Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Mitsunobu Gotoda0
Toshiaki Koike-Akino0
Keisuke Kojima0
Mohammad Tahersima0
Date of Patent
February 16, 2021
Patent Application Number
16260747
Date Filed
January 29, 2019
Patent Citations Received
Patent Primary Examiner
Patent abstract
A grating coupler having first and second ends for coupling a light beam to a waveguide of a chip includes a substrate configured to receive the light beam from the first end and transmit the light beam through the second end, the substrate having a first refractive index n1, a grating structure having curved grating lines arranged on the substrate, the grating structure having a second refractive index n1, wherein the curved grating lines have line width w and height d and are arranged by a pitch Λ, wherein the second refractive index n2 is less than first refractive index n1, and a cladding layer configured to cover the grating structure, wherein the cladding layer has a third refractive index n3.
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