Noise figure-measuring device and noise figure-measuring method

摘要

Output light spectrum P2(. g. ) data from an optical amplifier and input light spectrum P1(. g. ) data of signal light are prepared, the difference between the P2(. g. ) and a value obtained by multiplying the P1(. g. ) by a provisional gain GT is determined (Steps S232), for the obtained spectrum data, a noise removing process such as a moving average process and the like is performed and then, a spline interpolation process is also performed, whereby ASE light spectrum P3(. g. ) data is prepared and an ASE light level P ASE is determined (Steps S233 through S235). In addition, a noise figure-measuring device 10 calculates the number of channels of WDM light and signal light wavelengths of the respective channels based on the P1(. g. ) or P2(. g. ), and performs analysis to calculate a noise figure NF and the like of an appointed wavelength range around the center of each wavelength thus calculated.