EP0125828A1
Expired / Lapsed
EP
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Optical fiber and process for producing the same
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1984-04-30
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Granted: —
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Expires: 2004-04-30
Abstract
Abstract An optical fiber comprising core glass (1) having therearound a cladding (3) comprising fluorine-containing quartz glass and a process for producing the same are disclosed. Said cladding is composed of an inner portion (to) having a prescribed thickness and a constant fluorine content through its thickness, and an outer portion (t) having its fluorine content gradually decreased in a radial direction so that its outermost surface has a fluorine content of about 0.7% by weight or less relative to SiO 2 .
Inventors
- 👤 Gotaro C/O Yokohama Works Tanaka
- 👤 Kunio C/O Yokohama Works Fujiwara
- 👤 Yasuo C/O Yokohama Works Matsuda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 05:07
CPC Classifications
G; G03; G03F; G03F9/00; G03F9/70; G02; G02B; G02B6/00; G02B6/02; G02B6/036; G02B6/03616; G02B6/03622; G02B6/03627; C; C03; C03B; C03B23/00; C03B23/04; C03B23/047; C03B37/00; C03B37/01; C03B37/012; C03B37/01205; C03B37/01211; C03B37/01214; C03B37/014; C03C; C03C13/00; C03C13/04; C03C13/045; G02B6/028; G02B6/0281; H; H10; H10P; H10P95/00; C03B2201/00; C03B2201/06; C03B2201/08; C03B2201/12; C03B2203/00; C03B2203/10; C03B2203/22; C03B2203/23
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
70 words
An optical fiber comprising core glass having therearound a cladding comprising fluorine-containing quartz glass, wherein said cladding is composed of an inner portion having a prescribed thickness and a constant fluorine content through said thickness and an outer portion having its fluorine content gradually decreasing in a radial direction so that its outermost surface has a fluorine content of about 0.7% by weight or below relative to SiO 2 .
Claim 2
Dependent Claim
70 words
An optical fiber comprising core glass having therearound a cladding comprising fluorine-containing quartz glass, wherein said cladding is composed of an inner portion having a prescribed thickness and a constant fluorine content through said thickness and an outer portion having its fluorine content gradually decreasing in a radial direction so that its outermost surface has a fluorine content of about 0.7% by weight or below relative to SiO 2 .
Claim 3
Dependent Claim
103 words
A process for producing an optical fiber, which comprises forming an inner portion of a quartz glass layer for a cladding containing a prescribed amount of fluorine around the periphery of a glass rod for a core to a prescribed thickness, forming an outer portion of a quartz glass layer for a cladding around the periphery of the inner portion while gradually decreasing the fluorine content of the fluorine-containing quartz glass layer to about 0.7% by weight or below relative to SiO2in the outermost surface of the quartz glass layer, and drawing the resulting core-cladding structure so as to have a prescribed diameter.
Claim 4
Dependent Claim
103 words
A process for producing an optical fiber, which comprises forming an inner portion of a quartz glass layer for a cladding containing a prescribed amount of fluorine around the periphery of a glass rod for a core to a prescribed thickness, forming an outer portion of a quartz glass layer for a cladding around the periphery of the inner portion while gradually decreasing the fluorine content of the fluorine-containing quartz glass layer to about 0.7% by weight or below relative to SiO2in the outermost surface of the quartz glass layer, and drawing the resulting core-cladding structure so as to have a prescribed diameter.
Claim 5
Dependent Claim
48 words
A process as claimed in Claim 2, wherein the core-cladding structure is inserted in a quartz glass tube, the structure is united with said quartz glass tube. by heating to form a core-cladding-jacket structure, and said core-cladding jacket structure is drawn so as to have a prescribed diameter.
Claim 6
Dependent Claim
12 words
The features herein described, or their equivalents, in any patentably novel selection.
Claim 7
Dependent Claim
12 words
The features herein described, or their equivalents, in any patentably novel selection.
References Cited (Backward Citations)
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