| 摘要 |
Output light spectrum P 2 (lambda) data from an optical amplifier and input light spectrum P 1 (lambda) data of signal light are prepared, the difference between the P 2 (lambda) and a value obtained by multiplying the P 1 (lambda) by a provisional gain GT is determined (Steps S 232 ), 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 P 3 (lambda) data is prepared and an ASE light level P ASE is determined (Steps S 233 through S 235 ). 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 P 1 (lambda) or P 2 (lambda), 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.
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