1. Department of Chemical Engineering; Hiroshima University; 1-4-1 Kagamiyama Hiroshima Higashi-Hiroshima 739-8527 Japan
2. Department of Chemical System Engineering; The University of Tokyo; 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan
3. Optical Communications R&D Laboratories; Sumitomo Electric Industries Ltd.; 1, Taya-cho Sakae-ku Yokohama 244-8588 Japan