In this paper, we experimentally investigate the tolerance of 111-Gb/s polarization multiplexed return-to-zero differential quadrature phase-shift keying (POLMUX–RZ–DQPSK) signals with respect to nonlinear impairments in a link with either (inline) optical or (receiver-side) electrical dispersion compensation. After transmission of more than 2000 km of LEAF, a comparable nonlinear tolerance is observed for both dispersion maps. However, we observe that in the presence of differential group delay (DGD) the nonlinear tolerance of the transmission link with in-line optical dispersion compensation is reduced significantly, whereas the nonlinear tolerance of the configuration with receiver-side dispersion compensation is virtually unaffected.
© 2009 IEEE
Mohammad S. Alfiad, Dirk van den Borne, Sander Lars Jansen, Torsten Wuth, Maxim Kuschnerov, Guido Grosso, Antonio Napoli, and Huug de Waardt, "A Comparison of Electrical and Optical Dispersion Compensation for 111-Gb/s POLMUX–RZ–DQPSK," J. Lightwave Technol. 27, 3590-3598 (2009)