Fiber optic cable assembly for installation on a powerline conductor
The disclosed fiber optic cable may include (1) a plurality of optical fibers, (2) a core tube surrounding the plurality of optical fibers, (3) a thixotropic gel filling an interstitial space among the optical fibers within the core tube, (4) an intermediate layer surrounding the core tube, where the intermediate layer includes a plurality of linear elements contra-helically wrapped about the core tube, and (5) an outer layer surrounding the intermediate layer, where the outer layer includes a combination of a moisture-cure cross-linked material and an activation catalyst, where the outer layer is formed by masticating and extruding the combination onto the intermediate layer. Various other cables, assemblies, and methods are also disclosed.
1. A fiber optic cable comprising:
a plurality of optical fibers;
a core tube surrounding the plurality of optical fibers;
a thixotropic gel filling an interstitial space among the plurality of optical fibers within the core tube, wherein the thixotropic gel increases a hoop strength applicable to the core tube;
an intermediate layer surrounding the core tube, wherein the intermediate layer comprises a plurality of linear elements wrapped about the core tube to provide a predetermined tensile strength to the fiber optic cable without overcoming the hoop strength of the core tube; and
an outer layer surrounding the intermediate layer, wherein the outer layer comprises a combination of a moisture-cure cross-linked material and an activation catalyst masticated and extruded onto the intermediate layer.
2. The fiber optic cable of claim 1 , wherein the plurality of optical fibers comprises a plurality of single-mode optical fibers.
3. The fiber optic cable of claim 1 , wherein the plurality of optical fibers comprise a plurality of multi-mode optical fibers.
4. The fiber optic cable of claim 1 , wherein the core tube comprises a dual-layer core tube.
5. The fiber optic cable of claim 1 , wherein the plurality of linear elements are impregnated with a swellable polymer.
6. The fiber optic cable of claim 1 , further comprising a plurality of swellable fibers that are aligned parallel to each other and adjacent the plurality of linear elements.
7. The fiber optic cable of claim 1 , wherein the plurality of linear elements are contra-helically wrapped about the core tube.
8. The fiber optic cable of claim 1 , wherein the plurality of linear elements comprise at least one of: a plurality of polymer fibers; or a plurality of fiberglass fibers.
9. The fiber optic cable of claim 1 , wherein the outer layer further comprises a chemical animal repellant.
10. A method of assembling a fiber optic cable, comprising:
disposing a plurality of optical fibers within a core tube;
filling an interstitial space among the plurality of optical fibers within the core tube with a thixotropic gel, wherein the thixotropic gel increases a hoop strength applicable to the core tube;
surrounding the core tube with an intermediate layer by wrapping a plurality of linear elements about the core tube to provide a predetermined tensile strength to the fiber optic cable without overcoming the hoop strength of the core tube; and
surrounding the intermediate layer with an outer layer, comprising masticating and extruding a combination of a moisture-cure cross-linked material and an activation catalyst onto the intermediate layer.
11. The method of claim 10 , wherein wrapping the plurality of linear elements about the core tube comprises contra-helically wrapping the plurality of linear elements about the core tube.
12. The method of claim 10 , further comprising:
applying a wax to the outer layer;
winding the fiber optic cable into a circular bundle;
reshaping the circular bundle into a noncircular bundle; and
heating the noncircular bundle to reflow the wax.