Fiber optic cable having a ripcord

• US 20030118295A1
• Filed: 12/26/2001
• Published: 06/26/2003
• Est. Priority Date: 12/26/2001
• Status: Active Grant

• Current Assignee: Corning Optical Communications LLC (Corning Incorporated)
• Original Assignee: Corning Cable Systems LLC (Corning Incorporated)
• Inventors: Peterson, Roger K., Strong, Patrick K., Caldwell, William E., Wagman, Richard S., Hedrick, Douglas S., Blazer, Bradley J., Lail, Jason C., Greenwood, Jody L.
• Granted Patent: US 6,813,421 B2
• Time in Patent Office: Days
• US Class Current: 385/101
• CPC Class Codes: G02B 6/4411 Matrix structure
• CPC Class Codes: G02B 6/4416 Heterogeneous cables
• CPC Class Codes: G02B 6/4431 with provision in the protective covering, e.g. weak line, for gaining access to one or more fibres, e.g. for branching or tapping break-out terminations G02B6/4471
• CPC Class Codes: G02B 6/562 locatable, e.g. using magnetic means

Abstract

A fiber optic cable including a cable core having at least one optical fiber and a ripcord. In one embodiment, the ripcord is a conductive material operative, upon application of a sufficient pulling force, to rip at least one cable component for facilitating access to said at least one optical fiber. In other embodiments, the ripcord is formed from a semi-conductive material, the ripcord is removably attached to at least one cable component, and/or the ripcord has an excess length.

Claims

1. A fiber optic cable, said fiber optic cable comprising:

a cable core having at least one optical fiber;

a ripcord, the ripcord being an electrically conductive material operative, upon application of a sufficient pulling force, to rip at least one cable component for facilitating access to said at least one optical fiber.

2. The fiber optic cable of claim 1, said ripcord having a surface roughness thereon.

3. The fiber optic cable of claim 1, said ripcord having an excess length.

4. The fiber optic cable of claim 1, said ripcord being generally stranded around a longitudinal axis of said fiber optic cable.

5. The fiber optic cable of claim 1, said ripcord including a coating thereon.

6. The fiber optic cable of claim 1, said ripcord having a diameter of at least about 0.012 inches.

7. The fiber optic cable of claim 1, said ripcord being disposed generally adjacent to at least one strength element.

8. The fiber optic cable of claim 1, said ripcord being selected from one of the group of copper, steel, aluminum, and copper-cladded steel.

9. The fiber optic cable of claim 1, said ripcord having a portion thereof embedded within a buffer tube.

10. The fiber optic cable of claim 1, said ripcord being removably attached to at least one cable component.

11. The fiber optic cable of claim 1, said ripcord having a tensile strength being in the range of about 20 ksi to about 230 ksi.

12. A fiber optic cable, said fiber optic cable comprising:

a cable core having at least one optical fiber;

a ripcord, the ripcord having a portion being an electrically semi-conductive material operative, upon application of a sufficient pulling force, to rip at least one cable component for facilitating access to said at least one optical fiber.

13. The fiber optic cable of claim 12, said ripcord having an excess length.

14. The fiber optic cable of claim 12, said ripcord being generally stranded around a longitudinal axis of said fiber optic cable.

15. The fiber optic cable of claim 12, said ripcord including a coating thereon.

16. The fiber optic cable of claim 12, said ripcord having a diameter of at least about 0.012 inches.

17. The fiber optic cable of claim 12, said ripcord being disposed generally adjacent to at least one strength element.

18. The fiber optic cable of claim 12, said ripcord being a carbon fiber.

19. The fiber optic cable of claim 12, said ripcord having a portion thereof embedded within a buffer tube.

20. The fiber optic cable of claim 12, said ripcord being removably attached to at least one cable component.

21. The fiber optic cable of claim 12, said ripcord further comprising a composite material.

22. The fiber optic cable of claim 21, said ripcord having a resistivity being in the range of about 150 micro-ohms per centimeter to about 3000 micro-ohms per centimeter.

23. A fiber optic cable, said fiber optic cable comprising:

a cable core having at least one optical fiber;

a ripcord, the ripcord having an excess length with respect to an associated portion of the fiber optic cable and being operative, upon application of a sufficient pulling force, to rip at least one cable component for facilitating access to said at least one optical fiber.

24. The fiber optic cable of claim 23, said ripcord being a conductive material.

25. The fiber optic cable of claim 23, said ripcord being selected from one of the group of copper, steel, aluminum, and copper-cladded steel.

26. The fiber optic cable of claim 23, said ripcord being a dielectric material.

27. The fiber optic cable of claim 23, said ripcord being a portion of a semi-conductive material.

28. The fiber optic cable of claim 23, said ripcord including a coating thereon.

29. The fiber optic cable of claim 23, said ripcord having a portion thereof embedded within a cable component.

30. The fiber optic cable of claim 23, said ripcord having a portion thereof attached to a cable component.

31. The fiber optic cable of claim 23, said excess length being proximate to a switchback portion of the fiber optic cable.