OPTICAL FIBER, PRODUCING METHOD OF OPTICAL FIBER, PRODUCING APPARATUS OF OPTICAL FIBER AND OPTICAL CONNECTOR

摘要

PROBLEM TO BE SOLVED: To provide an optical fiber in which the non-circularity of clad is suppressed, to provide a producing method of the optical fiber, to provide a producing apparatus suitable for the production of the optical fiber and to provide an optical connector provided with the optical fiber.

SOLUTION: The optical fiber contains at least two kinds of glass parts having different melting points and is constituted so that a difference between the maximum diameter and the minimum diameter of the clad of the optical fiber having cross-section shapes non-concentrically arranged becomes the maximum of 0.5% or less. In the producing method of the optical fiber, the non-circularity of clad of drawn optical fiber or the difference between the maximum outer diameter and the minimum outer diameter of clad is measured online, the measurement result is fed back to the pressure of pressing an auxiliary member and the non-circularity of clad is controlled.

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