Distribution cable having overmolded mid-span access location with preferential bending

• US 20050259929A1
• Filed: 12/29/2004
• Published: 11/24/2005
• Est. Priority Date: 05/24/2004
• Status: Active Grant

• Current Assignee: Corning Optical Communications LLC (Corning Incorporated)
• Original Assignee: Corning Cable Systems LLC (Corning Incorporated)
• Inventors: Luther, James P., Elkins, Robert B. II, Nielsen, Lars K., Theuerkom, Thomas
• Granted Patent: US 7,155,093 B2
• Time in Patent Office: Days
• US Class Current: 385/100
• CPC Class Codes: G02B 6/4475 with provision for lateral branching G02B6/4431 takes precedence

Abstract

A fiber optic distribution cable assembly having at least one factory-prepared mid-span access location for accessing and terminating optical fibers of the distribution cable includes a tether containing at least one optical fiber optically connected to an optical fiber terminated from the distribution cable and an overmolded body encapsulating the distribution cable and a portion of the tether to form the mid-span access location. The mid-span access location is provided with a preferential bend along an axis that is common to the distribution cable and the tether by a strength member positioned within the overmolded body and/or the overmolded body having a geometrical configuration that promotes bending along the common axis. The preferential bend reduces any path length differences between terminated optical fibers routed substantially on the common axis and optical fibers remaining within the distribution cable induced by bending, thereby preventing breakage of the terminated optical fibers.

Claims

1. A fiber optic distribution cable assembly, comprising:

a distribution cable comprising a plurality of optical fibers and having at least one predetermined mid-span access location positioned along the length of the distribution cable, at least one of the plurality of optical fibers accessed and terminated from the distribution cable at the mid-span access location;

a tether comprising a first end attached to the distribution cable at the mid-span access location and at least one optical fiber optically connected to the at least one optical fiber terminated from the distribution cable; and

an overmolded body comprising a flexible material encapsulating the distribution cable and a portion of the tether to form the mid-span access location;

wherein the overmolded mid-span access location is provided with a preferential bend.

2. The fiber optic distribution cable assembly of claim 1, wherein the preferential bend of the mid-span access location is along an axis that is common to the distribution cable and the tether and wherein the at least one optical fiber terminated from the distribution axis is routed into the tether substantially on the common axis.

3. The fiber optic distribution cable assembly of claim 1, wherein the preferential bend is provided by at least one strength member axially aligned with the distribution cable.

4. The fiber optic distribution cable assembly of claim 3, wherein the at least one strength member is positioned within the overmolded body.

5. The fiber optic distribution cable assembly of claim 3, wherein the at least one strength member causes the mid-span access location to bend along an axis that is common to the distribution cable and the tether and wherein the at least one optical fiber terminated from the distribution axis is routed into the tether substantially on the common axis.

6. The fiber optic distribution cable assembly of claim 3, wherein the at least one strength member is generally rod shaped and extends lengthwise along the mid-span access location.

7. The fiber optic distribution cable assembly of claim 3, wherein the at least one strength member is generally U-shaped and extends lengthwise along the mid-span access location.

8. The fiber optic distribution cable assembly of claim 3, wherein the strength member is generally I-shaped and extends lengthwise along the mid-span access location.

9. The fiber optic distribution cable assembly of claim 3, wherein the strength member is generally W-shaped and extends lengthwise along the mid-span access location.

10. The fiber optic distribution cable assembly of claim 1, wherein the overmolded body has a predetermined geometrical configuration for providing the preferential bend of the mid-span access location.

11. The fiber optic distribution cable assembly of claim 10, wherein the geometrical configuration of the overmolded body is generally cylindrical with D-cuts formed on opposing lateral sides of the overmolded body.

12. The fiber optic distribution cable assembly of claim 10, wherein the geometrical configuration of the overmolded body comprises a figure-eight shape.

13. The fiber optic distribution cable assembly of claim 10, wherein the geometrical configuration of the overmolded body comprises an accordion shape.

14. A fiber optic distribution cable assembly, comprising:

a distribution cable comprising a plurality of optical fibers and having at least one predetermined mid-span access location positioned along the length of the distribution cable, at least one of the plurality of optical fibers accessed and terminated from the distribution cable at the mid-span access location;

a tether comprising a first end attached to the distribution cable at the mid-span access location and at least one optical fiber optically connected to the at least one optical fiber terminated from the distribution cable; and

an overmolded body comprising a flexible material encapsulating the distribution cable and a portion of the tether to form the mid-span access location;

wherein the overmolded body has a predetermined geometrical configuration that provides the mid-span access location with a preferential bend along an axis that is common to the distribution cable and the tether.

15. The fiber optic distribution cable assembly of claim 14 wherein the at least one optical fiber terminated from the distribution cable is routed into the tether substantially on the common axis.

16. The fiber optic distribution cable assembly of claim 14, further comprising at least one strength member axially aligned with the distribution cable.

17. The fiber optic distribution cable assembly of claim 16, wherein the at least one strength member is positioned within the overmolded body.

18. A fiber optic distribution cable assembly, comprising:

a distribution cable comprising a plurality of optical fibers and at least one factory-prepared mid-span access location positioned along the length of the distribution cable, at least one of the plurality of optical fibers accessed and terminated from the distribution cable at the mid-span access location;

a tether comprising a first end attached to the distribution cable at the mid-span access location and at least one optical fiber optically connected to the optical fiber terminated from the distribution cable;

an overmolded body formed from a flexible material encapsulating the distribution cable and a portion of the tether to form the mid-span access location; and

means for providing the mid-span access location with a preferential bend along an axis that is common to the distribution cable and the tether.

19. A fiber optic distribution cable assembly according to claim 18, wherein the preferential bend reduces any path length difference between the optical fiber terminated from the distribution cable and an optical fiber remaining within the distribution cable induced by bending to thereby prevent breakage of the optical fiber terminated from the distribution cable.

20. A fiber optic distribution cable assembly according to claim 18, wherein the means for providing a preferential bend is selected from the group consisting of a strength member axially aligned with the distribution cable and a predetermined geometrical configuration of the overmolded body.