Glass manufacturing – Processes – Forming product or preform from molten glass
Patent
1981-01-02
1982-06-22
Fisher, Richard V.
Glass manufacturing
Processes
Forming product or preform from molten glass
65 33, 65 421, 65 32, 350 9615, 350 9634, 134 15, C03B 2320, G02B 514
Patent
active
043360475
ABSTRACT:
A method of coupling at least a pair of optical fibers together assures predictable coupling ratios and structural integrity. First, the fibers are prepared by coating or dispersing a material (e.g., a metal oxide) on or in them to control the surface tension of their exposed surfaces so that fusion occurs within predictable, extended periods of time. Next, the fibers are twisted together to assume a mutually helical relationship and to apply a small tensional stress on them and they are placed in an inert gas maintained at a predetermined pressure. A coaxially disposed tungsten coil heats them and fuses the twisted, stretched fibers together to effect a desired coupling. Stretching the twisted fibers as they are being fused together creates uniform tapered sections which are needed to induce proper coupling. The rate of heating and fusing, the inert gas and its pressure, and the force exerted during stretching are all factors determinative of the degree of coupling. These factors are more precisely regulatable due to the addition of the material such as metal oxide that controls the surface tension of the of the fibers to be coupled.
REFERENCES:
patent: 4173393 (1979-11-01), Maurer
patent: 4291940 (1981-09-01), Kawasaki et al.
Ozeki et al.; "Tapered Section of Multimode Cladded Fibers . . . ", Applied hysics Letters; vol. 26, No. 7; Apr. 1, 1975; pp. 386-388.
Kawasaki et al.; "Low Loss Access Couplers . . . ", Applied Optics; vol. 16, No. 7; Jul. 1977; pp. 1794-1795.
Pinnow et al.; "Hermetically Sealed High Strength Fiber . . . ", Transactions IEEE of Japan; vol. E61, No. 3; Mar. 1978; pp. 171-173.
Rawson et al.; "Star Couplers Using Fused . . . Fibers", Electronic Letters; vol. 14, No. 9; Apr. 27, 1978; pp. 274-275.
Altman Daniel E.
Pavlopoulos Theodore G.
Beers Robert F.
Fisher Richard V.
Johnston Ervin F.
Keough Thomas Glenn
The United States of America as represented by the Secretary of
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