Apparatus for monitoring optical signal-to-noise ratio

摘要: Disclosed is an apparatus for monitoring optical signal-to-noise ratio in a WDM network. The includes orthogonal polarization component module receiving signal and outputting it after removing thereof at specific frequency band; calculation means measuring both average noise intensity of the outputted from module. By bandwidth passing only through, possible to easily measure within that cannot be measured general. A band set bandwidth, minimized band, so even whose amplified spontaneous emission spectrum not flat, irrespective pattern length.