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Signal light monitoring apparatus, optical amplification apparatus and optical reception apparatus, and signal light monitoring method

  • US 8,705,168 B2
  • Filed: 05/21/2012
  • Issued: 04/22/2014
  • Est. Priority Date: 04/27/2007
  • Status: Expired due to Fees
First Claim
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1. An apparatus comprising:

  • an optical amplifier for amplifying an input light by excitation power;

    a control unit controlling feeding of the excitation power to the optical amplifier; and

    a signal light monitoring unit monitoring an input state of a signal light input into the optical amplifier, whereinthe signal light monitoring unit comprises;

    an optical branching unit branching a branched light of light input into the optical amplifier in four directions;

    a polarization component extraction unit extracting four polarization components having mutually different polarization parameters from lights branched in four directions by the optical branching unit; and

    a determination unit determining input/non-input of the signal light based on the four polarization components extracted by the polarization component extraction unit before outputting a result of the determination to the control unit, whereinthe control unit turns on feeding of the excitation power to the optical amplifier when the signal light is being input based on the result of the determination from the determination unit and turns off feeding of the excitation power to the optical amplifier when the signal light is not being input.

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