Author Affiliations

K. Shibahara,⁽¹⁾ T. Mizuno,⁽¹⁾ H. Takara,⁽¹⁾ H. Kawakami,⁽¹⁾ D. Lee,⁽¹⁾ Y. Miyamoto,⁽¹⁾ S. Matsuo,⁽²⁾ K. Saitoh,⁽³⁾ and M. Yamada⁽⁴⁾

⁽¹⁾NTT Network Innovation Laboratories, NTT Corporation, 1-1 Hikari-no-oka, Yokosuka, Kanagawa, 239-0847 Japan

⁽²⁾Optics and Electronics Laboratory, Fujikura Ltd., 1440, Mutsuzaki, Sakura, Chiba, 285-8550 Japan

⁽³⁾Hokkaido University, North 14 West 9, Sapporo, Hokkaido, 060-0814 Japan

⁽⁴⁾Osaka Prefecture University, 1-1 Gakuen-cho, Sakai, Osaka 599-8531, Japan