About UESUGI N
About NTT, JPN
About KAWATA O
About NTT, JPN
About NEGISHI Y
About NTT, JPN
About Review of the Electrical Communications Laboratories
About optical fiber cable
About Optical communication systems and equipment
About 客
About 伝送回線
About 分散シフト光ファイバ
About ケーブル