Optical signal performance monitoring apparatus and method in multi-channel optical transmission system

摘要

An optical signal performance monitoring apparatus in a multi-channel optical transmission system and a method for monitoring the optical signal performance are provided. To achieve the above objective, the optical signal performance monitoring apparatus in the multi-channel optical transmission system includes; an optical input unit for controlling the spot size of an inputted multi-channel optical signal and generating the 1^st multi-channel beam; an optical collimation and focusing unit for collimating the 1^st multi-channel beam and focusing the 2^nd multi-channel beam which is divided by wavelength; a diffraction and reflection unit for diffracting and reflecting the 1^st collimated multi-channel beam, and generating the 2^nd multi-channel beam which is divided by wavelength and is in parallel with the 1^st collimated multi-channel beam; an optical detection unit for measuring the intensity of the 2^nd multi-channel beam by wavelength, which is focused by wavelength by the optical collimation and focusing unit. The optical signal performance monitoring apparatus can measure the intensity, the a wavelength and the optical signal-to-noise ratio of the multi-channel optical signal by channel simultaneously in real time. In addition, since the optical signal performance monitoring can minimize the impact caused by an aberration and maintain the same f-number in the optical system, a high resolving power and a high dynamic range are guaranteed.