Doped glass and process for making

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65 312, 65 32, 65 182, C03B 37025

Patent

active

045575614

ABSTRACT:
Technique for making glass having a predetermined refractive index profile using fluorine doping and fluorine etching. A substrate glass body is coated with a plurality of successively applied vapor deposited glass layers wherein each succeeding layer is built with a larger quantity of fluorine than the adjacent preceding layer. The amount of the doping in each layer is such as to achieve the desired refractive index profile. Fluorine etching is employed to provide a uniform core before the glass body is heat fused into a rod-like structure suitable for the preparation of light waveguides for use in optical communications technology.

REFERENCES:
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patent: 4082420 (1978-04-01), Shiraishi et al.
patent: 4165915 (1979-08-01), Rau et al.
patent: 4221825 (1980-09-01), Guerder et al.
patent: 4263030 (1981-04-01), Kobayashi et al.
Schneider et al., article entitled "A New Method to Reduce the Central Dip and the OH.sup.- Content in MCVD Preforms", Proc. Europ. Conference Optical Communication Cannes Sep. 1982, pp. 36-40.
Liegois article entitled "MCVD Single Mode Optical Fibers: The Core Concentration Profile" proceedings of 9th Int. Conf. on CVD, Sep. 1981, Gouvieux (France).
Liegois et al., article entitled "MCVD Preform Central Dip Reduction by Collapse under Fluorinated Atmosphere" appearing in Journal of Non-Crystalline Solids 47.2 (1982) 247-250, North Holland Publ. Co.
Manuse and Presby article entitled "Effects of Profile Deformations on Fiber Band Width", Applied Optics 18 (1975) pp. 3758-3783.
French, Tasker, and Simpson article entitled "Grated Index Fiber Waveguides with Borosilicate Composition: Fabrication Techniques", Applied Optics 15 (1976) pp. 1803-1807.

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