| 摘要 |
A control apparatus comprises a light monitoring unit (10) for dividing a signal wavelength band into at least a band (41, 43) in which output light power of an optical amplifier (1) tends to decrease at an decrease in the number of signal wavelengths and a band (42) including a gain deviation band, and for monitoring inputted light power for the individual divided bands (41, 42, 43), calculation unit (21) for obtaining the number of signal wavelengths in the individual divided bands (41, 42, 43) based on a monitor result, and a target gain correction unit (22) for correcting a target gain based on a result of the calculation. This suppresses a transient variation of signal light levels due to SHB or SRS at a high speed with a simple configuration without deteriorating noise characteristic, thus enabling optical amplifiers to be further disposed in a multi-stage fashion, which can lengthen the transmission distance of a transmission system including an optical add/drop unit. |
