Importance

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Abstract

In an optical fiber drawing device of the present invention, as an operational parameters corresponding to the real drawing speed in the duration from the moment of starting the operation of the optical fiber drawing device till the moment of reaching the target drawing speed are extracted from operational parameters stored in a operational parameter storage unit and applied to the optical fiber drawing device. The operational parameters include a base preform feeding speed, a target variation of real drawing speed, a gain multiplied by the speed element related with the variation of the real drawing speed, an operation cycle, a drawing furnace temperature, a coating resin pressure to coat the optical fiber, and flow of cooling gaseous helium, etc. The optical fiber drawing device of the present invention capable of a stable drawing control that does not generate hunting or overshoot or the like, while reducing the start-up fiber length (or speed increasing time) in the unsteady state (transient state) operation of the optical fiber drawing device.

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First Claim