Fiber optic cable having a strength member
View Patent ↗A fiber optic cable includes at least one optical waveguide, at least one strength member, and a jacket. The at least one strength member is a material having an average residual angle in the range of about 30 degrees to about 65 degrees during a bending test using a mandrel having a wire ratio (D/d) of about 200. The strength member is suitable, if necessary, for self-attaching to studs, hooks, or the like by bending it therearound and is also suitable for hardware such as P-clamps or other grips. In other embodiments, strength member 14 is annealed to relieve work hardening. Preferred embodiments use a steel strength member with a carbon content between about 0.30 percent to about 0.75 percent. Additionally, a coating may be applied to the strength member for environmental/corrosion protection or conductivity.
1. A fiber optic cable comprising:
at least one optical waveguide;
at least one strength member, the at least one strength member is a material having an average residual angle in the range of about 30 degrees to about 65 degrees during a bending test using a mandrel to wire ratio (D/d) of about 200; and
a jacket.
2. The fiber optic cable of claim 1 , the average residual angle being in the range of about 35 degrees to about 60 degrees.
3. The fiber optic cable of claim 1 , the at least one strength member having a carbon content in the range of about 0.30 percent to about 0.75 percent.
4. The fiber optic cable of claim 1 , the at least one strength member having an average percentage of the bend retained in the range of about 15 percent to about 35 percent during a bending test using a mandrel to wire ratio (D/d) of about 200.
5. The fiber optic cable of claim 1 , the at least one strength member being annealed to reduce work hardening of the at least one strength member.
6. The fiber optic cable of claim 1 , the at least one strength member having a coating.
7. The fiber optic cable of claim 1 , the fiber optic cable being a figure eight cable having a messenger portion and a carrier portion connected by a web.
8. The fiber optic cable of claim 6 , the web having a preferential tear portion.
9. The fiber optic cable of claim 1 , the at least one optical waveguide being selected from the group of a tight-buffered optical fiber, an optical ribbon, and a bundle of optical fibers.
10. The fiber optic cable of claim 1 , the jacket being a material having fillers.
11. The fiber optic cable of claim 1 , the cable being a dry design.
12. A fiber optic cable comprising:
a carrier portion, the carrier portion having at least one optical waveguide;
a messenger portion, the messenger portion having at least one strength member, the at least one strength member being a steel with a carbon content in the range of about 0.30 percent to about 0.75 percent; and
a jacket, the jacket forms part of a carrier packet and part of a messenger jacket, and a web of the jacket connects the carrier jacket with the messenger jacket.
13. The fiber optic cable of claim 12 , further comprising a second carrier section having at least one optical waveguide.
14. The fiber optic cable of claim 12 , further comprising a second messenger section having at least one strength member.
15. The fiber optic cable of claim 12 , the at least one strength member having an average residual angle in the range of about 30 degrees to about 65 degrees during a bending test using a mandrel to wire ratio (D/d) of about 200.
16. The fiber optic cable of claim 12 , the at least one strength member having an average residual angle in the range of about 35 degrees to about 60 degrees during a bending test using a mandrel to wire ratio (D/d) of about 200.
17. The fiber optic cable of claim 12 , the at least one strength member being annealed to reduce work hardening of the at least one strength member.
18. The fiber optic cable of claim 12 , the at least one strength member having a coating.
19. The fiber optic cable of claim 12 , the web of the jacket having a preferential tear portion.
20. The fiber optic cable of claim 12 , the at least one optical waveguide being selected from the group of a tight-buffered optical fiber, an optical ribbon, and a bundle of optical fibers.
21. The fiber optic cable of claim 12 , the jacket being a material having filled materials.
22. The fiber optic cable of claim 12 , the cable being a dry design.
23. The fiber optic cable of claim 12 , the at least one strength member having an average percentage of the bend retained in the range of about 15 percent to about 35 percent during a bending test using a mandrel to wire ratio (D/d) of about 200.
24. A fiber optic cable comprising:
at least one optical waveguide;
at least one strength member, the at least one strength member being a steel that is annealed for relieving stress induced in the manufacturing process, the at least one strength member having a carbon content in the range of about 0.30 percent to about 0.75 percent; and
a jacket.
25. The fiber optic cable of claim 24 , the cable being a dry design.
26. The fiber optic cable of claim 24 , the jacket being formed from a polymeric material having fillers for reducing post-extrusion shrinkage.
27. The fiber optic cable of claim 24 , the at least one strength member having a coating.
28. The fiber optic cable of claim 24 , the at least one strength member having an average residual angle in the range of about 30 degrees to about 65 degrees during a bending test using a mandrel to wire ratio (D/d) of about 200.
29. The fiber optic cable of claim 24 , the at least one strength member having an average residual angle in the range of about 35 degrees to about 60 degrees during a bending test using a mandrel to wire ratio (D/d) of about 200.