Patent ID: 7817921
Filing Date: 2010-10-19
Classification: H01S,H04B

Abstract:
1. A method for determining a power of an amplified spontaneous emission in an optical fiber amplifier for a WDM signal, wherein the optical fiber amplifier includes at least a first amplifier stage having a predetermined output power set for a measured input power, and wherein the optical fiber amplifier includes a second amplifier stage connected in series after the first amplifier stage, comprising: determining from the output power a first mean inversion level χ determining a first output power of the amplified spontaneous emission at an output of the first amplifier stage by reference to tabulated values which depend on the first mean inversion level χ setting a second predetermined output power for a known output power from the first amplifier stage, whereby the gain of both amplifiers stages is kept constant so that the first mean inversion level χ calculating the power of an amplified spontaneous emission at an output of the second amplifier stage P S