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Appl Opt. 2013 Mar 20;52(9):1919-27. doi: 10.1364/AO.52.001919.

Automatic DGD and GVD compensation at 640 Gb/s based on scalar radio-frequency spectrum measurement.

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Centre for Ultrahigh bandwidth Devices for Optical Systems, Institute of Photonics and Optical Science, School of Physics, University of Sydney, New South Wales, Australia.


We demonstrate what we believe to be the first real-time impairment-cancellation system for group-velocity dispersion (GVD) and differential group delay (DGD) for a 640 Gb/s single-channel signal. Simultaneous compensation of two independent parameters is demonstrated by feedback control of separate GVD and DGD compensators using an impairment monitor based on an integrated all-optical radio-frequency (RF) spectrum analyzer. We show that low-bandwidth measurement of only a single tone in the RF spectrum is sufficient for automatic compensation for multiple degrees of freedom using a multivariate optimization scheme.

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