US3712705A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air clad optical fiber waveguide
Assignee: AT&T Inc
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Filing: 1971-05-28
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Granted: 1973-01-23
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Expires: 1991-05-28
Abstract
Abstract An air clad optical fiber is described comprising a low-loss dielectric core, having a polygonal cross section disposed within a circular jacket. Because of its shape, the core is, in effect, totally surrounded by air, contacting the outer jacket at only its corners. To further minimize the number of contacting regions, and increase the spacing between core and jacket, the latter is made oversized.
Inventors
- 👤 E Marcatili
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:03
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/02; G02B6/10; G02B6/44; G02B6/4401; G02B6/4402; G02B6/032
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
69 words
An optical waveguide comprising: a dielectric core, having an n-sided polygonal cross section, disposed within a circular protective jacket, where n is any integer greater than two; wherein said core contacts said jacket solely along the vertices formed by adjacent pairs of said sides; and wherein the region between said core and said jacket is filled with a gas whose refractive index is less than that of said core.
Claim 2
Dependent Claim
69 words
An optical waveguide comprising: a dielectric core, having an n-sided polygonal cross section, disposed within a circular protective jacket, where n is any integer greater than two; wherein said core contacts said jacket solely along the vertices formed by adjacent pairs of said sides; and wherein the region between said core and said jacket is filled with a gas whose refractive index is less than that of said core.
Claim 3
Dependent Claim
14 words
The waveguide according to claim 1 wherein said core has a rectangular cross section.
Claim 4
Dependent Claim
14 words
The waveguide according to claim 1 wherein said core has a triangular cross section.
Claim 5
Dependent Claim
22 words
The waveguide according to claim 1 wherein the diameter of said jacket is larger than the largest transverse dimension of said core.
Claim 6
Dependent Claim
25 words
The waveguide according to claim 1 wherein the radii of curvature of the sides of said core are greater than the radius of said jacket.
Claim 7
Dependent Claim
11 words
The waveguide according to claim 1 wherein said sides are concave.
References Cited (Backward Citations)
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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) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |