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Grating coupler

  • US 5,033,812 A
  • Filed: 02/16/1990
  • Issued: 07/23/1991
  • Est. Priority Date: 02/17/1989
  • Status: Expired due to Term
First Claim
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1. A grating coupler comprising an optical waveguide and a grating formed on said optical waveguide in which light is propagated for optically coupled light rays inside and outside of said optical waveguide, wherein the coupling coefficient of said grating coupler is gradually changed in the direction of propagation of guided light in said optical waveguide, wherein the width of said optical waveguide is tapered in the direction of propagation of the guided light therein so that the narrowest portion of said optical waveguide is positioned at one end of said grating and the widest portion thereof is positioned at the other end of said grating.

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