title: Automatic DGD and GVD compensation at 640 Gb/s based on scalar radio-frequency spectrum measurement.
abstract: 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.
authors.affiliation: Centre for Ultrahigh bandwidth Devices for Optical Systems, Institute of Photonics and Optical Science, School of Physics, University of Sydney, New South Wales, Australia. yvan@physics.usyd.edu.au
authors.forename: Yvan
authors.initials: Y
authors.lastname: Paquot
authors.forename: Jochen
authors.initials: J
authors.lastname: Schröder
authors.forename: Evarist
authors.initials: E
authors.lastname: Palushani
authors.forename: Richard
authors.initials: R
authors.lastname: Neo
authors.forename: Leif K
authors.initials: LK
authors.lastname: Oxenløwe
authors.forename: Steve
authors.initials: S
authors.lastname: Madden
authors.forename: Duk-Yong
authors.initials: DY
authors.lastname: Choi
authors.forename: Barry
authors.initials: B
authors.lastname: Luther-Davies
authors.forename: Mark D
authors.initials: MD
authors.lastname: Pelusi
authors.forename: Benjamin J
authors.initials: BJ
authors.lastname: Eggleton