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Method and apparatus for using optical idler tones for performance monitoring in a WDM optical transmission system

  • US 20040096214A1
  • Filed: 07/03/2003
  • Published: 05/20/2004
  • Est. Priority Date: 08/20/2002
  • Status: Abandoned Application
First Claim
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1. A test system for monitoring a WDM transmission system that employs at least one optical amplifier, comprising:

  • a test signal generator generating an optical test signal;

    an optical coupler combining the test signal with at least one data signal located at a given channel wavelength, said optical test signal being located at one or more channel wavelengths distinct from the given channel wavelength and corresponding to an idler channel wavelength employed to maintain a prescribed operational state of said at least one optical amplifier; and

    an optical performance monitor receiving at least a portion of the optical test signal.

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