Optical fiber cable including interlocking stitch binder

• US 5,165,003 A
• Filed: 06/28/1991
• Issued: 11/17/1992
• Est. Priority Date: 06/28/1991
• Status: Expired due to Term

• Current Assignee: Sumitomo Electric Lightwave Corp. (Sumitomo Corporation)
• Original Assignee: Sumitomo Electric Fiber Optics Corp.
• Inventors: Carter, Thomas L.
• Primary Examiner(s): Lee, John D.
• Application Number:
  US07/722,654
• Time in Patent Office: 508 Days
• Field of Search: 350/96.23, 350/96.24, 174/112, 174/116, 174/117 F, 174/117 M, 174/121 R, 174/122 R, 174/124 R, 385/109-115
• US Class Current: 385/112
• CPC Class Codes: G02B 6/441 built up from sub-bundles G02B6/4429, G02B6/4439, G02B6/4479 take precedence
• CPC Class Codes: G02B 6/443 Protective covering
• CPC Class Codes: G02B 6/4433 Double reinforcement laying in straight line with optical transmission element
• CPC Class Codes: G02B 6/44384 the means comprising water blocking or hydrophobic materials G02B6/4439, G02B6/4479 take precedence
• CPC Class Codes: G02B 6/4482 Code or colour marking

Abstract

An optical fiber cable of the type having a core comprising a plurality of units wherein each unit comprises a plurality of optical fibers extending generally along the cable and a binder wrapped about the unit. A tube containing a waterblocking material therein is provided to enclose the plurality of units, and a jacket is provided to enclose the tube. The improved cable provides for a binder comprising an interlocking stitch formed of one or more yarns to provide improved fiber unit identification and obviate "microbending" losses due to binder tension.

Claims

1. In an optical fiber cable of the type having a core comprising a plurality of units wherein each unit comprises a plurality of optical fibers extending generally along the cable and a binder wrapped about the unit, a tube enclosing said plurality of units and further containing a waterblocking material therein, and a jacket which encloses said tube, the improvement wherein said binder comprises at least one non-helical and non-braided yarn interlocking stitch.

2. An optical fiber cable according to claim 1 said units each comprise a plurality of singular optical fibers assembled together.

3. An optical fiber cable according to claim 1 wherein said units each comprise a plurality of optical fiber ribbons assembled together.

4. An optical fiber cable according to claim 1 wherein said interlocking stitch comprises one yarn.

5. An optical fiber cable according to claim 1 wherein said interlocking stitch comprises at least two yarns of at least two different colors.

6. An optical fiber cable according to claim 1 wherein said interlocking stitch comprises at least two yarns of the same color.

7. An optical fiber cable according to claim 1 wherein said interlocking stitch is wrapped about said unit under little or no tension.

8. An optical fiber cable according to claim 1 wherein said tube and jacket are made of a plastic material.

9. An optical fiber cable according to claim 1 wherein said optical fibers are single mode matched clad optical fibers.

10. An optical fiber cable according to claim 1 comprising a plurality of rigid tension members having a higher Young'"'"'s Modulus and a lower thermal expansion coefficient than said cable and positioned radially outwardly from said tube and extending generally in the lengthwise direction thereof.

11. In an optical fiber cable of the type having a core comprising a plurality of units wherein each unit comprises a plurality of optical fibers extending generally along the cable and a binder wrapped about the unit, a tube which is made of plastic material enclosing said plurality of units and further containing a waterblocking material therein, and a jacket which is made of plastic material and encloses said tube, the improvement wherein said binder comprises at least one non-helical and non-braided interlocking yarn stitch formed from at least two yarns.

12. An optical fiber cable according to claim 11 wherein said units each comprise a plurality of singular optical fibers assembled together.

13. An optical fiber cable according to claim 11 wherein said units each comprise a plurality of optical fiber ribbons assembled together.

14. An optical fiber cable according to claim 11 wherein said at least two yarns are of different colors.

15. An optical fiber cable according to claim 11 wherein said at least two yarns are of the same color.

16. An optical fiber cable according to claim 11 wherein said interlocking stitch is wrapped about said unit under little or no tension.

17. An optical fiber cable according to claim 11 wherein said optical fibers are single mode matched clad fibers.

18. An optical fiber cable according to claim 11 comprising a plurality of rigid tension members having a higher Young'"'"'s Modulus and a lower thermal expansion coefficient than said cable and positioned radially outwardly from said tube and extending generally in the lengthwise direction thereof.