Manufacture of optical fibers

Details Manufacture of optical fibers Manufacture of optical fibers

C - Chemistry, Metallurgy

03

B

49/8

C03B 37/027 (2006.01) C03B 37/018 (2006.01) G02B 6/00 (2006.01)

Patent

CA 1188102

-12- IMPROVED MANUFACTURE OF OPTICAL FIBERS Abstract This invention relates to an improved method of making optical fibers utilizing a technique for minimizing taper, including entrance taper, in an optical fiber preform made by the deposition of reacted glass precursor material on the inside of a tube. In one embodiment, a torch (or other heat source) deposition function is determined, which relates the amount of deposited material as a function of distance from the torch or other heat source. A velocity profile for the moving heat zone can then be determined that minimizes taper. For example, in a single mode optical fiber preform made by the modified chemical vapor deposition technique, a reduction in entrance taper in a 90 cm long preform of from about 30 cm using a linear velocity profile to about 10 cm with a profile determined according to the inventive technique is achieved.

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