MODE SIZE CONVERTER AND OPTICAL DEVICE HAVING THE SAME
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United States of America Patent
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app pub date -
Jan 25, 2016
filing date -
Dec 4, 2015
priority date (Note) -
Abandoned
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Abstract
Mode size converter includes a first coupler having a signal waveguide that has a first inverse taper portion and an intermediate waveguide that overlaps the first inverse taper portion. The intermediate waveguide has a refractive index that is less than a refractive index of the signal waveguide. The mode size converter also include a second coupler having the intermediate waveguide and an overlay waveguide. The intermediate waveguide has a second inverse taper portion. The overlay waveguide overlaps the second inverse taper portion. The overlay waveguide has a refractive index that is less than the refractive index of the intermediate waveguide. The first and second couplers are configured to change a mode size of light propagating through the mode size converter. The mode size of the light through the overlay waveguide is configured to match a mode size of a single-mode fiber.
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