Method of producing optical-fiber coupler
AssigneesSumitomo Electric Industries, Ltd., Sumiden Opcom, Ltd.
InventorsHiroshi Suganuma, Hiroaki Takimoto, Hiroshi Yokota, Kazuhiko Arimoto
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Abstract
The invention provides a method for producing an optical-fiber coupler with a preset branching ratio. The present invention relates to a method in which part of a plurality of optical fibers are made to closely contact with each other so as to form a coupler. The coupler is heated to thereby obtain a predetermined branching ratio; the flow rate of a gas to be supplied to a heat source is increased/decreased by a quantity proportional to a difference between the drawing speed and a preset drawing speed while predetermined tension is applied to the optical fibers.
Claims3
A method of producing an optical-fiber coupler comprising the steps of:
- contacting a plurality of optical fibers to form a coupler forming portion;
- heating the coupler forming portion with a flaming gas from a heat source;
- drawing the optical fibers at a drawing speed under constant tension;
- measuring the branching ratio of said coupler continuously during said drawing;
- measuring said drawing speed;
- and
- regulating the quantity of said flaming gas proportional to the difference between said drawing speed and a preset drawing speed, wherein said preset drawing speed is made a function of said branching ratio.
Dependencies are inferred from the claim text.