OPTICAL FIBER CABLE WITH REINFORCEMENT

• US 20150110451A1
• Filed: 06/27/2014
• Published: 04/23/2015
• Est. Priority Date: 10/18/2013
• Status: Active Grant

• Current Assignee: Corning Optical Communications LLC (Corning Incorporated)
• Original Assignee: Corning Optical Communications LLC (Corning Incorporated)
• Inventors: Blazer, Bradley Jerome, Gimblet, Michael John, Greenwood, Julian Latelle III, Lail, Jason Clay, McAlpine, Warren Welborn, Mozdy, Eric John
• Granted Patent: US 9,594,226 B2
• Time in Patent Office: Days
• US Class Current: 385/103
• CPC Class Codes: G02B 6/4403 with ribbon structure G02B6/4429, G02B6/4439, G02B6/4479 take precedence
• CPC Class Codes: G02B 6/441 built up from sub-bundles G02B6/4429, G02B6/4439, G02B6/4479 take precedence
• CPC Class Codes: G02B 6/4413 Helical structure
• CPC Class Codes: G02B 6/443 Protective covering
• CPC Class Codes: G02B 6/4431 with provision in the protective covering, e.g. weak line, for gaining access to one or more fibres, e.g. for branching or tapping break-out terminations G02B6/4471
• CPC Class Codes: G02B 6/4432 with fibre reinforcements
• CPC Class Codes: G02B 6/4434 Central member to take up tensile loads
• CPC Class Codes: G02B 6/4435 Corrugated mantle

Abstract

An optical communication cable includes a cable body, a plurality of core elements located within the cable body, a reinforcement layer surrounding the plurality of core elements within the cable body, and a film surrounding the plurality of core elements. At least one of the plurality of core elements includes an elongate optical transmission element. The film provides an inwardly directed force onto the core elements, and a surface of the film is bonded to the reinforcement layer.

Claims

1. An optical communication cable comprising:

a cable body formed from a first material;

a plurality of core elements located within the cable body, wherein at least one of the core elements includes an elongate optical transmission element;

a reinforcement layer surrounding the plurality of core elements within the cable body; and

a film formed from a second material surrounding the plurality of core elements, wherein the film provides an inwardly directed force onto the core elements, and further wherein a surface of the film is bonded to the reinforcement layer.

2. The optical communication cable of claim 1 wherein the film is bonded to the reinforcement layer such that the film remains attached to the reinforcement layer upon opening of the reinforcement layer to access the plurality of core elements.

3. The optical communication cable of claim 1 wherein the film is located between the plurality of core elements and the reinforcement layer, wherein an inner surface of the cable body is bonded to an outer surface of the reinforcement layer and an outer surface of the film is bonded to an inner surface of the reinforcement layer such that reinforcement layer remains attached to both the film and the cable body upon opening of the cable body to access the core elements.

4. The optical communication cable of claim 3 further comprising an elongate member embedded within the first material of the cable body, wherein the elongate member facilitates opening of the cable body, wherein the reinforcement layer comprises a first lateral edge and a second lateral edge, wherein the first lateral edge overlaps the second lateral edge creating an overlap portion, wherein the elongate member is radially aligned with the overlap portion.

5. The optical communication cable of claim 1 wherein the film is bonded to the reinforcement layer via a bonding agent.

6. The optical communication cable of claim 1 wherein the film is bonded to the reinforcement layer via melting of the material of the film.

7. The optical communication cable of claim 1 further comprising a central strength member located within the cable body, wherein the plurality of core elements are wrapped around the central strength member in a spiral pattern, wherein the inwardly directed force provided by the film holds the core elements in the spiral pattern.

8. The optical communication cable of claim 7 wherein the film is an elastic sleeve having an inner surface that is in contact with at least a portion of an outer surface of at least some of the plurality of core elements.

9. The optical communication cable of claim 1 wherein the first material is different than the second material and the reinforcement layer includes a corrugated metal sheet wrapped around the film and the plurality of core elements.

10. The optical communication cable of claim 1 wherein the reinforcement layer is a multi-piece reinforcement layer comprising:

a first reinforcement sheet located within the cable body and extending a portion of the distance around the plurality of core elements, the first reinforcement sheet having a first lateral edge and an opposing second lateral edge; and

a second reinforcement sheet located within the cable body and extending a portion of the distance around the plurality of core elements, the second reinforcement sheet having a first lateral edge and an opposing second lateral edge;

wherein the first lateral edge of the first reinforcement sheet is adjacent the first lateral edge of the second reinforcement sheet and the second lateral edge of the first reinforcement sheet is adjacent the second lateral edge of the second reinforcement sheet such that the combination of the first reinforcement sheet and the second reinforcement sheet surround the plurality of core elements, wherein the first lateral edge of the first reinforcement sheet is coupled to the first lateral edge of the second reinforcement sheet and the second lateral edge of the first reinforcement sheet is coupled to the second lateral edge of the second reinforcement sheet.

11. An optical communication cable comprising:

an extruded cable body including an inner surface defining a passage in the cable body, the cable body formed from a first material;

an elongate central strength member located within the passage;

a plurality of core elements located within the passage and positioned around the central strength member, wherein at least one of the core elements includes an elongate optical transmission element;

an elastic sleeve surrounding the central strength member and surrounding the plurality of core elements, wherein at least a portion of an inner surface of the elastic sleeve is in direct contact with a portion of the outer surfaces of at least some of the plurality of core elements; and

a reinforcement material located within the passage and located outside of and wrapped around the elastic sleeve, wherein an inner surface of the reinforcement material is bonded to an outer surface of the elastic sleeve such that both the elastic sleeve and the reinforcement material are openable via the same opening action.

