Optical signal-to-noise ratio (OSNR) has long been recognized as a key performance indicator in wavelength-division multiplexing (WDM) networks, because it provides a multichannel assessment of signal quality in a very short time. OSNR also predicts bit error rate (BER) within just a few minutes, while typical BER tests must run for hours or days.Intelligent in-band OSNR measurement for 40 Gbits and ROADM deployments * Automatic impairment identification for faster troubleshooting * Compliant with ITU-T G.697 recommendaton
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