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OPTICAL BRANCHING UNIT, OPTICAL COMMUNICATION SYSTEM, AND OPTICAL MULTIPLEXING METHOD

  • US 20120201543A1
  • Filed: 08/23/2010
  • Published: 08/09/2012
  • Est. Priority Date: 10/16/2009
  • Status: Active Grant
First Claim
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1. An optical branching unit comprising:

  • an optical amplification unit means that, when an optical signal is received as input, amplifies and supplies the optical signal, or, when said optical signal is not received as input, amplifies and supplies amplified spontaneous emission that the optical amplification means itself generates;

    a detection unit means that detects whether said optical signal is applied as input to said optical amplification unit means;

    a control unit means that, when said detection unit means detects that said optical signal is not applied as input to said optical amplification unit means, sets gain that determines the magnitude of amplification in said optical amplification unit means to a predetermined value that is greater than said gain when said optical signal is applied as input to said optical amplification unit means; and

    an add/drop multiplexing unit means that receives output light from said optical amplification unit means and other output light and that multiplexes an optical signal of a predetermined wavelength that is contained in the output light from said optical amplification unit means and an optical signal of a designated wavelength that is contained in said other output light.

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