[1] [1] M. V. Kotlyar, L. O'Faolain, A. B. Krysa, and T. F. Krauss, J. Lightwave Technol. 23, 2169 (2005).

[2] [2] H. Gao, S. Yuan, L. Bo, G. Li, J. Zhang, G. Kai, and X. Dong, J. Lightwave Technol. 26, 2282 (2008).

[3] [3] D. Hays, A. Zribi, S. Chandrasekaran, S. Goravar, S. Maity, L. R. Douglas, K. Hsu, and A. Banerjee, J. Microelectromech. Syst. 19, 419 (2010).

[4] [4] W. Ren, P. Tao, Z. Tan, Y. Liu, and S. Jian, Chin. Opt. Lett. 7, 775 (2009).

[5] [5] H. Kim, J. Joo, J. Choi, B. Jun, and C. Kim, IEEE Trans. Appl. Supercond. 15, 2767 (2005).

[6] [6] S. P. Tobin, S. M. Vernon, C. Bajgar, S. J. Wojtczuk, M. R. Melloch, A. Keshavarzi, T. B. Stellwag, S. Venkatensan, M. S. Lundstrom, and K. A. Emery, IEEE Trans. Electron. Dev. 37, 469 (1990).

[7] [7] P. Li, L. Wang, S. Li, W. Xia, X. Zhang, Q. Tang, Z. Ren, and X. Xu, Chin. Opt. Lett. 7, 489 (2009).

[8] [8] H. Huang, Y. Huang, and X. Ren, Electron. Lett. 39, 113 (2003).

[9] [9] X. Duan, Y. Huang, H. Huang, X. Ren, Q. Wang, Y. Shang, X. Ye, and S. Cai, J. Lightwave Technol. 27, 4697 (2009).

[10] [10] X. Duan, Y. Huang, Q. Wang, H. Huang, X. Ren, and K. Wen, Chinese J. Lasers (in Chinese) 36, 2362 (2009).

[11] [11] X. F. Duan, Y. Huang, X. Ren, H. Huang, S. Xie, Q. Wang, and S. Cai, Opt. Express 18, 5879 (2010).

[12] [12] C. Hums, T. Finger, T. Hempel, J. Christen, and A. Dadgar, J. Appl. Phys. 101, 033113 (2007).

[13] [13] M. J. Mondry, D. I. Babit, J. E. Bowers, and L. A. Coldren, IEEE Photon. Technol. Lett. 4, 627 (1992).

[14] [14] T. Makino, J. Lightwave Technol. 12, 2092 (1994).

[15] [15] S. Jiang, L. Dong, R. Zhang, and S. Xie, Chin. Opt. Lett. 7, 960 (2009).