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Optical waveguide device with two predetermined wavelength, polarization independent, directional coupler switches

  • US 5,148,507 A
  • Filed: 07/08/1991
  • Issued: 09/15/1992
  • Est. Priority Date: 07/06/1990
  • Status: Expired due to Fees
First Claim
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1. An optical waveguide device, comprising:

  • a plurality of optical directional coupler switches provided on a substrate, each of said optical directional coupler switches being provided with a pair of parallel waveguides;

    means for applying a voltage across said parallel waveguides; and

    light input and output terminals coupled to said optical directional coupler switches, wherein;

    at least a first one of said optical directional coupler switches operates independently of a polarization of light having a first predetermined wavelength by defining a width of said parallel waveguides and a distance therebetween being equal to first predetermined values, and at least a second one of said optical directional coupler switches operates independently of the polarization of light having a second predetermined wavelength by defining a width of said parallel waveguides and a distance therebetween being equal to second predetermined values, said parallel waveguides of said first and second one of said optical directional coupler switches being provided by diffusing films of the same thickness deposited in a predetermined pattern on said substrate thereinto by a predetermined diffusing condition.

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