Method of manufacturing an optical fiber
AssigneeSumitomo Electric Industries, Ltd.
InventorsYuji Abe, Ryutaro Miyazaki
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Abstract
A manufacturing method that enables stably making a high-quality optical fiber is provided. The manufacturing method of the present invention comprises: a softened portion falling step in which an optical fiber preform is heated in a heating furnace and a dropping part of softened portion of the preform thus heat-softened is allowed to drop; and a drawing step for drawing the preform such that the softened glass is drawn into a fiber by applying a tension with a take-up means after the softened portion falling step, whereas the preform is rotated about its axis at the softened portion falling step.
Claims6
An optical fiber manufacturing method comprising:
- a softened portion falling step, wherein an optical fiber preform is heated in a heating furnace and a part of a softened portion of the preform thus heat-softened is allowed to drop while the preform is rotating about its axis at a first rotational speed;
- and
- a drawing step, wherein the preform is drawn into a fiber as a remaining part of the softened portion is extended by applying a tension while the preform is rotating about its axis at a second rotational speed lower than the first rotational speed.
An optical fiber manufacturing method comprising a drawing step, wherein
- an optical fiber preform is softened by heating in a heating furnace and the softened portion is extended downward to draw the preform by applying a tension with a take-up portion, and wherein the preform is rotated about its axis during the drawing of an upper-end vicinity of the preform, wherein
- the preform is rotated about its axis during the drawing of a central portion of the preform, and the rotational speed of the preform during the drawing of the upper-end vicinity of the preform is higher than the preform rotational speed adopted during the drawing of the central portion of the preform.
Dependencies are inferred from the claim text.