200-Gb/s, 430-km PDM-DQPSK Transmission with Endless Polarization Tracking
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B. Koch, R. Noé, V. Mirvoda, D. Sandel, V. Filsinger, K. Puntsri, 40-krad/s Polarization Tracking in 200-Gb/s PDM-RZ-DQPSK Transmission over 430 km,
IEEE Photonics Technology Letters, VOL. 22, No. 9, pp. 613-615, May 1, 2010