Two-photon-absorption-based OSNR monitor for NRZ-PSK transmission systems

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Reid, Douglas A. ; Bondarczuk, Krzysztof ; Dexter, Karl J. ; Shi, Kai ; Anandarajah, Prince M. ; Barry, Liam P. ; Guo, Wei Hua ; O'Dowd, John ; Lynch, Michael ; Bradley, Ann Louise ; Donegan, John Francis (2010)

A two-photon absorption microcavity-based technique for monitoring in-band optical signal-to-noise ratio (OSNR) in nonreturn-to-zero phase-shift-keying systems is presented. Experiments using a 10-Gb/s differential phase-shift-keying system showed that accurate measurements ( 1 dB) were possible for OSNRs in excess of 20 dB.
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