US4354736A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stress-induced birefringent single mode optical fiber and a method of fabricating the same
Assignee: U S Holding Co Inc
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Filing: 1980-06-18
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Granted: 1982-10-19
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Expires: 2000-06-18
Abstract
Abstract The stress-induced birefringent single mode optical fiber includes an optical core having a high refractive index and a high thermal expansion coefficient. An arrangement formed from an optical material having a low refractive index and a low thermal expansion coefficient is disposed to engage the outer surface of the core tangentially at opposite ends of a diameter of the core to establish a stress therein. Air encompasses the remainder of the outer surface of the core to provide a light guiding cladding for the core and, hence, the fiber itself. The arrangement to establish the stress may include a pair of flat plates engaging the outer surface of the core tangentially which are entrapped in a circular tube which is concentric with the core such that air is entrapped between the plates and the circular tube to provide the light guiding cladding. Alternatively, an elliptical tube is provided to engage the outer surface of the core at the minor axis of the elliptical tube to provide the desired stress in the fiber. In this case air is enclosed in the elliptical tube to provide the light guiding cladding.
Inventors
- 👤 Mokhtar S. Maklad
- 👤 Francis I. Akers
- 👤 William L. Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:57
CPC Classifications
C; C03; C03B; C03B37/00; C03B37/01; C03B37/02; C03B37/025; C03B37/027; C03B37/02709; C03B37/012; C03B37/01205; C03B37/01211; C03B37/01217; C03B37/01225; C03B37/02781; G; G02; G02B; G02B6/00; G02B6/10; G02B6/105; C03B2203/00; C03B2203/02; C03B2203/10; C03B2203/14; C03B2203/30
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
79 words
A stress-induced birefringent single mode optical fiber comprising: an optical core having a high refractive index and a high thermal expansion coefficient; means formed from an optical material having a low refractive index and a low thermal expansion coefficient engaging the outer surface of said core tangentially at opposite ends of a diameter of said core to establish a stress therein; and air encompassing the remainder of the outer surface of said core to provide a light guiding cladding.
Claim 2
Dependent Claim
79 words
A stress-induced birefringent single mode optical fiber comprising: an optical core having a high refractive index and a high thermal expansion coefficient; means formed from an optical material having a low refractive index and a low thermal expansion coefficient engaging the outer surface of said core tangentially at opposite ends of a diameter of said core to establish a stress therein; and air encompassing the remainder of the outer surface of said core to provide a light guiding cladding.
Claim 3
Dependent Claim
69 words
A fiber according to claim 1, wherein said means includes a pair of flat plates each having one surface engaging the outer surface of said core tangentially at a different end of said diameter, and a circular tube concentric with said core enclosing said core and said pair of flat plates, the inner surface of said circular tube engaging both ends of each of said pair of flat plates.
Claim 4
Dependent Claim
23 words
A fiber according to claim 2, wherein said air is disposed between said pair of flat plates to provide said light guiding cladding.
Claim 5
Dependent Claim
35 words
A fiber according to claim 1, wherein said means includes an elliptical tube having its inner surface at its minor axis engaging the outer surface of said core tangentially at opposite ends of said diameter.
Claim 6
Dependent Claim
15 words
A fiber according to claim 4, wherein said air is disposed in said elliptical tube.
Claim 7
Independent Claim
116 words
A method of fabricating a stress-induced birefringent single mode optical fiber comprising the steps of: producing an optical core from an optical material having a high refractive index and a high thermal expansion coefficient; placing said core in an optical component formed from an optical material having a low refractive index and a low thermal expansion coefficient to enable said component to engage the outer surface of said core tangentially at opposite ends of a diameter of said core to establish a stress therein; entrapping air in said component to provide a light guiding cladding for said core when placed in said component; and drawing said core and said component after assembly to provide said fiber.
Claim 8
Independent Claim
116 words
A method of fabricating a stress-induced birefringent single mode optical fiber comprising the steps of: producing an optical core from an optical material having a high refractive index and a high thermal expansion coefficient; placing said core in an optical component formed from an optical material having a low refractive index and a low thermal expansion coefficient to enable said component to engage the outer surface of said core tangentially at opposite ends of a diameter of said core to establish a stress therein; entrapping air in said component to provide a light guiding cladding for said core when placed in said component; and drawing said core and said component after assembly to provide said fiber.
Claim 9
Dependent Claim
94 words
A method according to claim 6, wherein said step of placing includes the steps of placing said core between a pair of flat optical plates having a low refractive index and a low thermal expansion coefficient, one surface of each of said pair of plates engaging the outer surface of said core tangentially at a different end of said diameter, inserting said core and said pair of plates after assembly coaxially into a circular optical tube, and tacking the assembly of said core and said pair of plates in place in said circular tube.
Claim 10
Dependent Claim
20 words
A method according to claim 7, wherein said air is entrapped in said circular tube between said pair of plates.
Claim 11
Dependent Claim
70 words
A method according to claim 6, wherein said step of placing includes the steps of inserting said core coaxially into an elliptical tube having a low refractive index and a low thermal coefficient of expansion, said elliptical tube having its inner surface at its minor axis engaging the outer surface of said core tangentially at opposite ends of said diameter, and tacking said core in place within said elliptical tube.
Claim 12
Dependent Claim
15 words
A method according to claim 9, wherein said air is entrapped in said elliptical tube.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-10-18 | 1986-04-19 | 1986-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-18 | 1990-04-19 | 1990-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-18 | 1994-04-19 | 1994-10-19 | $7700.00 | Window Closed / Lapsed |