Optical multiplexing and de-multiplexing element and arrayed-waveguide grating-type optical wavelength filter
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United States of America Patent
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Oct 31, 2017
Grant Date -
Aug 10, 2017
app pub date -
Dec 13, 2016
filing date -
Feb 9, 2016
priority date (Note) -
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Abstract
There is provided an optical multiplexing and de-multiplexing element which is provided with a slab waveguide and a waveguide structure and can reduce radiation loss caused in a connection part between the slab waveguide and the waveguide structure. The waveguide structure includes a multimode interference (MMI) waveguide coupler and a narrow-width waveguide, the MMI waveguide coupler and the narrow-width waveguide are connected to each other in this order from a connection position with the slab waveguide along the waveguide direction, step portions are formed on both sides of the MMI waveguide coupler along the waveguide direction, and the thickness of the step portion is smaller than the thickness of the MMI waveguide coupler.
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