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Measuring OSNR In Wdm Systems-Effects of Resolution Bandwidth and Optical Rejection Ratio

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Measuring OSNR In Wdm Systems-Effects of Resolution Bandwidth and Optical Rejection Ratio

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  • Author: Daniel Gariépy, Gang He
In the last few years, we have witnessed the extensive deployment of wavelength-division multiplexed (WDM) networks. These systems are configured to allow multiple channels at different wavelengthsi to share the same optical fiber, increasing the effective transmission rate on that fiber. But with this new technology arose a new challenge: the parameters providing direct information on system performance (such as the bit error rate (BER) and BER estimation techniques like Q-factor or eye analysis) cannot be measured directly on a multichannel system. These key parameters require spectral demultiplexing prior to making an individual evaluation of the BER performance on each demultiplexed channel. Alternatively, optical signalto-noise ratio (OSNR) can be derived, for each individual channel, from an optical spectrum measurement to obtain indirect information about the performance of these channels and hence of the system.

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