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The characteristics of optical fibers during 60 Co gamma irradiation, i.e. the effect of dopant, OH content, dose rate and temperature were investigated. Moreover, the model which presumes the effect of long term use from the result of short term irradiation was investigated. The range of environment and a type of fiber which could be used for a long time was decided. From experimental results, it became clear that the fiber which could be used in radiation exposed area was only pure silica core fiber. Moreover, the increase of transmission loss of pure silica core fiber was able to be explained from the model of color center formation by irradiation and from the dose rate dependence. The increase of transmission loss of pure silica core fiber used for a long time was presumed quantitatively., This article is from Proceedings of the International Wire and Cable Symposium (31st) Held at Cherry Hill, New Jersey, on November 16, 17 and 18, l982, ADA125662. Prepared in cooperation with Toshiba Research and Development Center, Toshiba Corp.

This paper describes the properties of a new material for optical fiber jacket and those of jacketed optical fibers. The new material, which is thermoplastic resin filled with potassium titanate whiskers, can be easily extruded by ordinary extruder and colored by ordinary method as well. The jacket consisting of this material has a small linear expansion coefficient, thus the optical fibers jacketed with this material are quite superior to temperature characteristics where the fibers show no significant loss increase even at temperature characteristics where the fibers show no significant loss increase evenat temperatures as low as -60 C. The lateral force characteristics of the fibers are also improved because of enhanced Young's modulus of the jacket. Furthermore, the optical fibers jacketed with this material preserves sufficient flexibility and handling performances on the same level as conventional nylon jacketed fibers. (Author)