Waveguide mode expander using amorphous silicon
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United States of America Patent
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Feb 6, 2018
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app pub date -
May 27, 2015
filing date -
May 27, 2014
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Abstract
A waveguide mode expander couples a smaller optical mode in a semiconductor waveguide to a larger optical mode in an optical fiber. The waveguide mode expander comprises a shoulder made of crystalline silicon and a ridge made of non-crystalline silicon (e.g., amorphous silicon). In some embodiments, the ridge of the waveguide mode expander has a plurality of stages, the plurality of stages have different widths and/or thicknesses at a given cross section.
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