Patent US4385802A successfully refreshed from Google Patents.
US4385802A
Expired / Lapsed
US
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Long wavelength, low-loss optical waveguide
Assignee: Corning Glass Works
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Filing: 1980-06-09
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Granted: 1983-05-31
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Expires: 2000-06-09
Abstract
Abstract An optical fiber waveguide of the type comprising an outer cladding layer, an axially disposed core of SiO 2 doped with GeO 2 and a first inner cladding layer of SiO 2 doped with an oxide such as P 2 O 5 for lowering the preform processing temperature. A second inner cladding layer of pure SiO 2 is disposed between the first inner cladding layer and the core to prevent P 2 O 5 from diffusing into the core, thereby eliminating absorption losses from the P--O--H band in the 1.1-1.8 μm region.
Inventors
- 👤 Paul E. Blaszyk
- 👤 Robert Olshansky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:51
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/02; G02B6/036; G02B6/03694; C; C03; C03B; C03B37/00; C03B37/01; C03B37/012; C03B37/014; C03B37/018; C03B37/01807; C03C; C03C13/00; C03C13/04; C03C13/045; G02B6/03616; G02B6/03638; G02B6/03644; G02B6/10; G02B6/102; C03B2201/00; C03B2201/02; C03B2201/06; C03B2201/08; C03B2201/10; C03B2201/12; C03B2201/20; C03B2201/28; C03B2201/30; C03B2201/31; C03B2203/00; C03B2203/10; C03B2203/22; C03B2203/23
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
146 words
A single-mode optical fiber waveguide for use in the infrared region of the electromagnetic spectrum, said waveguide being of the type comprising a first glass cladding layer, a second glass cladding layer disposed on the inner wall surface of said first layer, the softening temperature of said second layer being less than that of said first layer, an axially disposed core of SiO 2 doped with GeO 2 to increase the refractive index thereof, the resultant core glass exhibiting relatively low attenuation losses at wavelengths between 1.1 and 1.8 μm, the improvement comprising a third layer of pure SiO 2 disposed between said second glass cladding layer and said core, the refractive index of said SiO 2 layer being equal to or less than that of said second cladding layer, the minimum thickness of said third layer being about 1.5 times the radius of said core.
Claim 2
Dependent Claim
146 words
A single-mode optical fiber waveguide for use in the infrared region of the electromagnetic spectrum, said waveguide being of the type comprising a first glass cladding layer, a second glass cladding layer disposed on the inner wall surface of said first layer, the softening temperature of said second layer being less than that of said first layer, an axially disposed core of SiO 2 doped with GeO 2 to increase the refractive index thereof, the resultant core glass exhibiting relatively low attenuation losses at wavelengths between 1.1 and 1.8 μm, the improvement comprising a third layer of pure SiO 2 disposed between said second glass cladding layer and said core, the refractive index of said SiO 2 layer being equal to or less than that of said second cladding layer, the minimum thickness of said third layer being about 1.5 times the radius of said core.
Claim 3
Dependent Claim
39 words
A waveguide in accordance with claim 1 wherein the radius a of said core and the concentration of GeO 2 in said core are such that the quantity ##EQU2## is less than 2.4 at wavelengths greater than 1.1 μm.
Claim 4
Dependent Claim
29 words
A waveguide in accordance with claim 2 wherein said second cladding layer comprises SiO 2 doped with P 2 O 5 , B 2 O 3 or combinations thereof.
Claim 5
Dependent Claim
37 words
A waveguide in accordance with claim 2 wherein said second glass cladding layer comprises SiO 2 doped with P 2 O 5 and additional dopants selected from the group consisting of B 2 O 3 and F.
Claim 6
Dependent Claim
29 words
A waveguide in accordance with claim 1 wherein said second cladding layer comprises SiO 2 doped with P 2 O 5 , B 2 O 3 or combinations thereof.
Claim 7
Dependent Claim
37 words
A waveguide in accordance with claim 1 wherein said second glass cladding layer comprises SiO 2 doped with P 2 O 5 and additional dopants selected from the group consisting of B 2 O 3 and F.
References Cited (Backward Citations)
US4114980A
Cited
US4243298A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-30 | 1986-11-29 | 1987-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-30 | 1990-11-29 | 1991-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-30 | 1994-11-29 | 1995-05-31 | $7700.00 | Window Closed / Lapsed |