[1] [1] C. Dorrer, C. R. Doerr, I. Kang, R. Ryf, J. Leuthold, and P. J. Winzer, J. Lightwave Technol. 23, 178 (2005).

[2] [2] S. Diez, R. Ludwwig, C. Schmidt, U. Feiste, and H. G. Weber, IEEE Photon. Technol. Lett. 11, 1402 (1999).

[3] [3] S. Kawanishi, T. Yamamoto, M. Nakawawa, and M. M. Fejer, Electron. Lett. 37, 842 (2001).

[4] [4] J. Li, J. Hansryd, P. O. Hedekvist, P. A. Andrekson, and S. N. Knudsen, IEEE Photon. Technol. Lett. 13, 987 (2001).

[5] [5] S. Nogiwa, H. Ohta, Y. Kawaguchi, and Y. Endo, Electron. Lett. 35, 917 (1999).

[6] [6] C. Schmidt-Langhorst and H.-G. Weber, J. Opt. Fiber Commun. Rep. 2, 86 (2005).

[7] [7] M. Shirane,Y. Hashimoto, H. Yamada, and H. Yokoyama, IEICE Trans. Electron. E87-C, 1173 (2004).

[8] [8] N. Yamada, S. Nogiwa, and H. Ohta, IEEE Photon. Technol. Lett. 16, 1125 (2004).

[9] [9] D. Tang, J. Zhang, Y. Liu, and W. Zhao, Chin. Opt. Lett. 8, 630 (2010).

[10] [10] M. Westlund, H. Sunnerud, M. Karlsson, and P. A. Andrekson, J. Lightw. Technol. 23, 1088 (2005).

[11] [11] G. Moustakides, F. Cerou, O. Audouin, and L. Noirie, in Proceedings of 11th European Signal Processing Conference 375 (2002).

[12] [12] J. Li, M. Westlund, H. Sunnerud, B.-E. Olsson, M. Karlsson, and P. Andrekson, IEEE Photon. Technol. Lett. 16, 566 (2004).

[13] [13] G. P. Agrawal, "Nonlinear Fiber Optics" (Academic Press Inc., San Diego, 1995) chap.3.