Fiber optic cable breakout configuration with tensile reinforcement

• US 7,609,925 B2
• Filed: 04/12/2007
• Issued: 10/27/2009
• Est. Priority Date: 04/12/2007
• Status: Active Grant

• Current Assignee: CommScope Technologies, LLC (CommScope Holding Company, Inc.)
• Original Assignee: ADC Telecommunications Incorporated (TE Connectivity Limited)
• Inventors: Gronvall, Erik, Lu, Yu, Carlson, Scott, Schmidt, Andy, Suek, Paul
• Primary Examiner(s): KIANNI, KAVEH C
• Application Number:
  US11/787,218
• Publication Number:
  US 20080253729A1
• Time in Patent Office: 929 Days
• Field of Search: 385/100, 385/113, 385/106
• US Class Current: 385/100
• CPC Class Codes: G02B 6/4472 Manifolds

Abstract

The present disclosure relates to a fiber optic telecommunications cable assembly including a main fiber optic cable and a tether cable that branches from the main fiber optic cable at a breakout location. The breakout location includes a breakout block mounted to the main fiber optic cable, a tether retention block mounted to the main fiber optic cable, and a sleeve positioned outside the main fiber optic cable that extends from the breakout block to the tether retention block. An optical fiber structure extends from the main fiber optic cable, through the breakout block, through the sleeve and through the tether retention block to the tether cable. The fiber optic telecommunications cable assembly also includes a tensile reinforcing structure that extends from the breakout block to the retention block for preventing a spacing between the breakout block and the retention block from exceeding a predetermined amount. The tensile reinforcing structure is positioned outside the main fiber optic cable and has portions anchored to the breakout block and the retention block. The fiber optic telecommunications cable assembly further includes an over-mold that covers the breakout block, the sleeve, the retention block, the tensile reinforcing structure and at least a portion of the main fiber optic cable.

Claims

1. A fiber optic telecommunications cable assembly comprising:

a main fiber optic cable including a first set of strength members, the first set of strength members including at least one cable strength member continuing along the main fiber optic cable within a radial boundary defined by an inner surface of a cable jacket of the main fiber optic cable;

a tether cable;

a breakout block mounted to the main fiber optic cable;

a retention block mounted to the main fiber optic cable, the tether cable being secured to the retention block;

a sleeve positioned outside the main fiber optic cable that extends from the breakout block to the retention block;

an optical fiber structure that extends from the main fiber optic cable, through the breakout block, through the sleeve and through the retention block to the tether cable;

a tensile reinforcing structure including a second set of strength members, the second set of strength members including at least one tensile reinforcing member that extends solely between the breakout block and the retention block for preventing a spacing between the breakout block and the retention block from exceeding a predetermined amount, the tensile reinforcing structure being radially positioned outside the radial boundary of the main fiber optic cable, and the at least one tensile reinforcing member of the tensile reinforcing structure having a first portion anchored to the breakout block and a second portion anchored to the retention block; and

an over-mold that covers the breakout block, the sleeve, the retention block, the tensile reinforcing structure and at least a portion of the main fiber optic cable;

wherein the breakout block includes at least one outwardly projecting securing member for use in securing the at least one tensile reinforcing member of the tensile reinforcing structure to the breakout block; and

wherein the retention block also includes at least one of the outwardly projecting securing members for use in securing the at least one tensile reinforcing member of the tensile reinforcing structure to the retention block.

2. The fiber optic telecommunications cable assembly of claim 1, wherein the at least one tensile reinforcing member of the tensile reinforcing structure has a string-like configuration.

3. The fiber optic telecommunications cable assembly of claim 1,

wherein the at least one tensile reinforcing member of the tensile reinforcing structure includes aramid yarn.

4. The fiber optic telecommunications cable assembly of claim 1, wherein the first and the second portions of the at least one tensile reinforcing member of the tensile reinforcing structure are also anchored to the breakout block and the retention block by being wrapped around the breakout block and the retention block respectively.

5. The fiber optic telecommunications cable assembly of claim 1, wherein the at least one tensile reinforcing member of the tensile reinforcing structure includes a first tensile reinforcing length positioned at a first side of the main fiber optic cable and a second tensile reinforcing length positioned at a second side of the main fiber optic cable, the first side of the main fiber optic cable being opposite from the second side of the main fiber optic cable.

6. The fiber optic telecommunications cable assembly of claim 5, wherein the first and second tensile reinforcing lengths are generally parallel to the main fiber optic cable.

7. The fiber optic telecommunications cable assembly of claim 5, wherein the first and second tensile reinforcing lengths are part of a continuous length of the tensile reinforcing member.

