[1] [1] WEI Zhi-hu, WANG Rong, FANG Tao, PU Tao, SUN Guo-dan and ZHENG Ji-lin, Journal of Optoelectronics ·Laser 24, 1086 (2013). (in Chinese)

[2] [2] ZHANG Cheng, YAN Lian-shan, PAN Wei, LUO Bin, ZOU Xi-hua, JIANG Heng-yun, LU Bing and ZHOU Tao, Journal of Optoelectronics·Laser 24, 1662 (2013). (in Chinese)

[3] [3] Liwei Li, Thomas X. H. Huang and Robert Minasian, IEEE Photonics Technology Letters 26, 82 (2014).

[4] [4] Xinhuan Feng, C. Lu, H. Y. Tam and P. K. A. Wai, IEEE Photonics Technology Letters 19, 1334 (2007).

[5] [5] Xinhuan Feng, Hwa-yaw Tam and P. K. A. Wai, Optics Express 14, 8205 (2006).

[6] [6] Junqiang Zhou, Songnian Fu, Feng Luan, Jia Haur Wong, Sheel Aditya, Perry Ping Shum and Kenneth Eng Kian Lee, Journal of Lightwave Technology 29, 3381 (2011).

[7] [7] Javier Abreu-Afonso, Antonio Díez, Jose Luis Cruz and Miguel V. Andrés, IEEE Photonics Technology Letters 24, 2129 (2012).

[8] [8] Yang Jiang, Perry Ping Shum, Peng Zu, Junqiang Zhou, Guangfu Bai, Jing Xu, Zhuya Zhou, Hengwen Li and Shunyan Wang, IEEE Photonics Journal 5, 5500509 (2013).

[9] [9] Thomas X. H. Huang, Xiaoke Yi and Robert A. Minasian, Optics Express 19, 6231 (2011).

[10] [10] Jun Wang, Fei Zeng and Jianping Yao, IEEE Photonics Technology Letter 17, 2176 (2005).

[11] [11] Fei Zeng and Jianping Yao, Journal of Lightwave Technology 23, 1721 (2005).

[12] [12] Young-Geun Han, Gilhwan Kim, Ju Han Lee, Sang Hyuck Kim and Sang Bae Lee, IEEE Photonics Technology Letters 17, 989 (2005).