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Optical branching unit and optical branching method

  • US 9,544,086 B2
  • Filed: 06/28/2013
  • Issued: 01/10/2017
  • Est. Priority Date: 07/02/2012
  • Status: Active Grant
First Claim
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1. An optical branching device comprising:

  • an optical add-drop circuit that outputs a first input wavelength division multiplexing (WDM) signal to any of a plurality of paths on a per-wavelength basis;

    a light wavelength detector that detects a wavelength of the first WDM signal;

    a wavelength database storing, on a per-wavelength basis, information about one or more sections through which an optical signal contained in the first WDM signal passes, the sections being external to the optical branching device and coupled with the optical branching device; and

    a controller configured to change a setting of the optical add-drop circuit so that a path of an optical signal of a wavelength passing through a particular one of the sections bypasses the particular section when every wavelength stored in the wavelength database for the particular section is not detected in the particular section by the light wavelength detector.

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