Sumitomo Electric Industries, Limited

Nippon Telegraph and Telephone Public Corporation

Chihaya Tanaka

Toshiaki Kakii

Toru Yamanishi

Yuichi Toda

Masaaki Yoshida

Masao Yuto

Yuji Kameo

Kazuo Iwabuchi

A glass fiber for optical transmission comprising a glass fiber having provided thereon a first coating layer of a hardened resin and a second fluorine-containing resin layer formed by extrusion molding is disclosed. At least one of the first and second layers contains an adsorbable solid powder which is capable of adsorbing fluorine gas and/or hydrofluoric acid generated from the fluorine-containing resin during the extrusion molding. The glass fiber has an improved mechanical strength without adversely affecting transmission properties of the glass fiber.

Glass fiber for optical transmission

A method for producing an elongated optical fiber element is disclosed. The method envolves preparing two optical fiber elements by removing their outer coating layers to expose bare glass fiber portions. The glass fiber portions are melt-joint together. A material which is chemically compatible with the removed outered layer is then molded about the joined bare glass portions. A thermoplastic resin is then extruded continuously over the molded material in order to form a single elongated optical fiber element. The bonding method produces a structure which can withstand bending stress exerted on the coated optical fiber and prevent the concentration of any stress in the bonded area.

Joining method to obtain elongated coated optical fiber

Growing community of inventors

Ibaraki, Japan

Chihaya Tanaka