作者机构:[1]Tsinghua National Laboratory for Information Science and Technology (TNList), Department of Electronic Engineering, Tsinghua University, Beijing 100084, China
相关基金:This work was supported by the Major State Basic Research Development Program of China ("973" Program) (Grant No.2012CB315703), the Na- tional Natural Science Foundation of China (Grant Nos. 61120106001,61132004 and 60807026), the Program for New Century Excellent Talents in University (NCET-10-0520), Open Fund of Key Laboratory of Optical Connnunication and Lightwave Technologies (Beijing University of Posts and Telecommunications).