This article [Opt. Eng. 51, 045008 (2012)] was originally published on 30 April with Figs. 4 and 5 reversed. The corrected figures and captions appear below.
Effect of DGD on DQPSK signals.
Different constellations obtained at different times (15-ps CD).
This article was corrected online on 7 May 2012. It appears correctly in print.