12. The optical communication cable of claim 11 wherein the elastic sleeve provides an interference fit with the plurality of core elements such that the elastic sleeve provides an inwardly directed force onto the core elements.

13. The optical communication cable of claim 12 wherein the elastic sleeve is an extruded sleeve that provides the interference fit by contraction during cooling around the core elements following extrusion, wherein the extruded material of the elastic sleeve is different from the extruded material of the cable body.

14. The optical communication cable of claim 11 wherein the elastic sleeve is bonded to the reinforcement material by at least one of a bonding agent and via melting of the material of the elastic sleeve.

15. The optical communication cable of claim 11 wherein an inner surface of the cable body is bonded to an outer surface of the reinforcement layer such that reinforcement material remains attached to both the elastic sleeve and the cable body upon opening of the cable body to access the core elements.

16. The optical communication cable of claim 11 wherein at least one of the plurality of core elements comprises a buffer tube surrounding a plurality of optical fibers, wherein the inner surface of the elastic sleeve contacts an outer surface of the buffer tube.

17. An optical communication cable comprising:

a cable body formed from an extruded first material and including an inner surface defining a passage in the cable body;

an elongate central strength member located in the passage;

a plurality of elongate optical transmission elements located in the passage and wrapped around the elongate central strength member such that a portion of the length of the plurality of wrapped elongate optical transmission elements form a spiral pattern around the elongate central strength member;

a film formed from an extruded second material, the film located in the passage and surrounding the plurality of elongate optical transmission elements and providing an inwardly directed force on to the plurality of elongate optical transmission elements such that the film acts to maintain the spiral pattern of the elongate optical transmission elements; and

a reinforcement layer located in the passage and wrapped around the film, wherein an inner surface of the reinforcement layer is bonded to an outer surface of the film such that the reinforcement layer remains bound to the film upon opening of the cable body to expose the optical transmission elements within the cable.

18. The optical communication cable of claim 17 wherein the extruded first material is different than the extruded second material, wherein at least one of the plurality of optical transmission elements includes a buffer tube surrounding an optical fiber, wherein the spiral pattern is an S-Z stranding pattern.

19. The optical communication cable of claim 18 wherein an outer surface of the reinforcement layer is bonded to the inner surface of the cable body, wherein the inner surface of the reinforcement layer is bonded to the outer surface of the film by at least one of a bonding agent and via heating of the material of the film, wherein the outer surface of the reinforcement layer is bonded to the inner surface of the cable body by at least one of a bonding agent and via heating of the material of the cable body.

20. The optical communication cable of claim 19 wherein the extruded first material is a polyethylene material and the extruded second material is at least one of a polyethylene material and a polyester material, wherein the reinforcement layer is formed from a corrugated metal material.

21. An optical communication cable, comprising:

a cable body including an inner surface defining a passage in the cable body;

an elongate central strength member located in the passage;

a plurality of elongate optical transmission elements wrapped around the elongate central strength member such that a portion of the length of the plurality of wrapped elongate optical transmission elements forms a spiral portion around the elongate central strength member;

armor comprising metal, the armor wrapped around the plurality of optical transmission elements such that the armor surrounds the plurality of optical transmission elements,

wherein the armor applies a radial inwardly-directed force to outer surfaces of the plurality of elongate optical transmission elements such that the armor acts to maintain the arrangement of the spiral portion of the wrapped elongate optical transmission elements, whereby in addition to providing structural support, the armor serves as a constraining element or constraining sleeve to bind the plurality of elongate optical transmission elements.

22. The optical communication cable of claim 21 wherein the radial inwardly-directed force contributes to normal force between the plurality of elongate optical transmission elements and the elongate central strength member, whereby the arrangement of the armor limits relative movement between the plurality of elongate optical transmission elements and the elongate central strength member by way of frictional force.

23. The optical communication cable of claim 21 wherein the armor is arranged to have an interference fit with the outer surfaces of the plurality of elongate optical transmission elements, and wherein the optical communication cable includes no helically wrapped binder between the armor and the plurality of elongate optical transmission elements.

24. The optical communication cable of claim 21 wherein the armor is formed from a corrugated metal material, and wherein the corrugated metal material is steel.

25. The optical communication cable of claim 21, wherein the armor is a rolled single sheet or a helically wrapped tape.

26. The optical communication cable of claim 21, wherein an outer surface of the armor is bonded to the cable body.

27. The optical communication cable of claim 26, wherein the cable body is a jacket comprising at least one of polyethylene, polyvinyl chloride, and polyvinylidene difluoride, the jacket further comprising at least one of coloring materials, UV-light blocking materials, burn resistance materials, wherein the plurality of elongate optical transmission elements are wrapped in an S-Z stranding pattern, wherein at least one of the plurality of optical transmission elements includes a buffer tube surrounding an optical fiber, and wherein the armor is in direct contact with an outer surface of the buffer tube.

28. The optical communication cable of claim 21, further comprising water absorbent particles coupled to an inside surface of the armor and in direct contact with the outer surfaces of the plurality of elongate optical transmission elements.

29. The optical communication cable of claim 21, wherein the armor comprises:

a first segment wrapped a portion of the distance around the plurality of elongate optical transmission elements, the first segment having a first lateral edge and an opposing second lateral edge; and

a second segment wrapped a portion of the distance around the plurality of elongate optical transmission elements, the second segment having a first lateral edge and an opposing second lateral edge.

30. The optical communication cable of claim 29 further comprising:

a first elongate member embedded in the cable body, wherein the first elongate member is aligned with and located exterior to the first lateral edge of the first segment; and

a second elongate member embedded in the cable body, wherein the second elongate member is aligned with and located exterior to the second lateral edge of the first segment;

wherein the first and second elongate members facilitate opening of the cable body and of the armor to provide access to the plurality of optical transmission elements located within the passage.