[1] B. M. Ghaffari and J. A. Salehi, IEEE Trans. Commun. 5, 1424 (2009).

[2] L. S. Chen, G. C. Yang, C. Y. Chang, and W. C. Kwong, J. Lightw. Technol. 21, 3293 (2011).

[3] A. N. Z. Rashed, A. E. A. Mohammed, and O. M. A. Dardeer, Chin. Opt. Lett. 12, 050602 (2014).

[4] H. Chen, S. Xiao, L. Yi, D. Yi, and W. Hu, Chin. Opt. Lett. 9, 100606 (2011).

[5] X. Li, P. Fan, and X. Lei, Chin. Opt. Lett. 8, 884 (2010).

[6] H. Yin, W. Liang, L. Ma, and L. Qin, Chin. Opt. Lett. 7, 102 (2009).

[7] M. M. Karbassian and F. Küppersa, Opt. Switch. Netw. 17, 130 (2012).

[8] C. C. Yang, J. F. Huang, and T. C. Hsu, IEEE Photon. Technol. Lett. 20, 1664 (2008).

[9] C. H. Chen, H. Y. Chu, G. C. Yang, C. Y. Chang, and W. C. Kwong, IEEE Trans. Commun. 5, 1247 (2011).

[10] C. C. Sun, G. C. Yang, C. P. Tu, C. Y. Chang, and W. C. Kwong, IEEE Trans. Commun. 5, 1344 (2010).

[11] E. L. Titlebaum and L. H. Sibul, IEEE Trans. Aerosp. Electron. Syst. 17, 494 (1981).

[12] M. Azizoghlu, J. A. Salehi, and Y. Li, IEEE Trans. Commun. 8, 1162 (1992).