Optical fiber preform and its fabrication process

Details Optical fiber preform and its fabrication process Optical fiber preform and its fabrication process

1997-07-30

1999-11-30

Bell, Janyce

Coating processes

Optical element produced

Polarizer, windshield, optical fiber, projection screen, or...

65420, 385123, 385127, 427402, 427237, 42725518, 42725537, B05D 506, G02B 602

Patent

active

059938994

ABSTRACT:
A process of fabricating an optical fiber preform, preferably a multimode optical fiber preform, having a maximum refractive index along an axis of the fiber and a lower refractive index at its periphery. The process includes the following steps: depositing successive layers onto the interior of the tube with the refractive index increasing from the first, larger diameter layer to the central layer, each layer being formed from gases which react with each other inside the tube, and varying the proportions of the gases from one layer to another to vary the index. The gases are introduced into the tube at a velocity such that the radial index profile is homogenized in the longitudinal direction. This velocity is advantageously maintained substantially the same for the fabrication of all the layers. This process produces preforms having a homogeneous index profile in the longitudinal direction.

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patent: 4257797 (1981-03-01), Andrejco
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patent: 4579571 (1986-04-01), Hicks, Jr.
patent: 4932990 (1990-06-01), Michie et al.
Patent Abstracts of Japan, vol. 5, No. 194 (C-82), Dec. 10, 1981 corresponding to JP 56 114842 A (Fujitsu Co., Ltd.) dated Sep. 9, 1981.
A. Hordvik et al. "A Method for Reducing the Conicalness of the Core Diameter in Preforms Made by the MCVD Process", ECOC VII: Conference Proceedings, Sep. 8-11, 1981, Copenhague, DK, pp. 1.3-1-1.3-4.
Patent Abstracts of Japan, vol. 6, No. 143 (C-117) Aug. 3, 1982 correspondig to JP 57 067041 A (NT&T Corp.) Apr. 23, 1982.

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