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Variable-waveguide optical branching filter

  • US 4,874,216 A
  • Filed: 06/23/1988
  • Issued: 10/17/1989
  • Est. Priority Date: 07/02/1987
  • Status: Expired due to Term
First Claim
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1. A variable-wavelength optical branching filter, comprising:

  • two optical waveguides intersecting each other at a predetermined angle, one of the two optical waveguides being employed in use as an input side waveguide for propaging therein incident light, the other of the two optical waveguides being employed as an output side waveguide for obtaining therefrom output light;

    a material having a refractive index variable in response to application of input energy to the same and disposed at an intersection of the two optical waveguides;

    means for applying said input energy to said material to produce the output light at the output side waveguide;

    and a diffraction grating disposed at the intersection of the two optical waveguides for specifying a particular wavelength of the output light by the period of the diffraction grating, and the specified wavelength being variable by changing the refractive index of said material.

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