Totoku Electric Co., Ltd

Hidehiko Shimizu

Masanori Nonomura

Yasushi Murakami

Satoshi Takehana

Tomio Kaise

Tatuo Yamaguchi

Asuka Nakayama

An optical fiber made of quartz or glass and having a core and a cladding includes a microporous silica solution applied to an outer peripheral surface thereof, which is synthesized from a mixture of silicon alcoxide, active alcohol for facilitating hydrolytic action, alcohol, and water, by means of the sol-gel process, followed by baking to form a thin film of microporous silica made chiefly of silicon. Microporous of the thin film of microporous silica have function of cushioning to cushion and restrain that micro cracks much existing in the cladding undergo growth when the optical fiber is bent so that the optical fiber is likely to be broken. And the thin film of microporous silica which made chiefly of silicon has high heat-resistant properties similarly to the optical fiber itself. Accordingly, a heat-resistant optical fiber very excellent in heat-resistant properties is provided.

Heat-resistant optical fiber, a method of manufacturing the same, a method of fixing an optical fiber, and a heat-resistant optical fiber using a protective tube

To avoid change in the property of an optical fiber, an optical fiber cord 100 has a structure fabricated by exposing a portion of the optical fiber 1 located at one end of an optical fiber core 15 which comprises a cushion layer 2 provided over the outer side of the optical fiber 1 and a cladding 3 provided over the outer side of the cushion layer 2; protecting one end of the exposed portion of the optical fiber 1 adjacent to the end of the cushion layer 3 with a roll of low hardness resin 4; and bonding the exposed portion of the optical fiber 1 to the capillary 32 of a ferrule 30 by an adhesive 20 so that the one end of the optical fiber core 15 is fixed integral with the ferrule 30. The stress of thermal shrinkage of the adhesive 20 is attenuated by the action of the low hardness resin 4 thus hardly acting on the optical fiber 1. Accordingly, a change in the property of the optical fiber 1 such as mode shift can be avoided.

Method of adhesive bonding optical fibers and optical fiber cord

Growing community of inventors

Ueda, Japan

Hidehiko Shimizu