Glass manufacturing – Processes – Forming product or preform from molten glass
Patent
1981-11-02
1982-12-07
Fisher, Richard V.
Glass manufacturing
Processes
Forming product or preform from molten glass
65 315, 65 31, C03B 37075, C03C 2502
Patent
active
043625428
ABSTRACT:
In a method of making a strong fiber waveguide in which a preform is heated and pulled to make the fiber, the improvement includes adding to the preform at least one dopant capable of creating a mechanical stress profile in the preform and at least another dopant capable of creating an index of refraction profile in the preform, and varying the dopants added to produce a composition profile so that the composition profile varies radially from the center to the surface to form a core, an intermediate clad layer having an index of refraction lower than the core, and a surface layer which is in compression having a thermal expansion coefficient smaller than the core and having a predetermined thickness less than 10% of the radius of the core, the compression being greater than 20,000 psig.
REFERENCES:
Drexhage et al., "Residual Stresses in Cesium Oxide Profiled Silica Glasses", J. Am. Cer. Soc., 1979, vol. 62, No. 7-8, pp. 427 and 428.
Gupta Prabhat K.
Macedo Pedro B.
Mohr Robert K .
Fisher Richard V.
Litovitz Theodore A.
Macedo Pedro B.
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