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Multi-channel optical filter

  • US 6,844,977 B2
  • Filed: 01/25/2002
  • Issued: 01/18/2005
  • Est. Priority Date: 01/26/2001
  • Status: Expired due to Term
First Claim
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1. An optical communication device, comprising:

  • an optical communication path; and

    a plurality of optical filtering elements coupled to said optical communication path, each of said plurality of filtering elements having a single optical interference filter that includes a plurality of alternating high and low refractive indices and has two passbands, a first passband being configured to add/drop a plurality of optical signals corresponding to an optical payload channel, each of the optical signals being at a respective one of a plurality of wavelengths, the first passband being a approximately 1 nm wide around a first center wavelength within said plurality of wavelengths of said optical signals;

    a second passband of said optical interference filter being configured to add/drop a service channel at a wavelength different than the plurality of wavelengths of the optical signals, the second passband being aproximately 20 nm wide around a second center wavelength corresponding to said service channel wavelength.

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