[1] A. Mori, Y. Ohishi, and S. Sudo, Electron. Lett. 23, 863 (1997).
[2] H. Ono, A. Mori, K. Shikano, and M. Shimizu, IEEE Photon. Technol. Lett. 14, 1070 (2002).
[3] H. Ono, A. Mori, K. Shikano, and M. Shimizu, IEEE Photon. Technol. Lett. 14, 1073 (2002).
[4] N. Mira, S. Shaoxiong, and J. Animsh, Appl. Opt. 39, 4979 (2000).
[5] S. Shen, M. Naftaly, and A. Jha, OFC TuQ6-1 (2001).
[6] S. Man, H. Liu, Y. Wong, E. Pun, and P. Chung, LEOS. 1, 196 (1998).
[7] S. Aozaso, T. Sakamoto, T. Kanamori, Hoshino, K. Kobayashi, and M. Shimizu, IEEE Photon. Technol. Lett. 12, 1331 (2001).
[8] H. Jeong, K. Oh, S. R. Han, and T. Morse, Chem. Phys. Lett. 367, 507 (2003).
[9] W. Huang, H. Tam, P. Wai, X. Dong, M. Hai, and J. Xie, Chin. Phys. Lett. 19, 1307 (2002).
[10] P. Espindola, G. Ales, J. Park, and T. Strasser, Electron. Lett. 34, 1263 (2000).
[11] S. Marjanovic, J. Toulouse, H. Jain, C. Sandmann, V. Dierolf, A. Kortan, N. Kopylov, and R. Ahrens, J. Non-Cryst. Solids. 322, 311 (2003).
[12] T. Kanamori, Y. Terunuma, Y. Nishida, K. Hoshino, K. Nakagawa, Y. Ohishi, and S, Sudo, J. Non-Cryst. Solids. 213&214, 121 (1997).
