The quartz glass tube as a semimanufacture for forming the optical fiber which is difficult to bend and the optical fiber which is difficult to bend, method for forming the fiber

摘要

The optical fiber where known is difficult to bend, the core zone which possesses refractive index n _K, having possessed refractive index n _M, consists of the cladding zone which covers the core zone, and the quartz glass which dopes with fluorine and has possessed refractive index n _{F and} has the ring zone which surrounds the cladding zone, the formula of n _{Fn Mn K} has consisted. In order to solve the topic that it offers the optical fiber which is superior in possessing and connected characteristic and compatibility, according to the method of relating to this invention, the ring zone (21) the quartz glass is formed high flexural strength by depojishiyonpurosesu outside plasma type, the substrate body (20) on, consists of the quartz glass which dopes with fluorine with this, and at least the thickness of 1mm, the ring zone layer which possesses the refractive index of n _{F 1.4519 the} D line of the possessing and the sodium lamp as a base is formed.