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Use of waveguide grating couplers in an optical mux/demux system

  • US 7,194,166 B1
  • Filed: 08/26/2005
  • Issued: 03/20/2007
  • Est. Priority Date: 08/26/2004
  • Status: Active Grant
First Claim
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1. An optical multiplexing/demultiplexing system comprising a plurality of waveguide grating couplers on a substrate and an optical port,where the plurality of waveguide grating couplers are in the same optical path as light in the optical port, and are configured to couple light between a plurality of planar waveguides on the substrate and the optical port,the optical port contains signals propagating on a plurality of wavelengths,a first subset of the plurality of waveguide grating couplers is tuned to primarily couple light to/from a first subset of the plurality of wavelengths,one of the plurality of waveguide grating couplers is tuned to primarily couple one wavelength of light from the optical port,said optical multiplexing/demultiplexing system further comprising a plurality of photodetectors,where the one wavelength of light coupled to one of the plurality of waveguide grating couplers is coupled to one of the plurality of photodetectors, andsaid optical multiplexing/demultiplexing system further comprising a mirror disposed on top of the one of the plurality of photodetectors,where the mirror substantially blocks incident light from impinging on top of the one photodetector.

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