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Wavelength selective optical devices using optical directional coupler

  • US 4,900,119 A
  • Filed: 04/01/1988
  • Issued: 02/13/1990
  • Est. Priority Date: 04/01/1988
  • Status: Expired due to Term
First Claim
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1. A wavelength selective optical device, comprising:

  • a first input port,a first output port, anda first 3 dB optical directional coupler which introduces π

    /2 phase shift on light crossover, connecting the said first input and the said first output ports, and wavelength selective resonance circuit means connected symmetrically to the said first 3 dB optical directional coupler, the said resonance circuit means comprising wavelength selecting means capable of reflecting back light having resonant wavelengths and transmitting through light having all other wavelengths so that when singularly polarized light is applied to the said first input port, the light having the said resonant wavelengths and being reflected back from the said wavelength selecting means propagates to the said first output port.

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