Communication cable having enhanced crush resistance

• US 6,430,344 B1
• Filed: 02/23/2001
• Issued: 08/06/2002
• Est. Priority Date: 02/23/2001
• Status: Expired due to Term

• Current Assignee: Furukawa Electric North America Incorporated (Furukawa Electric Company Limited)
• Original Assignee: Fitel USA Corporation (Furukawa Electric Company Limited)
• Inventors: Weimann, Peter A., Dixon, Lisa A., Small, Richard D., Norris, Richard H.
• Primary Examiner(s): Ngo, Hung N.
• Application Number:
  US09/792,735
• Publication Number:
  US 20020118933A1
• Time in Patent Office: 529 Days
• Field of Search: 385/100-113
• US Class Current: 385/109
• CPC Class Codes: G02B 6/443 Protective covering

Abstract

A communications cable is disclosed herein that includes an outer jacket, and either a core tube or at least one buffer tube. The core tube or at least one buffer tube includes a resin and high aspect ratio fillers that occupy a predetermined volume of the core tube or buffer tubes so as to impart crush resistance to the cable. Further, the core tube or buffer tube may include two layers, an outer layer and an inner layer, in which the outer layer includes both a resin and high aspect ratio fillers, and the inner layer includes the resin without the high aspect ratio fillers.

Claims

1. A fiber optic cable comprising:

an outer jacket for the cable; and

a core tube, wherein the core tube comprises

a plurality of optical fibers;

a resin; and

high aspect ratio clay fillers occupying a predetermined volume of the core tube so as to impart crush resistance to the cable.

13. The cable of claim 1, wherein the filler is at least approximately 97.5% pure.

28. The cable of claim 1, wherein the filler is at least approximately 97.5% pure.

2. A fiber optic cable comprising:

an outer jacket for the cable; and

a core tube, wherein the core tube comprises

a plurality of optical fibers,

a resin, and

high aspect ratio fillers occupying a predetermined volume of the core tube so as to impart crush resistance to the cable, wherein the fillers are smectite clay.

3. The cable of claim 2, wherein the smectite clay fillers are selected from the group consisting of:

montmorillonite, kaolinite, hectorite, synthetic smectite clays and bentonite.

4. A fiber optic cable comprising:

an outer jacket for the cable; and

a core tube, wherein the core tube comprises

a plurality of optical fibers,

a resin, and

high aspect ratio fillers occupying a predetermined volume of the core tube so as to impart crush resistance to the cable, wherein the fillers comprise a surface that is organophilic.

5. The cable of claim 4, wherein the fillers are surface-treated to render the filler surface less polar.

6. The cable of claim 4, wherein the fillers are surface-treated with a functional amine that is compatible with the resin.

7. A fiber optic cable comprising:

an outer jacket for the cable; and

a core tube, wherein the core tube comprises

a plurality of optical fibers,

a resin, and

high aspect ratio fillers occupying a predetermined volume of the core tube so as to impart crush resistance to the cable, wherein the aspect ratio of the fillers is at least 10.

8. A fiber optic cable comprising:

an outer jacket for the cable; and

a core tube, wherein the core tube comprises

a plurality of optical fibers,

a resin, and

high aspect ratio fillers occupying a predetermined volume of the core tube so as to impart crush resistance to the cable, wherein the aspect ratio of the fillers ranges from approximately 100 to approximately 1500.

9. A fiber optic cable comprising:

an outer jacket for the cable; and

a core tube, wherein the core tube comprises

a plurality of optical fibers,

a resin, and

high aspect ratio fillers occupying a predetermined volume of the core tube so as to impart crush resistance to the cable, wherein the thickness of fillers is at least 5×

10<sup>−

10</sup> meter.

10. A fiber optic cable comprising:

an outer jacket for the cable; and

a core tube, wherein the core tube comprises

a plurality of optical fibers,

a resin, and

high aspect ratio fillers occupying a predetermined volume of the core tube so as to impart crush resistance to the cable, wherein the average diameter of the fillers is at least 5×

10<sup>−

9</sup> meter.

11. The cable of claim 10, wherein the average diameter of the fillers is approximately 5×

10<sup>−

8</sup> meter.

12. A fiber optic cable comprising:

an outer jacket for the cable; and

a core tube, wherein the core tube comprises

a plurality of optical fibers,

a resin, and

high aspect ratio fillers occupying a predetermined volume of the core tube so as to impart crush resistance to the cable, wherein the fillers in the core occupy a volume between approximately 0.01% to approximately 18%.

