1. Department
of Chemical Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan
2. Optical Communications R&D Laboratories, Sumitomo Electric Industries Ltd, Japan 1, Taya-cho, Sakae-ku, Yokohama 244-8588, Japan
3. National Metrology
Institute of Japan, National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba 305-8565, Japan