from a 350 x 350-nm(2) cross section to about 155 x 155-nm(2) cross section. At the output facet, the guided mode is spread out and has a non-Gaussian profile, but low-loss coupling can be achieved by optimizing the overlap integral between the submicrometer waveguide mode and the optical fiber one. The calculated coupling losses are lower than 0.2 dB, the alignment tolerance is larger than 4 mum at +/-1 dB for the coupling losses, and the total length is about 10 mum.
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