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Measuring the in-Band Signal-to-Noise Ratio within Narrow Optical Channels

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Measuring the in-Band Signal-to-Noise Ratio within Narrow Optical Channels

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  • Author: Gang He, Daniel Gariépy, Yves Breton
In first-generation wavelength-division multiplexing (WDM) and dense wavelength-division multiplexing (DWDM) networks, OSNR was usually measured on channels of point-to-point trunk links, or ring-based metro networks, in which each of the multiplexed signal wavelengths generally followed the same optical path (including the same optical amplifiers). Under these conditions, the OSNR could be measured using a straightforward optical spectrum analyzerbased method, known as the interpolation method (standardized in IEC 61280-2-9), which provides a single spectral measurement for all the DWDM channels.

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