About author:Fan Zhang (fzhang@pku.edu.cn) received his PhD degree in electromagnetic fields and microwave technology from Beijing University of Posts and Telecommunications in 2002. From 2002 to 2004, he was a senior research associate at City University, Hong Kong. From 2004 to 2006, he was a Humboldt Research Fellow at Fachgebiet Hochfrequenztechnik, Technische Universit?t, Berlin. Since May 2006, he has been an associate professor at the School of Electronics Engineering and Computer Science, Peking University. His current research interests include long-haul optical transmission and photonic networking technologies, especially coherent optical communication and digital signal processing. He has published more than sixty academic articles in peer-reviewed international journals. Dr. Zhang is a senior member of IEEE and a member of the Optical Society of America.