2. Oh MC, Lee HJ, Lee MH, Ahn JH, Han SG, Kim HG, Appl. Phys. Lett., 73(18), 2543 (1998)
3. Ahn JH, Lee HJ, Hwang WY, Oh MC, Lee MH, Han SG, Kim HG, Yim JHIEICE Transactions on Communications and Transactions on Electronics, E82-B(2), 406 (1999)
4. Tacato N, Jinguji K, Yasu M, Toba H, Kawachi M, IEEE J. Lightwave Technol., 6(6), 1003 (1988)
5. Li YP, Henry CH, IEE Proc.-Optoelectron, 143(5), 263 (1996)
6. Yoshimura R, Hikita M, Tomaru S, Imamura S, IEEE J. Lightwave Technol., 16(6), 1030 (1998)
7. Watanabe T, Ooba N, Hayashida S, Kurihara T, Imamura S, IEEE J. Lightwave Technol., 16(6), 1049 (1998)
8. Kubayashi J, Matsuura T, Hida Y, Sasaki S, Maruno T, IEEE J. Lightwave Technol., 16(6), 1024 (1998)
9. Oh MC, Lee HJ, Lee MH, Ahn JH, Han SG, IEEE Photon. Technol. Lett., 10(6), 813 (1998)