Ultraviolet resistant silica glass fiber
AssigneesShin-Etsu Chemical Co., Ltd., Mitsubishi Cable Industries, Ltd.
InventorsMasatoshi Takita, Hiroyuki Hayami, Koichi Suzuki
Life of this patent
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Abstract
A silica glass optical fiber superior in resistance to ultraviolet rays, which fiber comprises a doped silica glass cladding layer formed on a silica glass core, said silica glass core having an OH content of 10-1000 ppm, a fluorine content of 50-5000 ppm, and being substantially free of chlorine.
Claims13
A silica glass optical fiber for use at the ultraviolet region, which is composed of a doped silica glass cladding layer formed on a silica glass core, said silica glass core having (1) an OH group content of 10-1000 ppm and (2) a fluorine content of 50-5000 ppm, and (3) being substantially free of chlorine,
- wherein the silica glass for forming said core is synthetic silica glass produced by burning at least one member selected from a group consisting of silicon compounds of the formula R.sup.1 mSi(OR.sup.2).sub.4-m, and at least one member selected from the a group consisting of fluorine compounds of the formula C.sub.a H.sub.b F.sub.c, wherein R.sup.1 and R.sup.2 are each a lower alkyl group having 1 to 4 carbon atoms, and 0.ltoreq.m.ltoreq.4, 1.ltoreq.a.ltoreq.3, 0.ltoreq.b.ltoreq.7, and 1.ltoreq.c.ltoreq.8, with oxyhydrogen flame, and vitrifying synthesized silica fine particles.
A method of transmitting energy or signals using ultraviolet rays, which comprises transmission of ultraviolet energy or signals through a silica glass optical fiber resistant to degradation by ultraviolet rays composed of a doped silica glass cladding layer formed on a silica glass core or a bundle fiber consisting of a number of said fibers, said silica glass core having (1) an OH group content of 10-1000 ppm and (2) a fluorine content of 50-5000 ppm, and (3) being substantially free of chlorine.
An ultraviolet ray transmitting system comprising a light source to emit ultraviolet rays, and an optical fiber to transmit the ultraviolet rays emitted by said light source, wherein said optical fiber is composed of a doped silica glass cladding layer formed on a silica glass core, said silica glass core has an OH group content of 10-1000 ppm and a fluorine content of 50-5000 ppm, and being substantially free of chlorine, and has resistance to deterioration caused by the ultraviolet rays being transmitted.
A method of transmitting ultraviolet rays using an ultraviolet ray transmitting system comprising a light source emitting ultraviolet rays, and an optical fiber receiving and transmitting said ultraviolet rays emitted by said light source, wherein said optical fiber is composed of a doped silica glass cladding layer formed on a silica glass core, said silica glass core has an OH group content of 10-1000 ppm and a fluorine content of 50-5000 ppm, is substantially free of chlorine, and has resistance to deterioration caused by said ultraviolet rays.
Dependencies are inferred from the claim text.