8. The fiber optic telecommunications cable assembly of claim 7,

wherein the tensile reinforcing member includes aramid yarn.

9. The fiber optic telecommunications cable assembly of claim 1, wherein the at least one tensile reinforcing member of the tensile reinforcing structure is wrapped about the securing members.

10. The fiber optic telecommunications cable assembly of claim 1, wherein the at least one tensile reinforcing member of the tensile reinforcing structure is tied to the securing members.

11. The fiber optic telecommunications cable assembly of claim 1, wherein the securing members include posts.

12. The fiber optic telecommunications cable assembly of claim 11, wherein the breakout block includes at least two posts.

13. The fiber optic telecommunications cable assembly of claim 11, wherein the posts are centered along a plane that bisects the breakout block and also bisects the retention block.

14. The fiber optic telecommunications cable assembly of claim 1, wherein the breakout block includes at least two securing members positioned at a first side of the breakout block and at least one securing member positioned at an opposite second side of the breakout block.

17. The fiber optic telecommunications cable assembly of claim 1, wherein the at least one cable strength member of the first set of strength members of the main fiber optic cable is a central strength member.

18. The fiber optic telecommunications cable assembly of claim 1, wherein the first set of strength members of the main fiber optic cable is configured as a strength layer.

19. The fiber optic telecommunications cable assembly of claim 1, wherein the second set of strength members of the tensile reinforcing structure is bonded to at least one of the breakout block or the retention block.

15. A fiber optic telecommunications cable assembly comprising:

a main fiber optic cable including a first set of strength members, the first set of strength members including at least one cable strength member continuing along the main fiber optic cable within a boundary defined by an outer surface of a cable jacket of the main fiber optic cable prior to stripping away the cable jacket at a stripped region;

a tether cable;

a breakout piece mounted to the main fiber optic cable, the breakout piece including at least one outwardly projecting securing member;

a retention piece mounted to the main fiber optic cable, the tether cable being secured to the retention piece, the retention piece also including at least one of the outwardly projecting securing members;

an optical fiber structure that extends from the main fiber optic cable, through the breakout piece and the retention piece to the tether cable;

a second set of strength members including a string-like tensile reinforcing member that extends between the breakout piece and the retention piece, the tensile reinforcing member not being a part of the main fiber optic cable and including at least a portion positioned outside the boundary defined by the outer surface of the cable jacket of the main fiber optic cable, and the tensile reinforcing member having portions anchored to the at least one of the outwardly projecting securing members of the breakout piece and the at least one of the outwardly projecting securing members of the retention piece; and

an over-mold that covers the breakout piece, the retention piece, the tensile reinforcing member and at least a portion of the main fiber optic cable.

16. The fiber optic telecommunications cable assembly of claim 15,

wherein the tensile reinforcing member includes aramid yarn.

20. The fiber optic telecommunications cable assembly of claim 15, wherein the at least one cable strength member of the first set of strength members of the main fiber optic cable is a central strength member.

21. The fiber optic telecommunications cable assembly of claim 15, wherein the string-like tensile reinforcing member is bonded to at least one of the breakout piece or the retention piece.

22. A fiber optic telecommunications cable assembly comprising:

a main fiber optic cable having a central axis and an outer jacket, the main fiber optic cable defining a first radial dimension that extends from the central axis to an outer surface of the outer jacket;

a tether cable;

a breakout block mounted to the main fiber optic cable, the breakout block including at least one outwardly projecting securing member;

a retention block mounted to the main fiber optic cable, the tether cable being secured to the retention block, the retention block also including at least one of the outwardly projecting securing members;

a sleeve positioned outside the main fiber optic cable that extends from the breakout block to the retention block;

an optical fiber structure that extends from the main fiber optic cable, through the breakout block, through the sleeve and through the retention block to the tether cable;

a tensile reinforcing member that extends from the breakout block to the retention block for preventing a spacing between the breakout block and the retention block from exceeding a predetermined amount, the tensile reinforcing member being positioned outside the main fiber optic cable and being spaced from the central axis of the main fiber optic cable by a second radial dimension that is larger in magnitude than the first radial dimension, the tensile reinforcing member having portions anchored to the at least one outwardly projecting securing members of the breakout block and the retention block; and

an over-mold that covers the breakout block, the sleeve, the retention block, the tensile reinforcing member and at least a portion of the main fiber optic cable.

23. The fiber optic telecommunications cable assembly of claim 22, wherein the tensile reinforcing member is a string-like member.

24. The fiber optic telecommunications cable assembly of claim 22, wherein the tensile reinforcing member is a string.

25. The fiber optic telecommunications cable assembly of claim 22, wherein the tensile reinforcing member includes aramid yarn.