Patent ID: 7845195
Filing Date: 2010-12-07
Classification: C03B

Abstract:
1. A method of manufacturing an optical fiber, the method comprising: forming a bare optical fiber by melting and then drawing an optical fiber preform; coating the bare optical fiber to form an optical fiber; and twisting the optical fiber by placing an optical fiber twisting apparatus against a portion of an outer circumference of the optical fiber, so that a twist is imparted to a molten portion of the optical fiber preform, wherein the optical fiber twisting apparatus comprises: a trestle comprising a reference surface; a support portion extending from the reference surface of the trestle; and a twist roller which is supported by the support portion, wherein the twist roller comprises an outer circumference comprising a first edge spaced apart from a second edge, and wherein an accuracy (e-f)/2 of the outer circumference of the twist roller when the twist roller is supported by the support portion is 15 μm or less, where e is a maximum value of an oscillation of a measuring needle of a micro gauge when the twist roller is rotated and measured using the micro gauge, while f is a minimum value of the oscillation of the measuring needle of the micro gauge when the twist roller is rotated and measured using the micro gauge.