[1] J. Tan, W. Chen, Y. Zhu, and D. Wang, Acta Photon. Sin. (in Chinese) 35, 228 (2006).
[2] S. Han, S. Zhao, and X. Di, Laser Optoelectron. Prog. (in Chinese) 45, (3) 50 (2008).
[3] H. Yang, X. Li, and W. Jiang, Laser Optoelectron. Prog. (in Chinese) 44, (10) 61 (2007).
[4] P. R. Hoffman and M. G. Kuzyk, J. Lightwave Technol. 22, 494 (2004).
[5] L. Hang, C. He, and B. Wu, Chinese J. Lasers (in Chinese) 34, 820 (2007).
[6] J. Tan, W. Chen, Y. Fu, and Y. Zhu, in Proceedings of International Symposium on Advances and Trends in Fiber Optics and Application 2004 351 (2004).
[7] W. Chen, J. Wu, J. Tan, Q. Hu, Y. Zhu, and P. Zhang, Acta Opt. Sin. (in Chinese) 27, 2128 (2007).
[8] X. Liang, S. Xiong, Y. Hu, Q. Yao, and L. Ma, Chinese J. Lasers (in Chinese) 35, 716 (2008).
[9] Q. Ge, C. Xu, X. Wu, K. Qian, Z. Li, and B. Yu, Chinese J. Lasers (in Chinese) 35, 726 (2008).
[10] T. Omori, K. Hashimoto, and M. Yamaguchi, in Proceedings of IEEE Sensors 2004 583 (2004).