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Apparatus-and-process-for-automatic-control-of-the-production-of-optical-fiber

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Apparatus and process for automatic control of the production of optical fiber

Details

Inventors: Dabby, Franklin W.; Chesler, Ronald B.;
Assignee: Times Fiber Communications, Inc. (Wallingford, CT)
Primary Examiner: Fisher; Richard V.
Assistant Examiner:
Attorney, Agent or Firm: Bacon & Thomas

Apparatus and process for automatic control of the production of optical fiber are disclosed. The process comprises continuously depositing and sintering borosilicate glass particles on a fused silica rod or a graded index rod in such a manner that the glass exhibits a uniform, radially increasing concentration of boron. The appropriate boron oxide/silica concentration ratio in the glass particles is controlled by the time of deposit and the weight and diameter of the rod, which are continuously monitored. The concentration of boron oxide and silica in the particulate is likewise continuously monitored to insure that the correct portion of boron oxide/silica is deposited. The apparatus for conducting the process, includes means for continuously monitoring the weight and diameter of the rod and the boron oxide content of the glass particles and means for automatically regulating the equipment used to produce the optical fiber in response to readings from the monitoring means.

DETAILED DESCRIPTION Accordingly, it is an object of the present invention to provide a method for preparing a preform which can be drawn into optical fiber, which allows for the precise control of the composition of the borosilicate deposited on the glass start rod.
Another object of the invention is to provide a method for automatically varying the composition of the borosilicate particulate as it is being deposited on the start rod so as to obtain a preform having a uniform, graded index of refraction profile.
Still other objects and advantages of the present invention will become apparent to those of skill in the art upon review of the entire disclosure.
The foregoing objects and advantages are accomplished by providing a process for the production of optical fiber which comprises preparing a preform by depositing and sintering borosilicate particles on a cylindrical glass rod, heating the preform so prepared to the drawing temperature and drawing it into optical fiber in which the composition of the borosilicate particulate deposited on the rod is continuously adjusted in response to measurements of the time of deposit of the particulate and the weight and diameter of the rod.
The composition of the borosilicate particulate may also be monitored to determine its boron oxide content as it is deposited on the rod via infra-red spectrophotometry.

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