[1] R. Lang, IEEE J. Quantum Electron. 18, 976 (1982).

[2] L. L. Li, IEEE J. Quantum Electron. 30, 1701 (1994).

[3] J. Wang, M. K. Haldar, L. Li, and F. V. C. Mendis, IEEE Photon. Technol. Lett. 8, 34 (1996).

[4] C. Henry, N. Olsson, and N. Dutta, IEEE J. Quantum Electron. 21, 1152 (1985).

[5] E. K. Lau, H. K. Sung, and M. C. Wu, IEEE J. Quantum Electron. 44, 90 (2008).

[6] A. Murakami, K. Kenta, and A. Kazuhiko, IEEE J. Quantum Electron. 39, 1196 (2003).

[7] X. Zhao and C. J. Chang-Hasnain, IEEE Photon. Technol. Lett. 20, 395 (2008).

[8] P. Guo, W. Yang, D. Parekh, A. Xu, Z. Chen, and C. J. Chang-Hasnain, Opt. Express 20, 6980 (2012).

[9] P. Guo, W. Yang, D. Parekh, C. J. Chang-Hasnain, A. Xu, and Z. Chen, Opt. Express 21, 3125 (2013).

[10] E. K. Lau, L. J. Wong, and M. C. Wu, IEEE J. Sel. Top. Quantum Electron. 15, 618 (2009).

[11] P. Guo, C. Zhang, J. Li, W. Yang, D. Parekh, C. J. Chang-Hasnain, W. Hu, A. Xu, and Z. Chen, Chin. Opt. Lett. 10, 091407 (2012).

[12] P. Guo, T. Sun, W. Yang, D. Parekh, C. Zhang, X. Xie, C. J. Chang-Hasnain, A. Xu, and Z. Chen, Opt. Express 21, 22114 (2013).

[13] P. Guo, C. Zhang, A. Xu, and Z. Chen, Opt. Express 21, 7276 (2013).

[14] E. K. Lau, X. Zhao, H. K. Sung, D. Parekh, C. J. Chang-Hasnain, and M. C. Wu, Opt. Express 16, 6609 (2008).

[15] A. Ng’oma, D. Fortusini, D. Parekh, W. Yang, M. Sauer, S. Benjamin, W. Hofmann, M. C. Amann, and C. J. Chang-Hasnain, J. Lightwave Technol. 28, 2436 (2010).

[16] H. K. Sung, X. Zhao, E. K. Lau, D. Parekh, C. J. Chang-Hasnain, and M. C. Wu, IEEE J. Sel. Top. Quantum Electron. 15, 572 (2009).

[17] P. Guo, L. Zhu, A. Xu, and Z. Chen, in Proceedings of Opto Electronics and Communications Conference TuPK-9 (2013).