[1] G.-K. Chang, J. Yu, Y.-K. Yeo, A. Chowdhury, and Z. Jia, Proc. IEEE 94, 892 (2006).

[2] J. Zhang, N. Chi, P. V. Holm-Nielsen, C. Peucheret, and P. Jeppesen, Electron. Lett. 39, 388 (2003).

[3] J. Zhang, N. Chi, P. V. Holm-Nielsen, C. Peucheret, and P. Jeppesen, IEEE Photon. Technol. Lett. 15, 984 (2003).

[4] J. Zhang, N. Chi, P. V. Holm-Nielsen, C. Peucheret, and P. Jeppesen, IEEE Photon. Technol. Lett. 15, 1174 (2003).

[5] N. Chi, L. Xu, J. Zhang, P. V. Holm-Nielsen, C. Peucheret, Y. Geng, and P. Jeppesen, IEEE Photon. Technol. Lett. 17, 1325 (2005).

[6] E. N. Lallas, N. Skarmoutsos, and D. Syvridis, IEEE Photon. Technol. Lett. 14, 1472 (2002).

[7] L. Wei, X. Xin, and C. Yu, Proc. SPIE 6783, 678342 (2007).

[8] K. G. Vlachos, I. T. Monroy, A. M. J. Koonen, C. Peucheret, and P. Jeppesen, IEEE Commun. Mag. 41, 31 (2003).

[9] J. Yu, G.-K. Chang, and O. Akanbi, J. Lightwave Technol. 24, 271 (2006).

[10] X. Liu, X. Wei, Y. Su, J. Leuthold, Y.-H. Kao, I. Kang, and R. C. Giles, IEEE Photon. Technol. Lett. 16, 1594 (2004).

[11] N. Chi, L. Xu, L. Christiansen, K. Yvind, J. Zhang, P. Holm-Nielsen, C. Peucheret, C. Zhang, and P. Jeppesen, in Proceedings of OFC'2003 2, 792 (2003).

[12] Z. Long, X. Xin, R. Zhou, Z. Zhang, and D. Xu, Chin. Opt. Lett. 8, 642 (2010).

[13] R. Rui, X. Xin, Q. Zhang, K. Zhao, T. Zhao, and C. Yu, Chin. Opt. Lett. 8, 464 (2010).