[1] [1] L. P. Hou Li, W. Wang and H. L. Zhu, Optoelectron. Lett. 1,83 (2005).

[2] [2] Y.-J. Chiu, H.-F. Chou, V. Kaman, P. Abraham and J. E.Bowers, IEEE Photon. Technol. Lett. 14, 792 (2002).

[3] [3] S. Irmscher, R. Lewen and U. Eriksson, IEEE Photon.Technol. Lett. 14, 923 (2002).

[4] [4] J. Lim, Y.-S. Kang, K.-S. Choi, J.-H. Lee, S.-B. Kim and J.Kim, IEEE J. Lightw. Technol. 21, 3004 (2003).

[5] [5] R. Lewén, S. Irmscher and U. Eriksson, IEEE Trans. Microwave Theory Technol. 51, 1117 (2003).

[6] [6] R. Lewén, S. Irmscher, U. Westergren, L. Thylén and U.Erikssons, IEEE J. Lightw. Technol. 22, 172 ( 2004).

[7] [7] G. L. Li, T. G. B. Mason and P. K. L. Yu, IEEE J. Lightw.Technol. 22, 1789 ( 2004).

[8] [8] Y. Tang, Y. Yu, Y. Ye, U. Westergren and S. He., Opt.Commun. 281, 5177 (2008).

[9] [9] K. Abedi, V. Ahmadi, E. Darabi, M. K. Moravvej-Farshiand M. H. Sheikhi, Solid State Electron. 53, 312 (2008).

[10] [10] K. Abedi, Eur. Phys. J. Appl. Phys. 56, 10403 (2011).

[11] [11] K. Abedi, V. Ahmadi and M. K. Moravvej-Farshi, Opt. Quant. Electron. 41, 719 (2009).