[1] J. Hong, H. Kim, and T. Makino, IEEE J. Lightwave Technol. 16, 1323 (1998).
[2] B. Mason, G. A. Fish, S. P. DenBaars, and L. A. Coldren, IEEE Photon. Technol. Lett. 11, 638 (1999).
[3] D. Vakhshoori, P. Tayebati, C. C. Lu, M. Azimi, P. Wang, J. H. Zhou, and E. Canoglu, Electron. Lett. 35, 900 (1999).
[4] T. Day, F. Luecke, and M. Brownell, Lasers & Optronics 1, 15 (1993).
[5] A. Sakamoto, T. Matano, and H. Takeuchi, IEICE Trans. Electron. E83-C,1441 (2000).