US4690500A
Expired / Lapsed
US
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Optical multiple fiber
Assignee: Dainichi Nippon Cables Ltd
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Filing: 1983-02-26
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Granted: 1987-09-01
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Expires: 2003-02-26
Abstract
Abstract An optical multiple fiber comprising a multiplicity of optical fibers which are fused together with each other, each optical fiber comprising a core made of pure silica glass and a cladding layer disposed on the core and made of a dopant-containing silica glass, characterized in that the thickness of the cladding layer satisfies the following equation (I): 2 D.sub.1 ≧T.sub.1 ≧1.0 μm. (I) wheren T 1 is the thickness of the cladding layer in μm. and D 1 is the outer diameter of the core in μm., in order to improve the image-transmitting capacity of the multiple fiber, including the sharpness and brightness of transmitted image.
Inventors
- 👤 Hiroyuki Hayami
- 👤 Atsushi Utsumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:32
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/04; G02B6/06
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
140 words
An optical multiple fiber comprising a plurality of optical fibers which are fused together with each other, each optical fiber comprising a core made from pure silica glass and which has a substantially circular cross-section and a cladding layer disposed directly on the core and made of a dopant-containing silica glass having a lower refractive index than the pure silica glass of the core, said cladding layer having a thickness which satisfies the following equation (I): 2D.sub.1 ≧T.sub.1 ≧1.0 μm (I) wherein T 1 is the thickness of the cladding layer in μm and D 1 is the diameter of the core in μm and T 1 ≦D 1 ; the difference in refractive index between the core and the cladding layer being from 0.008 to 0.016 and the diameter of the optical multiple fiber being 5 mm or less.
Claim 2
Dependent Claim
140 words
An optical multiple fiber comprising a plurality of optical fibers which are fused together with each other, each optical fiber comprising a core made from pure silica glass and which has a substantially circular cross-section and a cladding layer disposed directly on the core and made of a dopant-containing silica glass having a lower refractive index than the pure silica glass of the core, said cladding layer having a thickness which satisfies the following equation (I): 2D.sub.1 ≧T.sub.1 ≧1.0 μm (I) wherein T 1 is the thickness of the cladding layer in μm and D 1 is the diameter of the core in μm and T 1 ≦D 1 ; the difference in refractive index between the core and the cladding layer being from 0.008 to 0.016 and the diameter of the optical multiple fiber being 5 mm or less.
Claim 3
Dependent Claim
23 words
The multiple fiber of claim 1, wherein the cladding layer thickness T 1 satisfies the following equation (II): 3.0 μm.≧T.sub.1 ≧1.0 μm. (II)
Claim 4
Dependent Claim
38 words
The multiple fiber of claim 1, wherein the cladding layer thickness T 1 satisfies the above equation (II) and the core volume ratio of each optical fiber as defined by the formula: ##EQU2## is from 20 to 60%.
Claim 5
Dependent Claim
24 words
The multiple fiber of claim 1, wherein the cladding layer thickness T 1 satisfies the following equation (IV): 2D.sub.1 ≧T.sub.1 ≧0.05D.sub.1 +1.0 μm. (IV)
Claim 6
Dependent Claim
26 words
The multiple fiber of claim 1, 2, 3 or 4, wherein each optical fiber further has a silica glass support layer disposed on the cladding layer.
Claim 7
Dependent Claim
33 words
The multiple fiber of claim 1, 2, 3 or 4, which has a silica glass skin layer having a thickness of 10 to 300 μm. as an outermost layer of the multiple fiber.
Claim 8
Dependent Claim
29 words
The multiple fiber of claim 5, which has a silica glass skin layer having a thickness of 10 to 300 μm. as an outermost layer of the multiple fiber.
Claim 9
Dependent Claim
47 words
The multiple fiber of claim 1, 2, 3 or 4, wherein the multiple fiber has a silica glass skin layer having a thickness of 10 to 300 μm. as an outermost layer thereof; and the outer diameter of the multiple fiber is from 0.5 to 3 mm.
Claim 10
Dependent Claim
43 words
The multiple fiber of claim 5, wherein the multiple fiber has a silica glass skin layer having a thickness of 10 to 300 μm. as an outermost layer thereof; and the outer diameter of the multiple fiber is from 0.5 to 3 mm.
Claim 11
Dependent Claim
77 words
The multiple fiber of claim 7, wherein the multiple fiber is composed of 1,000 to 30,000 optical fibers each having a silica glass support layer thickness T 2 of 0.01 to 1.0 μm.; the silica glass skin layer is made of a silica glass having a drawable temperature of not less than 1,800° C. and having a thickness of 10 to 300 μm.; and the outer diameter of the multiple fiber is from 0.5 to 3 mm.
Claim 12
Dependent Claim
23 words
The multiple fiber of claim 1 or 2, wherein the multiple fiber comprises from about 1,000 to about 30,000 of said optical fibers.
Claim 13
Dependent Claim
23 words
The multiple fiber of claim 2, wherein the cladding layer thickness T 1 satisfies the following equation (III): 2.3 μm≧T.sub.1 ≧1.5 μm. (III)
Claim 14
Dependent Claim
20 words
The multiple fiber of claim 11, wherein the thickness T 1 of the cladding layer is at least 1.3 μm.
Claim 15
Dependent Claim
20 words
The multiple fiber of claim 11, wherein the thickness T 1 of the cladding layer is at least 1.5 μm.
Claim 16
Dependent Claim
20 words
The multiple fiber of claim 11, wherein the thickness T 1 of the cladding layer is at least 1.8 μm.
Claim 17
Dependent Claim
24 words
The multiple fiber of claim 4, wherein the cladding layer thickness T 1 satisfies the following equation (V): 2D.sub.1 ≧T.sub.1 ≧0.06D.sub.1 +1.0 μm. (V).
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