US4082420A
Expired / Lapsed
US
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An optical transmission fiber containing fluorine
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1976-01-14
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Granted: 1978-04-04
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Expires: 1996-01-14
Abstract
Abstract A process for producing an optical transmission fiber is provided which comprises feeding highly pure halides, hydrides or organic compounds of Si and B by way of carrier gas on the outer surface of a fused silica rod or a fused silica pipe, or inner surface of a fused silica pipe, oxidizing them and depositing the products to form a pure fused silica layer or a doped fused silica layer containing B 2 O 3 , melting the pipe and the deposited layer followed by a spinning. The SiO 2 layer can alternatively contain fluorine instead of B 2 O 3 . A further SiO 2 layer can be deposited thereon to improve the spinning processability and lower the index of refraction of the B 2 O 3 containing layer.
Inventors
- 👤 Satoshi Shiraishi
- 👤 Kunio Fujiwara
- 👤 Shiro Kurosaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:43
CPC Classifications
C; C03; C03C; C03C13/00; C03C13/04; C03C13/045; B; B29; B29D; B29D11/00; B29D11/00663; C03B; C03B37/00; C03B37/01; C03B37/012; C03B37/014; C03B37/018; C03B37/01807; C03B37/02; C03B37/025; C03B37/027; G; G02; G02B; G02B6/00; G02B6/02; G02B6/036; G02B6/03605; G02B6/03611; G02B6/03616; G02B6/03622; G02B6/03627; C03B2201/00; C03B2201/02; C03B2201/06; C03B2201/08; C03B2201/10; C03B2201/12; C03B2203/00; C03B2203/10; C03B2203/14; C03B2203/16; C03B2203/22
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
83 words
An optical transmission fiber wherein the refractive index varies between the periphery and the central longitudinal axis of the fiber, said variation being symmetrical with respect to the central longitudinal axis of said fiber, said fiber having at least one higher refractive index portion being made mainly of pure fused silica consisting essentially of SiO 2 and at least one lower refractive index portion being made of doped fused silica containing F, said doped fused silica consisting essentially of SiO 2 and F.
Claim 2
Dependent Claim
83 words
An optical transmission fiber wherein the refractive index varies between the periphery and the central longitudinal axis of the fiber, said variation being symmetrical with respect to the central longitudinal axis of said fiber, said fiber having at least one higher refractive index portion being made mainly of pure fused silica consisting essentially of SiO 2 and at least one lower refractive index portion being made of doped fused silica containing F, said doped fused silica consisting essentially of SiO 2 and F.
Claim 3
Dependent Claim
17 words
The optical transmission fiber of claim 1, comprising a further fused silica layer deposited on said fiber.
Claim 4
Dependent Claim
17 words
The optical transmission fiber of claim 1 wherein a further water-repellent glass is deposited on said fiber.
Claim 5
Dependent Claim
19 words
The optical transmission fiber of claim 1 wherein said lower refractive index portion surrounds said higher refractive index portion.
Claim 6
Dependent Claim
47 words
The optical transmission fiber of claim 1 wherein the inner portion of said fiber is said pure fused silica and the F content in the doped fused silica is radially changed in order to obtain a parabolic gradient of the radial distribution of the index of refraction.
Claim 7
Dependent Claim
45 words
A tubular optical transmission fiber comprising an inner cavity, an outer radial portion of doped fused silica containing F, said doped fused silica consisting essentially of SiO 2 and F and an inner radial portion of pure fused silica consisting essentially of SiO 2 .
Claim 8
Dependent Claim
45 words
A tubular optical transmission fiber comprising an inner cavity, an outer radial portion of doped fused silica containing F, said doped fused silica consisting essentially of SiO 2 and F and an inner radial portion of pure fused silica consisting essentially of SiO 2 .
Claim 9
Dependent Claim
18 words
The tubular optical transmission fiber of claim 6, wherein a further fused silica is deposited on said fiber.
Claim 10
Dependent Claim
18 words
The tubular optical transmission fiber of claim 6 wherein a further water-repellent glass is deposited on said fiber.
Claim 11
Dependent Claim
25 words
The tubular optical transmission fiber of claim 6, wherein the cavity within said inner radial portion of said tube is filled with doped fused silica.
Claim 12
Dependent Claim
18 words
The tubular optical transmission fiber of claim 9, wherein a further water-repellent glass is deposited on said fiber.
Claim 13
Dependent Claim
18 words
The tubular optical transmission fiber of claim 9, wherein a further fused silica is deposited on said fiber.
Claim 14
Dependent Claim
23 words
The tubular optical transmission fiber of claim 9, wherein said doped fused silica in said inner radial portion of said tube contains F.
Claim 15
Dependent Claim
17 words
The tubular optical transmission fiber of claim 12, wherein a water-repellent glass is deposited on said fiber.
Claim 16
Dependent Claim
18 words
The tubular optical transmission fiber of claim 12, wherein a further fused silica is deposited on said fiber.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-04-03 | 1981-10-03 | 1982-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-03 | 1985-10-03 | 1986-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-03 | 1989-10-03 | 1990-04-04 | $7700.00 | Window Closed / Lapsed |