Cable assembly having bend performance optical fiber slack coil

• US 7,391,950 B2
• Filed: 11/13/2006
• Issued: 06/24/2008
• Est. Priority Date: 11/13/2006
• Status: Active Grant

• Current Assignee: Corning Optical Communications LLC (Corning Incorporated)
• Original Assignee: Corning Cable Systems LLC (Corning Incorporated)
• Inventors: Luther, James P., Lewallen, Christopher Paul, Makrides-Saravanos, Elli, Saravanos, Costas, Elkins, Robert B. III
• Primary Examiner(s): Pak; Sung
• Assistant Examiner(s): SMITH, CHAD
• Application Number:
  US11/598,513
• Publication Number:
  US 20080112675A1
• Time in Patent Office: 589 Days
• Field of Search: None
• US Class Current: 385/134
• CPC Class Codes: G02B 6/4454 with splices
• CPC Class Codes: G02B 6/4475 with provision for lateral branching G02B6/4431 takes precedence

Abstract

A fiber optic cable assembly including a mid-span access location, a cable having at least fiber therein, and a tether attached and spliced to at least one fiber of the cable. The access location and portions of the cables are substantially encapsulated within a flexible body having dimensions sufficient to accommodate a slack coil or loop of bend performance optical fiber therein. A method for making a fiber optic cable assembly including an access location, distribution cable, tether and slack coil of optical fiber maintained within a flexible overmolded body while providing an assembly having a cross-sectional diameter less than about 1.25 inches.

Claims

1. A fiber optic cable assembly, comprising:

a fiber optic cable including at least one cable optical fiber therein and at least one mid-span access location at which at least one pre-selected optical fiber is preterminated and through which at least one optical fiber extends without termination;

at least one tether attached at the mid-span access location and including at least one tether optical fiber therein that is spliced to the at least one preterminated optical fiber of the fiber optic cable;

a flexible body substantially encapsulating the at least one mid-span access location and providing space therein for maintaining a slack coil of spliced together portions of the at least one preterminated optical fiber and the at least one tether optical fiber;

a tube for maintaining the slack coil of optical fiber within the tube, wherein the tube is radially spaced apart from the at least one optical fiber extending without termination through the mid-span access location; and

wherein at least one of the preterminated optical fiber and the tether optical fiber comprise bend performance optical fiber.

2. The cable assembly of claim 1, wherein the flexible body is an overmolded body.

3. The cable assembly of claim 1, wherein the bend performance optical fiber is a microstructured optical fiber.

4. The cable assembly of claim 1, wherein the cable assembly has a cross-sectional diameter less than about 1.25 inches.

5. The cable assembly of claim 1, wherein the tube is at least partially filled with a lubricant.

6. The cable assembly of claim 1, wherein at least a portion of the tether is secured by the flexible body.

7. The cable assembly of claim 1, further comprising a splitter operable for splitting the at least one preterminated optical fiber into at least one optical fiber that is optically connected to the at least one tether optical fiber, and at least one optical fiber that is optically connected to a downstream portion of the at least one cable optical fiber.

8. The cable assembly of claim 1, wherein the fiber optic cable includes at least one buffer tube.

9. The cable assembly of claim 1, wherein the slack coil has a short axis diameter less than 20 mm.

10. The cable assembly of claim 1, wherein the flexible body does not include a preferential bend element.

11. The cable assembly of claim 1, wherein the slack coil is a 180 degree loop.

12. A fiber optic cable assembly, comprising:

a fiber optic distribution cable including a plurality of optical fibers therein and including an access location wherein at least one optical fiber of the distribution cable is terminated and routed away from uncut optical fibers of the distribution cable and wherein at least one optical fiber of the distribution cable extends without termination through the access location;

a tether including at least one optical fiber therein, wherein the at least one optical fiber of the tether is spliced to the at least one terminated optical fiber of the distribution cable at a splice interface, and wherein a slack coil is formed about the splice interface;

a tube for maintaining the slack coil of optical fiber within the tube, wherein the tube is radially spaced apart from the at least one optical fiber extending through the access location without termination; and

a flexible body substantially encapsulating the access location, a portion of the tether, the slack coil, the tube and the splice interface.

13. The cable assembly of claim 12, wherein the tube is at least partially filled with a lubricant.

14. The cable assembly of claim 12, wherein at least one of the plurality of optical fibers of the distribution cable and the at least one optical fiber of the tether are bend performance optical fiber.

15. The cable assembly of claim 14, wherein the bend performance optical fiber is a microstructured optical fiber.

16. The cable assembly of claim 12, further comprising an optical splitter operable for splitting the at least one terminated optical fiber into at least one optical fiber optically connected to the at least one tether optical fiber, and at least one optical fiber that is optically connected to a downstream portion of the at least one terminated optical fiber.

17. The cable assembly of claim 12, wherein the flexible body has a cross-sectional diameter less than about 1.25 inches.

18. The cable assembly of claim 12, wherein the flexible body defines a space within dimensioned large enough to accommodate a minimum bend radius of the slack coil of bend performance optical fiber.

19. A method for making a fiber optic cable assembly having an access location, fiber optic cable and a tether attached thereto, wherein at least one optical fiber of the cable is spliced to at least one optical fiber of the tether, the method comprising:

preterminating at least one optical fiber of the fiber optic cable at an access location through which at least one oDtical fiber extends without termination;

splicing together the at least one preterminated optical fiber with the at least one optical fiber of the tether;

forming a slack coil about a splice interface of the at least one preterminated optical fiber and the at least one optical fiber of the tether wherein the slack coil is maintained within a tube radially spaced apart from the at least one optical fiber extending without termination through the access location; and

maintaining the slack coil and at least a portion of the access location and tether within a flexible body dimensioned large enough to accommodate a minimum bend radius of the slack coil therein.

20. The method of claim 19, further comprising splitting the at least one preterminated optical fiber of the fiber optic cable into a first optical fiber that is spliced to the at least one optical fiber of the tether and a second optical fiber that is spliced to a downstream portion of the at least one preterminated optical fiber of the fiber optic cable.

21. The method of claim 19, wherein at least one of the preterminated optical fiber of the fiber optic cable and the at least one optical fiber of the tether are bend performance optical fiber.

22. The method of claim 21, wherein the bend performance optical fiber is microstructured optical fiber.

23. The method of claim 19, wherein the slack coil is a 180 degree loop.