Treatment of covered optical fiber

Abstract

Abstract PURPOSE:To obtain covered optical fiber having reliability for a long period, by subjecting covered optical fiber coated with a thermosetting resin to contact reaction with water, heat-treating it. CONSTITUTION:The outer periphery of the optical fiber 2 consisting of core and clad is covered with a thermosetting or photosetting resin (e.g., two-pack cold- vulcanizable silicone rubber) to form the covered layer 3, it is subjected to contact reaction with water at 100-150 deg.C for 2-200hr, so that >=0.1wt% water is absorbed in the covered layer 3. The optical fiber 2 is introduced to the outer cylinder 11 of the furnace 10, heated in an inert gas atmosphere sent throught the gas inlet pipe 15 by the heater 19, it is fed to the inner cylinder 12, sucked through the suction pipe 18, volatile components evolved in the covered layer 3 are removed, and the covered layer 4 consisting of a thermoplastic resin is then formed on the outer periphery of the covered layer 3.

Inventors

• 👤 Masao Nishimura
• 👤 西村　真雄
• 👤 Naoyuki Wada
• 👤 和田　直行
• 👤 Kazuaki Yoshida
• 👤 和昭 吉田
• 👤 Katsumi Orimo
• 👤 折茂　勝巳
• 👤 Takao Kimura
• 👤 隆男 木村
• 👤 Motohiro Nakahara
• 👤 基博 中原
• 👤 Nobuo Inagaki
• 👤 稲垣　伸夫

Bibliographic Details