Patent ID: 7612936
Filing Date: 2009-11-03
Classification: H01S,H04B,H04J

Abstract:
1. An optical amplifying apparatus for amplifying wavelength division multiplexed signals, comprising: an optical amplifying unit amplifying an input light; an input branching unit branching the input light; an optical filter passing a specific wavelength of the branched light; a specific wavelength measuring unit measuring a power of filtered light; a total power measuring unit measuring a total light power of the branched light; and a control unit controlling the optical amplifying unit based on the power of the filtered light and the total light power measured by the specific wavelength measuring unit and the total power measuring unit, respectively, wherein the control unit determines whether a change of the output light is caused by a loss of transmission path or a change in wavelength number by comparing a first change of the power of the filtered light with a second change of the total light power.