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Variable optical coupler

  • US 3,976,358 A
  • Filed: 07/09/1975
  • Issued: 08/24/1976
  • Est. Priority Date: 08/08/1974
  • Status: Expired due to Term
First Claim
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1. A semiconductive double heterostructure optical waveguide coupler comprising:

  • a first layer of semiconductive material having first and second major surfaces;

    a second layer of semiconductive material on said first major surface;

    a third layer of semiconductive material on said second major surface, said first layer having an index of refraction higher than said second and third layers;

    a plurality of channels of semi-insulating material forming coupled optical waveguides, said channels extending through said first and second layers; and

    means for applying a reverse bias across said first, second and third layers to produce a depletion region which alters the optical coupling between said waveguides.

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