14. A fiber optic cable comprising:

an outer jacket for the cable; and

a core tube, wherein the core tube comprises

a plurality of optical fibers,

a resin, wherein the resin is selected from the group consisting of;

impact-modified polypropylene, polyethylenes, polycarbonate, ethylene-vinyl acetate copolymers, ethylene-ethyl acrylate copolymers, polyvinyl chloride and thermoplastic elastomers, and

high aspect ratio fillers occupying a predetermined volume of the core tube so as to impart crush resistance to the cable.

15. A fiber optic cable comprising:

an outer jacket for the cable; and

a core tube, wherein the core tube comprises

a plurality of optical fibers,

an inner layer including a resin,

an outer layer including a resin and fillers, and

high aspect ratio fillers occupying a predetermined volume of the core tube so as to impart crush resistance to the cable.

16. A fiber optic cable comprising:

an outer jacket for the cable; and

at least one buffer tube, wherein the buffer tube comprises

a plurality of optical fibers;

a resin; and

high aspect ratio clay fillers occupying a predetermined volume of the buffer tube so as to impart crush resistance to the cable.

17. A fiber optic cable comprising:

an outer jacket for the cable; and

a core tube, wherein the core tube comprises

a plurality of optical fibers,

a resin, and

high aspect ratio fillers occupying a predetermined volume of the core tube so as to impart crush resistance to the cable, wherein the fillers are smectite clay.

18. The cable of claim 17, wherein the smectite clay fillers are selected from the group consisting of:

montmorillonite, kaolinite, hectorite, synthetic smectite clays and bentonite.

19. A fiber optic cable comprising:

an outer jacket for the cable; and

a core tube, wherein the core tube comprises

a plurality of optical fibers,

a resin, and

high aspect ratio fillers occupying a predetermined volume of the core tube so as to impart crush resistance to the cable, wherein the fillers comprise a surface that is organophilic.

20. The cable of claim 19, wherein the fillers are surface-treated to render the filler surface less polar.

21. The cable of claim 19, wherein the fillers are surface-treated with a functional amine that is compatible with the resin.

22. A fiber optic cable comprising:

an outer jacket for the cable; and

a core tube, wherein the core tube comprises

a plurality of optical fibers,

a resin, and

high aspect ratio fillers occupying a predetermined volume of the core tube so as to impart crush resistance to the cable, wherein the aspect ratio of the fillers is at least 10.

23. A fiber optic cable comprising:

an outer jacket for the cable; and

a core tube, wherein the core tube comprises

a plurality of optical fibers,

a resin, and

high aspect ratio fillers occupying a predetermined volume of the core tube so as to impart crush resistance to the cable, wherein the aspect ratio of the fillers ranges from approximately 100 to approximately 1500.

24. A fiber optic cable comprising:

an outer jacket for the cable; and

a core tube, wherein the core tube comprises

a plurality of optical fibers,

a resin, and

high aspect ratio fillers occupying a predetermined volume of the core tube so as to impart crush resistance to the cable, wherein the thickness of fillers is at least 5×

10<sup>−

10</sup> meter.

25. A fiber optic cable comprising:

an outer jacket for the cable; and

a core tube, wherein the core tube comprises

a plurality of optical fibers,

a resin, and

high aspect ratio fillers occupying a predetermined volume of the core tube so as to impart crush resistance to the cable, wherein the average diameter of the fillers is at least 5×

10<sup>−

9</sup> meter.

26. The cable of claim 25, wherein the average diameter of the fillers is approximately 5×

10<sup>−

8</sup> meter.

27. A fiber optic cable comprising:

an outer jacket for the cable; and

a core tube, wherein the core tube comprises

a plurality of optical fibers,

a resin, and

high aspect ratio fillers occupying a predetermined volume of the core tube so as to impart crush resistance to the cable, wherein the fillers in the core occupy a volume between approximately 1.5% to approximately 25%.

29. A fiber optic cable comprising:

an outer jacket for the cable; and

a core tube, wherein the core tube comprises

a plurality of optical fibers,

a resin, wherein the resin is selected from the group consisting of;

impact-modified polypropylene, polyethylenes, polycarbonate, ethylene-vinyl acetate copolymers, ethylene-ethyl acrylate copolymers, polyvinyl chloride and thermoplastic elastomers, and

high aspect ratio fillers occupying a predetermined volume of the core tube so as to impart crush resistance to the cable.