Tanimura, Takahito; Oda, Shoichiro; Tanaka, Toshiki (Fujitsu Laboratories Ltd., 1-1, Kamikodanaka 4-chome, Nakahara-ku, Kawasaki, 211-8588, Japan)
Hoshida, Takeshi; Rasmussen, Jens C. (Fujitsu Limited)
Tao, Zhenning (Fujitsu R&D Center, No. 56 Dong Si Huan Zhong Rd., Beijing, 100025, China)
A skew compensator is proposed and experimentally demonstrated for coherent front-end, which improved tolerance from ±3 to ±21ps at 0.2dB Q-penalty even with 21,000ps/nm CD and 90ps DGD on 112Gb/s DP-QPSK receiver.