Wavelength selective optical devices using optical directional coupler
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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Abstract
New types of narrowband wavelength selective optical devices are described. Various configurations are possible, according to the invention, that perform as narrowband wavelength selective transmission or reflection filters or as narrowband wavelength selective optical taps or combiners. The optical devices of the invention include a 3 dB optical directional coupler and wavelength selecting elements such as Bragg reflection gratings or Fabry-Perot resonators usually positioned in optical symmetry with respect to the directional coupler. Two or more wavelength selecting elements can be used to obtain desired filtering characteristics.
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Citations
10 Claims
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1. A wavelength selective optical device, comprising:
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a first input port, a first output port, and a 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification