[1] B.-E. Olsson, P. Ohlen, L. Rau, and D. J. Blumenthal, IEEE Photon. Technol. Lett. 12, 846 (2000).
[2] O. Aso, S. Arai, T. Yagi, M. Tadakuma, Y. Suzuki, and S. Namiki, Electron. Lett. 36, 709 (2000).
[3] K. Inoue and H. Toba, IEEE Photon. Technol. Lett. 4, 69 (1992).
[4] T. A. Birks, J. C. Knight, and P. St. J. Russell, Opt. Lett. 22, 961 (1997).
[5] R. Hainberger and S. Watanabe, IEEE Photon. Technol. Lett. 17, 70 (2005).
[6] L. P. Shen, W.-P. Huang, G. X. Chen, and S. S. Jian, IEEE Photon. Technol. Lett. 15, 540 (2003).
[7] K. O. Hill, D. C. Johnson, B. S. Kawasaki, and R. I. MacDonald, J. Appl. Phys. 49, 5098 (1978).
[8] N. Shibata, R. P. Braun, and R. G. Waarts, IEEE J. Quantum Electron. 23, 1205 (1987).
[9] B. Batagelj, in Proceedings of 2nd International Conference on Transparent Optical Networks 179 (2000).
[10] K. Kihuclii and C. Lorattanasane, IEEE Photon. Technol. Lett. 6, 992 (1994).
