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Opt Express. 2012 Dec 17;20(27):28724-33. doi: 10.1364/OE.20.028724.

Optical performance monitoring for OFDM using low bandwidth coherent receivers.

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Victoria Research Laboratory, NICTA Ltd., Level 2, Building 193, Electrical and Electronic Engineering, University of Melbourne, Australia.


We propose using low bandwidth coherent receivers for distributed optical performance monitoring. We demonstrate optical signal-to-noise ratio (OSNR) monitoring of both 20-Gb/s single-polarization and 40-Gb/s polarization-multiplexed coherent optical orthogonal frequency-division multiplexing (CO-OFDM) signals with a 0.8-GHz receiver using both data-aided (DA) and non-data-aided (NDA) approaches. The sampling rate of the performance monitor is much lower than the signal baud rate, so provides a cost-effective solution for distributed optical performance monitoring. The proposed method is demonstrated experimentally and through simulation. The results show that after calibration the OSNR monitoring error is less than 1 dB and the two approaches are not affected by fiber dispersion after 800-km transmission and 30-ps differential group delay (DGD).

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