作者机构:Key Laboratory of Information Photonics and Optical Communications, Ministry of Education, Beijing University of Posts and Telecommunications, Beijing 100876, China
相关基金:Acknowledgements This work was supported by the Hi-Tech Research and Development Program of China (2009AA01z255), the National Basic Research Program of China (2007CB310705), the National Natural Science Foundation of China (60772024, 60711140087), SRFDP (200800130001), ISTCP (2006DFA11040) and the PCSIRT of China (IRT0609).