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Method and apparatus for controlling a variable optical attenuator in an optical network

  • US 20040109661A1
  • Filed: 05/19/2003
  • Published: 06/10/2004
  • Est. Priority Date: 12/05/2002
  • Status: Active Grant
First Claim
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1. A method for controlling attenuation for a variable optical attenuator (VOA) inserted in an optical path of an optical signal propagating in an optical network, the method comprising the steps of:

  • measuring power of the optical signal {Pmeas} at the VOA;

    comparing the measured power {Pmeas) with a target power {Ptarget}; and

    if the measured power {Pmeas} differs from the target power {Ptarget}, changing the attenuation of the VOA in one or more variable size intervals (VSI) so that the power of the optical signal substantially equals to the target power {Ptarget}, the size of the variable interval being a function of the {Pmeas} and {Ptarget}.

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