HIGH COUNT OPTICAL FIBER CABLE

• US 20050244115A1
• Filed: 04/28/2004
• Published: 11/03/2005
• Est. Priority Date: 04/28/2004
• Status: Active Grant

• Current Assignee: Furukawa Electric North America Incorporated (Furukawa Electric Company Limited)
• Original Assignee: Furukawa Electric North America Incorporated (Furukawa Electric Company Limited)
• Inventors: Bocanegra, Luis M., Debban, Harold P. Jr.
• Granted Patent: US 6,973,246 B2
• Time in Patent Office: Days
• US Class Current: 385/110
• CPC Class Codes: G02B 6/441 built up from sub-bundles G02B6/4429, G02B6/4439, G02B6/4479 take precedence

Abstract

An optical fiber cable includes a number of optical fiber bundles. Each bundle contains a number of optical fiber cable units, and a relatively thin skin surrounds the cable units and retains the units in a desired configuration another over the length of the bundle. Each cable unit includes a number of optical fibers, and a first outer jacket that surrounds the fibers. The bundles are protectively enclosed by a second outer jacket of the cable. In an illustrated embodiment, each cable unit has 12 fibers, each bundle contains 12 cable units, and six bundles are protectively enclosed by the second outer jacket, so that the cable contains 432 optical fibers each of which is traceable by color and/or indicia markings.

Claims

1. An optical fiber cable having a central core construvtion wherein strength members that provide tensile strength and rigidity necessary for the cable to carry anticipated loads are embedded in an outer jacket of the cable, comprising:

a number of optical fiber bundles;

each one of the fiber bundles includes a number of optical fiber cable units, and a skin surrounding the cable units in such manner as to retain the units in a desired configuration over a length of the bundle wherein the skin has a thickness of not more than about 0.008 inch (0.2 mm);

each one of the cable units includes a number of optical fibers, and a first outer jacket that protectively surrounds the fibers of the unit wherein the first outer jacket has a thickness of not more than about 0.008 inch (0.2 mm);

a second outer jacket dimensioned and arranged for protectively enclosing the optical fiber bundles; and

one or more strength members embedded in a wall of the second outer jacket along the length of the cable for providing the cable with the necessary tensile strength and rigidity.

3. A cable according to claim 1, wherein one or more of the optical fiber bundles each has a central filler element for keeping the cable units of the bundle in the desired configuration over the length of the bundle.

4. A cable according to claim 1, wherein each one of the optical fiber bundles has an associated first rip cord extending near the inner periphery of the skin of the bundle, for opening the skin and for providing access to the cable units of the bundle.

5. A cable according to claim 4, wherein each one of the optical fiber cable units has an associated second rip cord extending near the inner periphery of the first outer jacket for opening the jacket to expose the optical fibers of the cable unit.

6. A cable according to claim 1, including one or more third rip cords associated with the second outer jacket for opening the jacket to expose the optical fiber bundles inside the cable.

7. A cable according to claim 1, including an organizer element extending centrally along the length of the cable, and the fiber bundles are configured symmetrically about the organizer element.

8. A cable according to claim 1, wherein the skins of the optical fiber bundles are coded for identification.

9. A cable according to claim 1, wherein the optical fibers of the cable units are individually coded for identification.

10. A cable according to claim 1, wherein the first outer jackets of the cable units are coded for identification.

11. A cable according to claim 1, including at least 432 of said optical fibers.

2. (canceled)

12. An optical fiber cable having a central core construction wherein strength members that provide tensile strength and rigidity necessary for the cable to carry anticipated loads are embedded in an outer jacket of the cable, comprising:

a number of optical fiber bundles;

each one of the fiber bundles includes a number of optical fiber cable units, and a skin surrounding the cable units in such manner as to retain the units in a desired configuration over a length of the bundle wherein the skin has a thickness of not more than about 0.008 inch (0.2 mm);

each one of the cable units includes a number of optical fibers, and a first outer jacket that protectively surrounds the fibers of the unit wherein the first outer jacket has a thickness of not more than about 0.008 inch (0.2 mm);

a core tube for containing the optical fiber bundles in a desired configuration over a length of the cable;

a second outer jacket dimensioned and arranged for protectively enclosing the core tube containing the optical fiber bundles; and

one or more strength members embedded in a wall of the second outer jacket along the length of the cable for providing the cable with the necessary tensile strength and rigidity.

16. An optical fiber cable according to claim 12, wherein the strength members embedded in the wall of the second outer jacket of the cable comprise a dielectric material.

17. A cable according to claim 12, wherein one or more of the optical fiber bundles each has a central filler element for keeping the cable units of the bundle in the desired configuration over the length of the bundle.

18. A cable according to claim 12, wherein each one of the optical fiber bundles has an associated first rip cord extending near the inner periphery of the skin of the bundle, for opening the skin and for providing access to the cable units of the bundle.

19. A cable according to claim 18, wherein each one of the optical fiber cable units has an associated second rip cord extending near the inner periphery of the first outer jacket for opening the jacket to expose the optical fibers of the cable unit.

20. A cable according to claim 12, including one or more third rip cords associated with the second outer jacket for opening the jacket to expose the optical fiber bundles inside the cable.

21. A cable according to claim 12, including an organizer element extending centrally along the length of the cable, and the fiber bundles are configured symmetrically about the organizer element.

22. A cable according to claim 12, wherein the skins of the optical fiber bundles are coded for identification.

23. A cable according to claim 12, wherein the optical fibers of the cable units are individually coded for identification.

24. A cable according to claim 12, wherein the first outer jackets of the cable units are coded for identification.

25. A cable according to claim 12, including at least 432 of said optical fibers.

13. (canceled)

14. (canceled)

15. (canceled)