Site-line calibration method may be configured to wavelength-dependent attenuation, apparatus and system for

The present invention is applicable to the field of communications, there is provided a method of online calibration site may be configured to wavelength-dependent attenuation, apparatus and optical communication system. The method comprising: obtaining a single-wave optical power of the emission to be calibrated emission wavelength end of the optical amplifier emitted; of configurable site wavelength through configuration, so to be calibrated wavelengths of light through configurable station arrive at the receiving end of the optical amplifier, and the detection reaches the receiving end of the optical wave incident optical power of the optical amplifier; be calibrated according to the single-wave wavelength of the outgoing light power to the optical amplifier reach the receiver of the incident light wave power, to obtain a wavelength-dependent attenuation of the wavelength to be calibrated. This method can be informed and updated in real time WDL, and then update the status of the network to ensure high-quality communication quality in the beginning stages and network expansion phase. Further, the present invention can be fully realized based on the existing network environment wavelength dependent attenuation line calibration without additional hardware, to effectively control the increase in cost.