US4603943A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Structure of an optical fiber
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1983-07-06
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Granted: 1986-08-05
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Expires: 2003-07-06
Abstract
Abstract An improved structure of an optical fiber having a core positioned in the center and a surrounding cladding with a lower refractive index than the core is disclosed. A tunnel extending in the axial direction of the optical fiber is provided in two diametrically opposite portions of the core-cladding interface. This fiber permits a single-polarized light to be transmitted only in a single mode.
Inventors
- 👤 Takanori Okoshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:37
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/10; G02B6/105
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
64 words
An optical fiber having a central axis comprising a central core having a first refractive index positioned on said axis, a cladding having a second refractive index lower than said first refractive index surrounding said core, and tunnel means extending parallel to the axis of said fiber comprised of two portions disposed on opposite sides of said core between said core and said cladding.
Claim 2
Dependent Claim
64 words
An optical fiber having a central axis comprising a central core having a first refractive index positioned on said axis, a cladding having a second refractive index lower than said first refractive index surrounding said core, and tunnel means extending parallel to the axis of said fiber comprised of two portions disposed on opposite sides of said core between said core and said cladding.
Claim 3
Dependent Claim
55 words
An optical fiber having an elongated axis comprising a core having a first refractive index located on said axis, a cladding having a second refractive index lower than said first refractive index surrounding said core and tunnel means extending parallel to the axis of said fiber and dividing said core into two spaced apart portions.
Claim 4
Dependent Claim
55 words
An optical fiber having an elongated axis comprising a core having a first refractive index located on said axis, a cladding having a second refractive index lower than said first refractive index surrounding said core and tunnel means extending parallel to the axis of said fiber and dividing said core into two spaced apart portions.
Claim 5
Dependent Claim
66 words
An optical fiber having an elongated axis comprising a central core having a first refractive index disposed on said axis, a cladding having a second refractive index lower than said first refractive index surrounding said core, and tunnel means provided in said core parallel to said axis, said core, cladding and tunnel means defining interfaces which are asymmetric with respect to said axis of said fiber.
Claim 6
Dependent Claim
66 words
An optical fiber having an elongated axis comprising a central core having a first refractive index disposed on said axis, a cladding having a second refractive index lower than said first refractive index surrounding said core, and tunnel means provided in said core parallel to said axis, said core, cladding and tunnel means defining interfaces which are asymmetric with respect to said axis of said fiber.
References Cited (Backward Citations)
US3980390A
Cited
US4046537A
Cited
JPS5212845A
Cited
US4179189A
Cited
JPS54160252A
Cited
GB2045458A
Cited
US4315666A
Cited
JPS56147109A
Cited
US4415230A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-08-04 | 1990-02-03 | 1990-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-04 | 1994-02-03 | 1994-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-04 | 1998-02-03 | 1998-08-05 | $7700.00 | Window Closed / Lapsed |