[1] T. Wang, S. Lan, J. Jiang, and T. Liu, Chin. Opt. Lett. 6, 812 (2008).
[2] W. Xu, G. Duan, G. Fang, L. Xi, and X. Zhang, Acta Opt. Sin. (in Chinese) 28, 226 (2008).
[3] B. L. Heffner, IEEE Photon. Technol Lett. 4, 1066 (1992).
[4] C. D. Poole, N. S. Bergano, R. E. Wagner, and H. J. Schulte, J. Light wave Technol. 6, 1185 (1988).
[5] C. D. Poole and D. L. Favin, J. Lightwave Technol. 12, 917 (1994).
[6] N. Gisin, R. Passy, and J. P. Von der Weid, IEEE Photon. Technol. Lett. 6, 730 (1994).
[7] G. D. Van Wiggeren, A. R. Motamedi, and D. M. Baney, IEEE Photon. Technol. Lett. 15, 263 (2003).
[8] J. Jiang, S. Sundhararajan, D. Richards, S. Oliva, and R. Hui, Opt. Express 16, 14057 (2008)
[9] A. Galtarossa, G. Gianello, C. G. Someda, and M. Schiano, J. Lightwave Technol. 14, 42 (1996).
[10] R. M. Jopson, L. E. Nelson, and H. Kogelnik, IEEE Photon. Technol. Lett. 11, 1153 (1999).
[11] R. A. Chipman, in Handbook of Optics (2nd edn.) M. Bass, (ed.) (McGraw-Hill, New York, 1995) chap. 22.
[12] A. De Martino, Y.-K. Kim, E. Garcia-Caurel, B. Laude, and B. Drevillon, Opt. Lett. 28, 616 (2003).
[13] R. Noe, B. Koch, V. Mirvoda, and D. Sandel, in Proceedings of Optical Fiber Communication Conference /National Fiber Optic Engineers Conference OThJ1 (2010).
[14] X. S. Yao, L. Yan, and Y. Shi, Opt. Lett. 30, 1324 (2005).
[15] X. S. Yao, X. Chen, and L. Yan, Opt. Lett. 31, 1948 (2006).
[16] R. Huber, D. C. Adler, and J. G. Fujimoto, Opt. Lett. 31, 2975 (2006).