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Method of determining the gain characteristic of a distributed Raman amplifier

  • US 20050105167A1
  • Filed: 09/30/2004
  • Published: 05/19/2005
  • Est. Priority Date: 11/13/2003
  • Status: Abandoned Application
First Claim
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1. A method of determining the gain of a Raman amplifier in a fiber optic communication system comprising an optical fiber;

  • the method comprising the steps of launching a pump light signal into said fiber;

    preliminary adjusting the power of said pump light signal to a value that lies in a range where an amplified spontaneous emission noise originating from said pump light signal is substantially proportional to the on/off gain provided by the power of said pump light signal;

    monitoring the power of said amplified spontaneous emission noise signal;

    varying the power of said pump light signal;

    measuring a variation in the power of said amplified spontaneous emission noise signal corresponding to said pump power variation; and

    determining the gain characteristic of said amplifier from the relative variation in pump power and said measured variation in noise power.

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