| 摘要 |
A noise figure measuring system including a first optical amplifier whose noise figure is to be measured, a plurality of light sources for outputting a plurality of optical signals having different wavelengths, respectively, an optical multiplexer for wavelength division multiplexing the plurality of optical signals output from the light sources to obtain WDM signal light, and a second optical amplifier for amplifying the WDM signal light output from the optical multiplexer. The noise figure measuring system further includes an optical spectrum measuring unit for measuring output signals from the first and second amplifiers, a power deviation detecting unit for detecting a deviation in power between the optical signals of the WDM signal light to be input into the first optical amplifier, and a light source power control unit for controlling the light sources so that the powers of the optical signals of the WDM signal light to be input into the first optical amplifier becomes substantially equal to each other. Measured data obtained by the optical spectrum measuring unit is stored into a memory, and the noise figure of the first optical amplifier is computed by a noise figure computing unit according to the measured data stored in the memory.
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