[1] D. J. Blumenthal, B.-E. Olsson, G. Rossi, T. E. Dimmick, L. Rau, M. Ma sanovic, O. Lavrova, R. Doshi, O. Jerphagnon, J. E. Bowers, V. Kaman, L. A. Coldren, and J. Barton, J. Lightwave Technol. 18, 2058 (2000).
[2] X. Xin, P. S. de Brito Andre, A. L. J. Teixeira, P. P. Monteiro, and J. R. F. Da Rocha, ETRI Journal 27, 267 (2005).
[3] 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).
[4] A. K. Garg and R. S. Kaler, Chin. Opt. Lett. 6, 807 (2008).
[5] K. Qiu and Y. Ling, Chin. Opt. Lett. 6, 96 (2008).
[6] G.-K. Chang and J. Yu, Electron. Lett. 40, 442 (2004).
[7] G.-K. Chang, J. Yu, A. Chowdhury, and Y.-K. Yeo, J. Lightwave Technol. 23, 3372 (2005).
[8] J. Yu and G.-K. Chang, IEEE Photon. Technol. Lett. 16, 320 (2004).
[9] J. Yu, L. Xu, P. N. Ji, Z. Jia, Q. Yang, T. Wang, and G.-K. Chang, IEEE Photon. Technol. Lett. 19, 1310 (2007).
[10] F. Yan, X. Mao, L. Wang, Y. Fu, H. Wei, K. Zheng, T. Gong, P. Liu, P. Tao, and S. Jian, Acta Phys. Sin. (in Chinese) 58, 6296 (2009).
[11] L. Moler, C. Xie, X. Wei, X. Liu, C. Stook, J. Wood, P. Bravetti, P. Bergamini, and C. Gualandi, IEEE Photon. Technol. Lett. 16, 1152 (2004).
[12] K. Yonenaga and S. Kuwano, J. Lightwave Technol. 15, 1530 (1997).
[13] A. Tan and E. Pincemin, J. Lightwave Technol. 27, 396 (2009).
[14] W. Kaiser, T. Wuth, M. Wichers, and W. Rosenkranz, IEEE Photon. Technol. Lett. 13, 884 (2001).
