Two dimensional silicon waveguide chirped grating couplers for vertical optical fibers
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AbstractShallow etched two dimensional gratings for coupling light between silicon-on-insulator nanophotonic waveguides and vertical optical fibers were designed and experimentally characterized. We show that the large second order back reflection could be suppressed effectively by applying a linear chirp in the grating period for two dimensional grating couplers. The total coupling efficiency from an optical fiber to two orthogonal silicon waveguides is independent of the input polarization. An almost linear relationship between the average effective index of the grating region and the fill factor for 10 grating is obtained and verified. We also show that the average effective index for the two dimensional grating is similar to the one dimensional grating with the same fill factor in the light propagation direction, when the fill factor of the etched holes was larger than 0.5. (C) 2010 Elsevier B.V. All rights reserved.
All Author(s) ListChen X, Li C, Tsang HK
Journal nameOptics Communications
Volume Number283
Issue Number10
Pages2146 - 2149
LanguagesEnglish-United Kingdom
KeywordsCoupler; Integrated optics; Silicon-on-insulator; Waveguide grating
Web of Science Subject CategoriesOptics; OPTICS

Last updated on 2020-28-11 at 23:13