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Robust optical signal-to-noise ratio monitoring scheme using a phase-modulator-embedded fiber loop mirror

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Abstract

We propose and experimentally demonstrate a novel in-band optical signal-to-noise ratio (OSNR) monitoring technique using a phase-modulator-embedded fiber loop mirror. This technique measures the in-band OSNR accurately by observing the output power of a fiber loop mirror filter, where the transmittance is adjusted by an embedded phase modulator driven by a low-frequency periodic signal. The measurement errors are less than 0.5dB for an OSNR between 0 and 40dB in a 10Gbits non-return-to-zero system. This technique was also shown experimentally to have high robustness against various system impairments and high feasibility to be deployed in practical implementation.

© 2007 Optical Society of America

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