Fiber optic cables that kink with small bend radii

• US 7,289,704 B1
• Filed: 10/31/2006
• Issued: 10/30/2007
• Est. Priority Date: 10/31/2006
• Status: Active Grant

• Current Assignee: Corning Optical Communications LLC (Corning Incorporated)
• Original Assignee: Corning Cable Systems LLC (Corning Incorporated)
• Inventors: Wagman, Richard S., McAlpine, Warren W., Seddon, David A., Jackman, William S.
• Primary Examiner(s): HAHM, SARAH UH YOUNG
• Application Number:
  US11/590,504
• Time in Patent Office: 364 Days
• Field of Search: 385100-114
• US Class Current: 385/100
• CPC Class Codes: G02B 6/4429 Means specially adapted for strengthening or protecting the cables

Abstract

Fiber optic cables are disclosed that allow a relatively small bend radius and/or may kink while still preserving optical performance. In one embodiment, the fiber optic cable includes at least one optical fiber, a first strength member, a second strength member, a core material, and a cable jacket. The core material generally surrounds the optical fiber, the first strength member, and the second strength member and the core material is deformable for cushioning the optical fiber. The cable jacket generally surrounds the core material and allows a bending radius of about 10 millimeters or less while maintaining a suitable level of optical performance.

Claims

1. A fiber optic cable comprising:

at least one optical fiber;

a first strength member;

a second strength member;

a core material, the core material generally surrounding the at least one optical fiber, the first strength member, and the second strength member, wherein the core material is deformable for cushioning the at least one optical fiber; and

a cable jacket, the cable jacket generally surrounding the core material, wherein the fiber optic cable allows a bending radius of about 10 millimeters or less while maintaining a suitable level of optical performance.

2. The fiber optic cable of claim 1, wherein the at least one optical fiber is a bend resistant optical fiber.

3. The fiber optic cable of claim 1, wherein the core material has a generally oval shape.

4. The fiber optic cable of claim 1, wherein the first strength member and the second strength member are generally disposed on opposite sides of the at least one optical fiber and kink in a bend radius of about 30 millimeters or less.

5. The fiber optic cable of claim 1, wherein the first strength member has a tensile strength and a compressive strength and the tensile strength is greater than the compressive strength.

6. The fiber optic cable of claim 1, wherein the first strength member has a partial bend memory for retaining a shape after being bent.

7. The fiber optic cable of claim 1, wherein the cable jacket includes at least one notch for tearing the same.

8. The fiber optic cable of claim 1, wherein the fiber optic cable allows the at least one optical fiber to have a strain at a tensile load of about fifty pounds or less.

9. The fiber optic cable of claim 1, wherein the core material has a modulus of about 300 MPa or less.

10. The fiber optic cable of claim 1, wherein the fiber optic cable has a diameter of about 3 millimeters or less.

11. A fiber optic cable comprising:

at least one optical fiber, wherein the at least one optical fiber is a bend resistant optical fiber;

a first strength member, wherein the first strength member has a tensile strength and a compressive strength and the tensile strength is greater than the compressive strength;

a core material, the core material generally surrounding the at least one optical fiber, wherein the core material is deformable for cushioning the at least one optical fiber; and

a cable jacket, the cable jacket generally surrounding the core material, wherein the fiber optic cable kinks in a bend radius of about 30 millimeters or less while maintaining a suitable level of optical performance.

12. The fiber optic cable of claim 11, wherein the core material has a generally oval shape.

13. The fiber optic cable of claim 11, wherein the first strength member and the second strength member are generally disposed on opposite sides of the at least one optical fiber and kink in a bend radius of about 30 millimeters or less.

14. The fiber optic cable of claim 11, further including a second strength member, wherein the at least one optical fiber is generally disposed between the first strength member and the second strength member.

15. The fiber optic cable of claim 11, wherein the first strength member has a partial bend memory for retaining a shape after being bent.

16. The fiber optic cable of claim 11, wherein the cable jacket includes at least one notch for tearing the same.

17. The fiber optic cable of claim 11, wherein the fiber optic cable allows the at least one optical fiber to have a strain at a tensile load of about fifty pounds or less.

18. The fiber optic cable of claim 11, wherein the core material has a modulus of about 300 MPa or less.

19. A fiber optic cable comprising:

at least one optical fiber, wherein the at least one optical fiber is a bend resistant optical fiber;

a first strength member;

a second strength member, wherein the first strength member and the second strength member are generally disposed on opposite sides of the at least one optical fiber and kink in a bend radius of about 30 millimeters or less;

a core material, the core material generally surrounding the at least one optical fiber, the first strength member, and the second strength member, wherein the core material is deformable for cushioning the at least one optical fiber; and

a cable jacket, the cable jacket generally surrounding the core material, wherein the fiber optic cable kinks in a bending radius of about 30 millimeters or less while maintaining a suitable level of optical performance.

20. The fiber optic cable of claim 19, wherein the first strength member has a tensile strength and a compressive strength and the tensile strength is greater than the compressive strength.

21. The fiber optic cable of claim 19, wherein the first strength member has a partial bend memory for retaining a shape after being bent.

22. The fiber optic cable of claim 19, wherein the cable jacket includes at least one notch for tearing the same.

23. The fiber optic cable of claim 19, wherein the fiber optic cable allows the at least one optical fiber to have a strain at a tensile load of about fifty pounds or less.

24. The fiber optic cable of claim 19, wherein the core material has a modulus of about 300 MPa or less.