Abstract
Abstract We propose an improved optical signal-to-noise ratio (OSNR) monitoring technique in presence of optical fiber nonlinearity-induced distortions, in which traditional multi-order statistical moments based (MOSMB) OSNR monitoring method is corrected by a calibration factor α and correlation functions between neighboring received symbols. This OSNR monitoring technique is performed for the first time in a 224-Gb/s polarization-multiplexed quadrature amplitude modulation (PM-16QAM) system. We explore relationships between α , transmission distances and channel launch powers for further convenient usage considerations. The proposed monitoring technique shows much better performances than existing OSNR monitoring techniques in highly nonlinear systems, where OSNR estimation errors are below 1 dB with actual OSNR ranging 18–28 dB and the channel launch powers reach as highly as 4 dBm and the transmission distances are up to 2000 km. Besides, this proposed technique is applicable to different modulation formats and corresponding performances are compared.
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