Binder film for a fiber optic cable
First Claim
1. A fiber optic cable, comprising:
- core elements stranded around a central strength member in a pattern of stranding including reversals in lay direction of the core elements, the core elements comprising;
a buffer tube surrounding optical fibers; and
one or more additional core elements, comprising at least one of;
a filler rod, andan additional buffer tube;
a binder film surrounding the stranded core elements,wherein the binder film is continuous peripherally around the core elements, forming a continuous closed loop when viewed in cross-section, and continuous lengthwise along a length of the cable that is at least 10 meters, wherein the binder film is 0.5 millimeters or less in thickness,wherein the binder film is in radial tension and opposes outwardly transverse deflection of the core elements, and wherein the binder film loads the core elements normally to the central strength member such that contact between the core elements and central strength member provides coupling therebetween, thereby limiting axial migration of the core elements relative to the central strength member; and
a jacket surrounding the binder film, wherein the jacket is at least five times thicker than the binder film.
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Accused Products
Abstract
A fiber optic cable includes a core and a binder film surrounding the core. The core includes a central strength member and core elements, such as buffer tubes containing optical fibers, where the core elements are stranded around the central strength member in a pattern of stranding including reversals in lay direction of the core elements. The binder film is in radial tension around the core such that the binder film opposes outwardly transverse deflection of the core elements. Further, the binder film loads the core elements normally to the central strength member such that contact between the core elements and central strength member provides coupling therebetween, limiting axial migration of the core elements relative to the central strength member.
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Citations
30 Claims
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1. A fiber optic cable, comprising:
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core elements stranded around a central strength member in a pattern of stranding including reversals in lay direction of the core elements, the core elements comprising; a buffer tube surrounding optical fibers; and one or more additional core elements, comprising at least one of; a filler rod, and an additional buffer tube; a binder film surrounding the stranded core elements, wherein the binder film is continuous peripherally around the core elements, forming a continuous closed loop when viewed in cross-section, and continuous lengthwise along a length of the cable that is at least 10 meters, wherein the binder film is 0.5 millimeters or less in thickness, wherein the binder film is in radial tension and opposes outwardly transverse deflection of the core elements, and wherein the binder film loads the core elements normally to the central strength member such that contact between the core elements and central strength member provides coupling therebetween, thereby limiting axial migration of the core elements relative to the central strength member; and a jacket surrounding the binder film, wherein the jacket is at least five times thicker than the binder film. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A fiber optic cable, comprising:
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a core of the cable comprising core elements comprising; a tube surrounding at least one optical fiber; and one or more additional core elements, comprising at least one of; a filler rod, and an additional tube; a binder film constraining the core such that the binder film is in tension around the core; and powder particles partially embedded in the binder film such that the powder particles have a portion thereof submerged in the binder film passing partly through a surface plane of the binder film and another portion thereof exposed partially projecting away from the surface plane of the binder film, wherein at least some of the powder particles are positioned on an inside surface of the binder film between the binder film and the core. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A fiber optic cable, comprising:
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core elements stranded around a central strength member in a pattern of stranding including reversals in lay direction of the core elements, the core elements comprising; a buffer tube surrounding optical fibers; and one or more additional core elements, comprising at least one of; a filler rod, and an additional buffer tube; a binder film formed around the core elements to at least partially constraining the core elements, wherein the binder film is continuous peripherally around the core elements and continuous lengthwise along a length of the cable that is at least 10 meters, and wherein coupling between the stranded core elements and the central strength member facilitated by radial tension in the binder film is such that a force to pull and move a 100 mm length of the central strength member through the stranded core elements is at least 5 newtons; and a jacket around the binder film, wherein the jacket is at least five times thicker than the binder film. - View Dependent Claims (22, 23, 24, 25)
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26. A fiber optic cable, comprising:
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core elements stranded around a central strength member in a pattern of stranding including reversals in lay direction of the core elements, the core elements comprising; a buffer tube surrounding optical fibers; and one or more additional core elements, comprising at least one of; a filler rod, and an additional buffer tube; a binder film surrounding the stranded core elements, wherein the binder film is continuous peripherally around the core elements, forming a continuous closed loop when viewed in cross-section, and continuous lengthwise along a length of the cable that is at least 10 meters, wherein the binder film is 0.5 millimeters or less in thickness, wherein the binder film is in radial tension and opposes outwardly transverse deflection of the core elements, and wherein the binder film loads the core elements normally to the central strength member such that contact between the core elements and central strength member provides coupling therebetween, thereby limiting axial migration of the core elements relative to the central strength member; armor surrounding the binder film; and a jacket surrounding the armor, wherein the jacket is at least five times thicker than the binder film. - View Dependent Claims (27, 28, 29, 30)
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Specification