| 摘要 |
An SNR calculation method having the steps of measuring the wavelength characteristic of a dynamic range in an optical spectrum measurement apparatus for each wavelength in a multiplexed wavelength range and storing the wavelength characteristic in a storage unit, measuring the signal level and the noise level of a measured optical signal wavelength, reading the noise level of the wavelength of the measured optical signal produced by each of other optical signal wavelengths multiplexed on the measured optical signal wavelength from the storage unit, subtracting the noise level read from the storage unit from the noise level of the measured optical signal wavelength to provide the corrected noise level, and calculating the SNR of the measured optical signal from the measured optical signal level and the corrected noise level.
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