Fiber optic splice organizer

• US 4,498,732 A
• Filed: 05/25/1982
• Issued: 02/12/1985
• Est. Priority Date: 01/15/1982
• Status: Expired due to Fees

• Current Assignee: Raychem Limited (TE Connectivity Limited)
• Original Assignee: Raychem Limited (TE Connectivity Limited)
• Inventors: Campbell, Bruce D., Fentress, Vernon A.
• Primary Examiner(s): Sikes, William L.
• Assistant Examiner(s): Gonzalez, Frank
• Application Number:
  US06/381,825
• Time in Patent Office: 994 Days
• Field of Search: 350/96.20, 350/96.21
• US Class Current: 385/135
• CPC Class Codes: G02B 6/4478 Bending relief means

Abstract

A method and device for organizing a bight of an optical fiber and the like at a splice or slack point is provided. The method comprises wrapping the bight about a cylindrical core to form a helix or a pair of helices of opposite handedness, thereby both minimizing the diameter of a container necessary to enclose that bight and maximizing the bend radius of the fiber. The bight may be laid on a sheet for convenient wrapping, and a plurality of fibers per sheet, sheets per core, or cores per splice may be used if the number of fibers to be organized is large. A ready means of encapsulation is also provided.

Claims

1. A device for helically wrapping an optical fiber about a cylindrical core, comprising:

(a) a cylindrical core having a radius of which is less than the minimum bending radius of said fiber

(b) a sheet of flexible material, which sheet is attached longitudinally to said core along one edge of the sheet, and is wrapped around said cylindrical core, said optical fiber being arranged on said sheet such that when said sheet is wrapped about said core a minimum helical pitch angle, θ

, of said fiber is determined from r'"'"'=r/cos θ

where r'"'"' is the minimum bending radius of the fiber and r is the radius of the core.

2. The device of claim 1 wherein said core is tapered at at least one end thereof.

3. The device of claim 1 wherein said sheet possesses indicia thereon to identify said fiber associated therewith.

4. The device of claim 1 wherein said sheet possesses guide lines thereon to aid the arrangement of said fiber thereon.

5. The device of claim 1 wherein a plurality of sheets are attached to said core.

6. The device of claim 1 wherein said sheet comprises a plurality of laminae.

7. The device of claim 6 wherein at least one pair of said laminae are fused to form a tube for receiving said fiber therein.

8. An optical fiber organizer kit having component parts capable of being assembled for organizing a bight in an optical fiber between two points, the kit comprising the combination of:

(a) a cylindrical core having a length adapted to be inserted on an axis between said two points and having a radius which is less than the minimum bending radius of said fiber; and

(b) a sheet of flexible material adapted to have said optical fiber arranged thereon and to be wrapped about said core, said sheet being wrapped around said core, said optical fiber being arranged on said sheet such that when said sheet is wrapped about said core a minimum helical pitch angle, θ

, of said fiber is determined from r'"'"'=r/cos θ

where r'"'"' is the minimum bending radius of the fiber and r is the radius of the core.

9. A fiber optic cable joint kit having component parts capable of being assembled for forming a joint between two fiber optic cables, said cables each comprising an optical fiber surrounded by an outer jacket wherein a portion of the outer jacket is removed to expose said fiber, the kit comprising the combination of:

(a) a cylindrical core having a length adapted to be placed between the ends of the jacketed portions of said cables and having a radius which is less than the minimum bending radius of said fiber;

(b) a sheet of flexible material adapted to have said optical fiber arranged thereon when said fiber has been joined to be wrapped about said core, said sheet being wrapped around said cylindrical core, said optical fiber being arranged on said sheet such that when said sheet is wrapped about said core a minimum helical pitch angle, θ

, of said fiber is determined from r'"'"'=r/cos θ

where r'"'"' is the minimum bending radius of the fiber and r is the radius of the core; and

(c) covering means for covering said joint when said sheet has been wrapped about said core.

10. The kit of claim 9 wherein the covering means comprises a heat-recoverable polymeric sleeve.

11. The kit of claim 10 wherein the heat-recoverable sleeve comprises an integral electrical heating means.

12. A joint between two fiber optic cables, each cable comprising an optical fiber and said optical fibers having been jointed to form a bight, wherein said bight has been organized by being helically wrapped about a cylindrical core positioned generally parallel to the axis between said two cables and having a radius which is less than the minimum bending radius of said fiber, said bight being helically wrapped about said core in such a manner that a minimum helical pitch angle, θ

, of said bight is determined by r'"'"'=r/cos θ

where r'"'"' is the minimum bending radius of the fiber and r is the radius of the core.

13. A method of organizing a bight between two points in an optical fiber, which method comprises helically wrapping said bight about a cylindrical core positioned generally parallel to an axis between said two points wherein the radius of said core is less than the minimum bending radius of said fiber and wherein a minimum helical angle, θ

, of said bight is determined from r'"'"'=r/cos θ

where r'"'"' is the minimum bending radius of the fiber and r is the radius of the core.

14. The method of claim 13 wherein said helical wrapping comprises forming a pair of helices of opposite handedness.

15. The method of claim 13 wherein more than one fiber is organized.

16. The method of claim 13 which further comprises encapsulating said fiber.

17. The method of claim 13 wherein said helical wrapping comprises the steps of:

(a) arranging said fiber on a sheet such that said fiber will become helically wrapped about said core when said sheet is wrapped about said core; and

(b) wrapping said sheet about said core.

18. The method of claim 17 wherein said helical wrapping comprises forming a pair of helices of opposite handedness.

19. The method of claim 17 wherein said sheet is provided with indicia to identify at least one of said fiber arranged thereon.

20. The method of claim 17 which further comprises encapsulating said fiber.

21. The method of claim 17 wherein said sheet comprises a plurality of laminae, and said fiber is placed between a pair of said laminae.

22. The method of claim 21 which further comprises encapsulating said fiber by an encapsulant introduced between said pair of laminae.

23. The method of claim 17 wherein more than one fiber is organized.

24. The method of claim 23 wherein more than one sheet is employed.

25. The method of claim 24 wherein more than one fiber is arranged on at least one of said sheets.

26. A method of making a joint between two fiber optic cables, each cable comprising an optical fiber, which method comprises:

(a) joining said optical fibers, thereby forming a bight;

(b) providing a cylindrical core for organizing said bight wherein a radius of said core is less than the minimum bending radius of said fiber;

(c) helically wrapping said bight about said cylindrical core; and

(d) determining a minimum helical angle, θ

, from r'"'"'=r/cos θ

where r'"'"' is the minimum bending radius of the fiber and r is the radius of the core.

27. The method of claim 26 which further comprises covering said joint with a covering means.

28. The method of claim 27 wherein the covering means comprises a heat-recoverable polymeric sleeve.

29. The method of claim 28 wherein the heat-recoverable sleeve comprises integral electrical heating means.