Patent EP0223466A2 successfully refreshed from Google Patents.
EP0223466A2
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EP
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Improved optical fiber
Assignee: Dow Silicones Corp
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Filing: 1986-10-31
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Granted: —
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Expires: 2006-10-31
Abstract
Abstract An optical communications fiber is made from a core of high refractive index glass, a cladding of lower refractive index glass, and an edge cladding of a high refractive index glass. This optical fiber does not depend upon the refractive index of the polymeric coating to function properly, because the edge cladding refracts the errant light away from the core and cladding.
Inventors
- 👤 William Erwin Dennis
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 10:06
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/02; G02B6/036; G02B6/03616; G02B6/03622; G02B6/03627; G02B6/02395
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
59 words
An optical fiber comprising a core of an optical glass, a cladding layer of optical glass in which the index of refraction of the core is higher than the index of refraction of the cladding, and an edge cladding consisting essentially of a doped glass having an index of refraction higher than the index of refraction of the cladding.
Claim 2
Dependent Claim
59 words
An optical fiber comprising a core of an optical glass, a cladding layer of optical glass in which the index of refraction of the core is higher than the index of refraction of the cladding, and an edge cladding consisting essentially of a doped glass having an index of refraction higher than the index of refraction of the cladding.
Claim 3
Dependent Claim
61 words
An optical fiber consisting essentially of a core of an optical glass, a cladding layer of optical glass in which the index of refraction of the core is higher than the index of refraction of the cladding, and an edge cladding consisting essentially of a doped glass having an index of refraction higher than the index of refraction of the cladding.
Claim 4
Dependent Claim
61 words
An optical fiber consisting essentially of a core of an optical glass, a cladding layer of optical glass in which the index of refraction of the core is higher than the index of refraction of the cladding, and an edge cladding consisting essentially of a doped glass having an index of refraction higher than the index of refraction of the cladding.
Claim 5
Dependent Claim
17 words
An optical fiber according to claim 1 further comprising a primary polymeric coating over the edge cladding.
Claim 6
Dependent Claim
22 words
The optical fiber according to claim 3 in which the primary polymeric coating over the edge cladding is a silicone elastomeric coating.
Claim 7
Dependent Claim
20 words
An optical fiber according to claim 3 further comprising a secondary polymeric coating which is over the primary polymeric coating.
Claim 8
Independent Claim
157 words
A method of fabricating an optical fiber to reduce the dependence of the fiber's ability to function on the primary polymeric coating comprising making a preform comprising a core of high refractive index optical glass surrounded by an optical glass having an index of refraction lower than the core glass and suitable for cladding, doping the outer surface of the preform to such a depth that a fiber drawn from the preform will have a doped glass thickness sufficient to refract away from the cladding and core those wavelengths escaping from the core transmission and passing through the cladding, said doping being done with a dopant which will provide an index of refraction greater than the index of refraction of the cladding, the doped glass thickness being an edge cladding, and drawing an optical fiber from the preform to make an optical fiber of a reduced diameter which has a core, a cladding, and an edge cladding.
Claim 9
Independent Claim
157 words
A method of fabricating an optical fiber to reduce the dependence of the fiber's ability to function on the primary polymeric coating comprising making a preform comprising a core of high refractive index optical glass surrounded by an optical glass having an index of refraction lower than the core glass and suitable for cladding, doping the outer surface of the preform to such a depth that a fiber drawn from the preform will have a doped glass thickness sufficient to refract away from the cladding and core those wavelengths escaping from the core transmission and passing through the cladding, said doping being done with a dopant which will provide an index of refraction greater than the index of refraction of the cladding, the doped glass thickness being an edge cladding, and drawing an optical fiber from the preform to make an optical fiber of a reduced diameter which has a core, a cladding, and an edge cladding.
Claim 10
Independent Claim
158 words
A method of fabricating an optical fiber to reduce the dependence of the fiber's ability to function on the primary polymeric coating consisting essentially of making a preform comprising a core of high refractive index optical glass surrounded by a optical glass having an index of refraction lower than the core glass and suitable for cladding, doping the outer surface of the preform to such a depth that a fiber drawn from the preform will have a doped glass thickness sufficient to refract away from the cladding and core those wavelengths escaping from the core transmission and passing through the cladding, said doping being done with a dopant which will provide an index of refraction greater than the index of refraction of the cladding, the doped glass thickness being an edge cladding, and drawing an optical fiber from the preform to make an optical fiber of reduced diameter which has a core, a cladding, and an edge cladding.
Claim 11
Independent Claim
158 words
A method of fabricating an optical fiber to reduce the dependence of the fiber's ability to function on the primary polymeric coating consisting essentially of making a preform comprising a core of high refractive index optical glass surrounded by a optical glass having an index of refraction lower than the core glass and suitable for cladding, doping the outer surface of the preform to such a depth that a fiber drawn from the preform will have a doped glass thickness sufficient to refract away from the cladding and core those wavelengths escaping from the core transmission and passing through the cladding, said doping being done with a dopant which will provide an index of refraction greater than the index of refraction of the cladding, the doped glass thickness being an edge cladding, and drawing an optical fiber from the preform to make an optical fiber of reduced diameter which has a core, a cladding, and an edge cladding.
Claim 12
Independent Claim
157 words
A method of fabricating an optical fiber to reduce the dependence of the fiber's ability to function on the primary polymeric coating consisting of making a preform comprising a core of high refractive index optical glass surrounded by an optical glass having an index of refraction lower than the core glass and suitable for cladding, doping the outer surface of the preform to such a depth that a fiber drawn from the preform will have a doped glass thickness sufficient to refract away from the cladding and core those wavelengths escaping from the core transmission and passing through the cladding, said doping being done with a dopant which will provide an index of refraction greater than the index of refraction of the cladding, the doped glass thickness being an edge cladding, and drawing an optical fiber from the preform to make an optical fiber of reduced diameter which has a core, a cladding, and an edge cladding.
Claim 13
Independent Claim
157 words
A method of fabricating an optical fiber to reduce the dependence of the fiber's ability to function on the primary polymeric coating consisting of making a preform comprising a core of high refractive index optical glass surrounded by an optical glass having an index of refraction lower than the core glass and suitable for cladding, doping the outer surface of the preform to such a depth that a fiber drawn from the preform will have a doped glass thickness sufficient to refract away from the cladding and core those wavelengths escaping from the core transmission and passing through the cladding, said doping being done with a dopant which will provide an index of refraction greater than the index of refraction of the cladding, the doped glass thickness being an edge cladding, and drawing an optical fiber from the preform to make an optical fiber of reduced diameter which has a core, a cladding, and an edge cladding.
Claim 14
Dependent Claim
101 words
A preform for the manufacture of optical fiber comprising a core optical glass, surrounded by a cladding glass which has an index of refraction lower than the core optical glass, and doped glass on the outer surface of the cladding which will be sufficient to provide a thickness sufficient to refract away from the cladding and core those wavelengths escaping from the core transmission and passing through the cladding when an optical fiber is drawn from the preform and where a dopant is used to make the outer surface have an index of refraction which is higher than the cladding glass.
Claim 15
Dependent Claim
101 words
A preform for the manufacture of optical fiber comprising a core optical glass, surrounded by a cladding glass which has an index of refraction lower than the core optical glass, and doped glass on the outer surface of the cladding which will be sufficient to provide a thickness sufficient to refract away from the cladding and core those wavelengths escaping from the core transmission and passing through the cladding when an optical fiber is drawn from the preform and where a dopant is used to make the outer surface have an index of refraction which is higher than the cladding glass.
References Cited (Backward Citations)
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