[1] C. Qiao and M. Yoo, Journal of High Speed Networks 8, 69 (1999).

[2] A. K. Garg and R. S. Kaler, Chin. Opt. Lett. 6, 244 (2008).

[3] J. Yang, G. Wang, and S. Jia, Chin. Opt. Lett. 5, 325 (2007).

[4] Z. Lan, H. Guo, J. Wu, and J. Lin, Chin. Opt. Lett. 3, 196 (2005).

[5] J. Wu, W. Zhang, and M. Wang, Acta Photon. Sin. (in Chinese) 36, 247 (2007).

[6] F. Farahmand, Q. Zhang, and J. P. Jue, J. Lightwave Technol. 23, 3167 (2005).

[7] S. Huang, K. Long, X. Yang, and Q. Chen, Semiconductor Optoelectronics (in Chinese) 28, 399 (2007).

[8] L. Li, S. D. Scott, and J. S. Deogun, in Proceedings of IEEE GLOBECOM 2003 5, 2809 (2003).

[9] S. K. Lee, K. Sriram, H. S. Kim, and J. S. Song, IEEE J. Sel. Areas Commun. 23, 1596 (2005).

[10] M. Yao, Z. Liu, and A. Wen, J. Lightwave Technol. 23, 2807 (2005).

[11] J. Y. Wei and R. I. McFarland, J. Lightwave Technol. 18, 2019 (2000).

[12] I. Baldine, G. N. Rouskas, H. G. Perros, and D. Stevenson, IEEE Communications Magazine 40, (2) 82 (2002).

[13] Y. Guo, A. Wen, Z. Liu, and Z. Zhang, Acta Photon. Sin. (in Chinese) 36, 1485 (2007).

[14] W. Yuan, W. Liu, and W. Cheng, Acta Electron. Sin. (in Chinese) 36, 51 (2008).

[15] Y. Qiu, Y. Ji, and D. Xu, Proc. SPIE 5625, 698 (2005).