Glass manufacturing – Processes – Forming product or preform from molten glass
Patent
1986-02-14
1987-08-25
Lindsay, Robert L.
Glass manufacturing
Processes
Forming product or preform from molten glass
65 312, 65 421, 65 102, 65 42, C03B 37023
Patent
active
046890653
ABSTRACT:
In the interest of reducing the effect on tensile strength of flame processing of a silica-based optical fiber waveguide, such processing is by a method in which a significant flow of oxygen surrounds a flame produced by combustion of hydrogen, deuterium, ammonia, or deuterated ammonia. Flame processing may be for purposes such as, e.g., fiber drawing, fiber fusing for the sake of lateral coupling, refractive index modification by the diffusion of dopants, and fiber splicing in the manufacture of long lengths of fiber. Even though there is no use of chlorine, at least 80 percent of spliced fibers have a tensile strength greater than or equal to 500 kpsi (3.45 GPa) as is desirable in optical fiber cable manufacture.
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PCT WO85/03283 Aug. 1985 Priority U.S. Date 1/24/1984 Krause.
"Tensile Strengths <4 GPa for Lightguide Fusion Splices", Electronics Letters, J. T. Krause et al., 1981, pp. 812-813.
"Splice Loss of Single Mode Fiber as Related to Fusion Time, Temperature, and Index Profile Alteration", Istituto Internazionale Delle Comunicazioni, J. T. Krause et al., 1985, pp. 629-631.
American Telephone and Telegraph Company AT&T Bell Laboratories
Businger Peter A.
Lindsay Robert L.
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