US4881795A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High count optical fiber distribution cable
Assignee: Corning Research and Development Corp
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Filing: 1989-02-03
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Granted: 1989-11-21
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Expires: 2009-02-03
Abstract
Abstract A high count optical fiber distribution cable having a center sub-unit in the form of a single helix and an outside member in the form of a double helix configuration, the cable structure of which results in optical fiber attenuation stability of no more than 0.2 db/km variance in attenation at the operating wavelengths of 1310 nm and 1550 nm between -40° and 70°C.; each sub-unit is composed of one or more optical fiber bearing buffer tubes or cylindrical members stranded about a sub-unit strength member, the sub-unit strength member having an elastic modulus of at least 4,350,000 psi and coefficient of thermal expansion of no more than 25×10 -6 Cm/Cm/°C., the buffer tubes of each sub-unit having a lay length of no less than 100 mm and the subunits themselves as a sub-unit having a lay length of 900 mm, and no less than 300 elongated optical fibers disposed in one or more of the buffer tubes of the sub-units.
Inventors
- 👤 Susan M. Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:29
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/44; G02B6/4439; G02B6/4457; G02B6/4458; G02B6/4401; G02B6/4415
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
186 words
A high count optical fiber distribution cable having optical fiber attenuation stability over a range of temperatures comprising: (a) A center sub-unit comprising a sub-unit center strength member and at least one buffer tube stranded about said center sub-unit forming a single helix, said center strength member having a tensile strength of at least 4,350,000 psi and a coefficient of thermal expansion of no more than 25×10 6 Cm/Cm/°C.; (b) one or more additional sub-units stranded about the center sub-unit each additional sub-unit comprising at least one buffer tube stranded in a double helix configuration and a sub-unit strength member, each buffer tube stranded about said sub-unit strength member and each sub-unit strength member having a tensile strength of at least 4,350,000 psi and a coefficient of thermal expansion of no more than 25×10 6 Cm/Cm/°C.; and, (c) 300 or more elongated optical fibers, in one or more of said buffer tubes, that vary no more than 0.2 db/km in attenuation when said high count optical fiber distribution cable is subjected to temperatures between -40° and 70° C. at wavelengths of 1310 nm and 1550 nm.
Claim 2
Dependent Claim
186 words
A high count optical fiber distribution cable having optical fiber attenuation stability over a range of temperatures comprising: (a) A center sub-unit comprising a sub-unit center strength member and at least one buffer tube stranded about said center sub-unit forming a single helix, said center strength member having a tensile strength of at least 4,350,000 psi and a coefficient of thermal expansion of no more than 25×10 6 Cm/Cm/°C.; (b) one or more additional sub-units stranded about the center sub-unit each additional sub-unit comprising at least one buffer tube stranded in a double helix configuration and a sub-unit strength member, each buffer tube stranded about said sub-unit strength member and each sub-unit strength member having a tensile strength of at least 4,350,000 psi and a coefficient of thermal expansion of no more than 25×10 6 Cm/Cm/°C.; and, (c) 300 or more elongated optical fibers, in one or more of said buffer tubes, that vary no more than 0.2 db/km in attenuation when said high count optical fiber distribution cable is subjected to temperatures between -40° and 70° C. at wavelengths of 1310 nm and 1550 nm.
Claim 3
Dependent Claim
16 words
The distribution cable of claim wherein the number of optical fibers is between 300 and 420.
Claim 4
Dependent Claim
16 words
The distribution cable of claim 1 further including a first jacket circumscribing only the center sub-unit.
Claim 5
Dependent Claim
15 words
The distribution cable of claim 3 further including a second jacket circumscribing the additional sub-units.
Claim 6
Dependent Claim
22 words
The distribution cable of claim 4 further including a plurality of additional strength members disposed between the sub-units and the first jacket.
Claim 7
Dependent Claim
15 words
The distribution cable of claim 1 wherein each sub-unit contains a plurality of buffer tubes.
Claim 8
Dependent Claim
22 words
The distribution cable of claim 6 wherein at least one sub-unit contains an elongated cylindrical member stranded about the sub-unit's strength member.
Claim 9
Dependent Claim
21 words
The distribution cable of claim 6 wherein each tube bears a mark to distinguish it from other tubes in other sub-units.
Claim 10
Dependent Claim
12 words
The distribution cable of claim 8 wherein said mark is a color.
Claim 11
Dependent Claim
18 words
The distribution cable of claim 1 wherein each sub-unit bears a mark to distinguish it from other sub-units.
Claim 12
Dependent Claim
12 words
The distribution cable of claim 10 wherein said mark is a color.
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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) | 1992-11-20 | 1993-05-22 | 1993-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-20 | 1997-05-22 | 1997-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-20 | 2001-05-22 | 2001-11-21 | $7700.00 | Window Closed / Lapsed |