Molded fiber optic cable furcation assemblies, and related fiber optic components, assemblies, and methods

Patent metadata

Field	Value
Publication number	US-8958673-B2
Application number	US-201113161976-A
Country	US
Kind code	B2
Filing date	Jun 16, 2011
Priority date	May 27, 2011
Publication date	Feb 17, 2015
Grant date	Feb 17, 2015

Abstract

Molded fiber optic cable furcation assemblies, and related fiber optic components, assemblies, and methods are disclosed. In one embodiment, an end portion of a fiber optic cable with a portion of a cable jacket removed to expose optical fibers and/or a cable strength member(s) therein and thereafter placing the cable into a mold for creating a molded furcation plug about the end portion of the fiber optic cable. The furcation plug may be overmolded about the end portion of the fiber optic cable. The molded furcation plug can be used to pull a fiber optic cable without damaging the optical fiber(s) disposed within the fiber optic cable. The molded furcation plug is advantageous since it manufactured with fewer parts, without epoxy, and/or without a labor intensive process that may be difficult to automate.

First claim

What is claimed is:

1. A method of preparing a fiber optic cable furcation assembly, comprising the steps of:
providing a fiber optic cable;
removing a portion of a cable jacket from an end portion of the fiber optic cable to form a transition interface exposing end portions of one or more optical fibers and end portions of one or more cable strength members from the cable jacket thereby forming a transition area in the end portion of the fiber optic cable;
molding, within a mold, a furcation plug about the transition area; and
disposing a strain relief device about the cable jacket prior to the molding of the furcation plug; and
abutting a first end of the strain relief device to a first end of the furcation plug.

2. The method of claim 1 , wherein the transition area comprises an end portion of the cable jacket disposed adjacent to a first side of the transition interface, a portion of the exposed end portions of the one or more optical fibers adjacent to a second side of the transition interface, and a portion of the one or more cable strength members adjacent to the second side of the transition interface.

3. The method of claim 1 , wherein the step of molding is an overmolding process.

4. The method of claim 1 , wherein each of the one or more optical fibers are disposed within a sub-unit jacket within the furcation plug.

5. The method of claim 1 , wherein the step of removing a portion of the cable jacket leaves a protective layer on the end portions of one or more optical fibers for the step of molding.

6. The method of claim 1 , wherein the step of molding the furcation plug comprises molding the furcation plug to form one or more flat surfaces on the first end of the furcation plug configured to communicate with the first end of the strain relief device.

7. The method of claim 1 , wherein the mold comprises a platen mold.

8. The method of claim 1 , wherein the step of molding the furcation plug further comprises molding a furcation plug having a rectangular, a round, or an elliptical cross-section orthogonal to a longitudinal axis of the furcation plug.

9. The method of claim 1 , wherein the step of molding the furcation plug further comprises molding a furcation plug having a shoulder surface.

10. A method of preparing a fiber optic cable furcation assembly, comprising the steps of:
providing a fiber optic cable;
removing a portion of a cable jacket from an end portion of the fiber optic cable to form a transition interface exposing end portions of one or more optical fibers and end portions of one or more cable strength members from the cable jacket thereby forming a transition area in the end portion of the fiber optic cable;
molding, within a mold, a furcation plug about the transition area; and
molding a strain relief device upon the cable jacket adjacent to an end of the furcation plug within a second mold, wherein the molding within the mold occurs with a first molding material, and the molding within the second mold occurs with a second molding material of different material from the first molding material.

11. The method of claim 10 , wherein the molding the strain relief device comprises molding, within the second mold, the strain relief device upon the cable jacket integrated to an end of the furcation plug.

12. A method of preparing a fiber optic cable furcation assembly, comprising the steps of:
providing a fiber optic cable;
removing a portion of a cable jacket from an end portion of the fiber optic cable to form a transition interface exposing end portions of one or more optical fibers and end portions of one or more cable strength members from the cable jacket thereby forming a transition area in the end portion of the fiber optic cable; and
molding, within a mold, a furcation plug about the transition area;

wherein the method further comprises the step of twisting the end portions of the one or more cable strength members before the molding.

13. The method of claim 12 , further comprising the step of molding a strain relief device over the cable jacket adjacent to the furcation plug.

14. The method of claim 13 , wherein the furcation plug and the strain relief device are molded to provide the strain relief device integrated with the furcation plug.

15. A method of preparing a fiber optic cable furcation assembly, comprising the steps of:
providing a fiber optic cable;
removing a portion of a cable jacket from an end portion of the fiber optic cable to form a transition interface exposing end portions of one or more optical fibers and end portions of one or more cable strength members from the cable jacket thereby forming a transition area in the end portion of the fiber optic cable;
molding, within a mold, a furcation plug about the transition area;
wherein the method further includes the steps of:
disposing the one or more optical fibers inside a strain relief tube;
disposing a portion of the strain relief tube in the transition area from the second end of the furcation plug prior to the molding the furcation plug; and
molding the furcation plug upon the portion of the strain relief tube.

16. A fiber optic cable assembly, comprising:
a fiber optic cable including one or more optical fibers and one or more cable strength members disposed within a cable jacket, end portions of the one or more optical fibers and end portions of the one or more cable strength members both exposed from an end portion of the cable jacket at a transition interface to form a transition area in an end portion of the fiber optic cable;
a furcation plug molded about the transition area; and
a pulling loop comprising ends of the end portions of the one or more cable strength members disposed through the furcation plug and looped back inside the furcation plug.

17. The fiber optic cable assembly of claim 16 , wherein the transition area comprises an end portion of the cable jacket disposed adjacent to a first side of the transition interface, a portion of the exposed end portions of the one or more optical fibers adjacent to a second side of the transition interface, and a portion of the one or more strength members adjacent to the second side of the transition interface.

18. The fiber optic cable assembly of claim 16 , further comprising one or more sub-unit jackets disposed in the fiber optic cable, each of the one or more optical fibers disposed within a sub-unit jacket among the one or more sub-unit jackets.

19. The fiber optic cable assembly of claim 16 , wherein the furcation plug further comprises a furcation body comprising a tapered cross-section side adjacent to the transition area.

20. The fiber optic cable assembly of claim 16 , further comprising a strain relief device disposed upon the cable jacket and including a first end configured to be abutted to an end of the furcation plug.

21. The fiber optic cable assembly of claim 20 , further comprising one or more flat surfaces disposed on a first end of the furcation plug disposed adjacent to the first end of the strain relief device.

22. The fiber optic cable assembly of claim 16 , further comprising
a strain relief tube receiving the one or more optical fibers, a portion of the strain relief tube disposed in an end of the furcation plug and molded into the furcation plug.

Assignees

• Cline Timothy S
• Cooke Terry L
• Klavuhn Tory A
• Tooley Mario L
• Corning Cable Sys Llc

Inventors

• Cline Timothy S
• Cooke Terry L
• Klavuhn Tory A
• Tooley Mario L

Classifications

• G02B6/44785

  Cable clamps · CPC title

• G02B6/4477

  with means for strain-relieving to interior strengths element · CPC title

• G02B6/3889 Primary

  using encapsulation for protection, e.g. adhesive, molding or casting resin · CPC title

• G02B6/4471 Primary

  Terminating devices (demountable connectors G02B6/3807); Cable clamps · CPC title