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Optical drop apparatus, optical add apparatus, and optical add/drop apparatus

  • US 9,520,959 B2
  • Filed: 09/23/2013
  • Issued: 12/13/2016
  • Est. Priority Date: 11/28/2012
  • Status: Active Grant
First Claim
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1. An optical drop apparatus comprising R routes (R is an integer of 2 or more) and coherent transponders available to simultaneously receive optical signals, the optical drop apparatus comprising:

  • R wavelength separation units corresponding to the respective routes, each of which divides a wavelength multiplexed optical signal of one route into M wavelength groups, each of which includes N wavelengths, each of the coherent transponders being available to simultaneously receive optical signals with N wave lengths (N is an integer of 2 or more and M is an integer satisfying N×

    M=the number of multiplexed wavelengths of the wavelength multiplexed optical signal); and

    M wavelength separation blocks, each of which is input with a plurality of the wavelength groups divided by the different wavelength separation units and outputs optical signals having any one or a plurality of wavelengths included in the input wavelength groups to N coherent transponders, each of M wavelength separation blocks reducing the maximum number R×

    N of wavelengths dropped from the R routes to the maximum number N of wavelengths simultaneously received by one of the coherent transponders,wherein N is equal to the number of the coherent transponders per wavelength separation block and is equal to the number of the wavelengths available to be simultaneously received by each coherent transponder.

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