[1] Beijing Univ Posts & Telecommun, State Key Lab Informat Photon & Opt Commun, Beijing 100876, Peoples R China
[2] Beijing Univ Posts & Telecommun, Sch Sci, Beijing 100876, Peoples R China
[3] Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, Key Lab Organ Solids, Zhongguancun North First St 2, Beijing 100190, Peoples R China
[4] Changshu Inst Technol, Sch Elect & Informat Engn, Changshu 211850, Jiangsu, Peoples R China