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Mode insensitive waveguide device

  • US 5,212,759 A
  • Filed: 12/16/1991
  • Issued: 05/18/1993
  • Est. Priority Date: 12/16/1991
  • Status: Expired due to Term
First Claim
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1. An optical device, comprising:

  • a waveguide having a film, said film having a first film and a second film boundary spaced from said first film boundary, said waveguide internally reflecting an electromagnetic wave at said film boundaries, said wave being characterized by a projected wave vector, β

    , on a z axis, where ##EQU3## and where λ

    is the wavelength of light, nw is the waveguide refractive index, and φ

    m represents the propagation angles supported by said waveguide for defined modes, m, so that an effective refractive index, Nwm, of said waveguide is a function of φ and

    nw where
    
    
    space="preserve" listing-type="equation">N.sub.m =n.sub.w sin φ

    .sub.m ; and

    an overlay material positioned on said waveguide film and having a higher refractive index than said waveguide so that the ratio of the effective refractive indexes is substantially constant for all propagation angles, φ

    m, supported by said waveguide.

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