Flat drop cable with features for enhancing stripability
View Patent ↗A flat drop cable has notches or other structures for enhancing the stripability of the jacket from the a core of the flat drop cable. The notches can have an angled configuration with surfaces that converge as the notch extends into the jacket. Inner edges of the notches can be positioned along a tear path that intersects the core of the flat drop cable. For example, the notches can be offset from a minor axis of the flat drop cable a sufficient distance such that the notches are positioned outside a central boundary region that extends tangent to sides of the core and parallel to the minor axis of the flat drop cable.
1. A fiber optic cable having a central longitudinal axis, the fiber optic cable comprising:
a jacket having a length that extends along the central longitudinal axis of the fiber optic cable, the jacket defining a transverse cross-sectional profile having a thickness and a width, the width extending between opposite rounded ends, the thickness being smaller than the width, the transverse cross- sectional profile of the jacket defining a major axis that extends across the width of the jacket and a minor axis that extends across the thickness of the jacket, the major and minor axes being perpendicular to one another and also being perpendicular to the central longitudinal axis of the fiber optic cable, and the major axis and the minor axis intersecting each other at the central longitudinal axis;
a core positioned within the jacket that extends along the central longitudinal axis, the core including at least one optical fiber;
strength members positioned within the jacket at opposite ends of the core, the strength members having a cross-dimension that extends along a majority of the thickness of the jacket;
a first open-sided notch defined by the jacket that extends along the length of the jacket, the first open-sided notch being positioned at a location offset from the minor axis the first notch being defined by first and second surfaces that are angled relative to each other and that converge as the surfaces extend into the jacket, the first surface extending towards the minor axis and the second surface extending away from the minor axis as they converge; and
a second open-sided notch defined by the jacket that extends along the length of the jacket, the second open-sided notch being positioned at a location offset from the minor axis.
2. The fiber optic cable of claim 1 , wherein the surfaces meet at an edge.
3. The fiber optic cable of claim 1 , wherein each open-sided notch is provided outside of a boundary defined by first and second lines that are tangent to the core and that are perpendicular to the major axis.
4. The fiber optic cable of claim 1 , wherein the first and second open-sided notches are arranged so as to both be intersected by a reference plane that is perpendicular to the major axis.
5. The fiber optic cable of claim 4 , wherein the first and second open-sided notches have closed sides that define edges, and wherein the edges are aligned with the reference plane that is perpendicular to the major axis.
6. The fiber optic cable of claim 1 , wherein the first and second open-sided notches are arranged so as to both be intersected by a diagonal reference plane that intersects the core.
7. The fiber optic cable of claim 6 , wherein the first and second open-sided notches have closed sides that define edges, and wherein the edges are aligned with the diagonal reference plane.
8. The fiber optic cable of claim 7 , wherein the diagonal reference plane intersects the optical fiber.
9. The fiber optic cable of claim 6 , wherein the jacket defines first and second sides separated by the thickness, wherein the first open-sided notch is defined at the first side of the jacket between the minor axis and the first rounded end of the jacket, wherein the second open-sided notch is defined at the second side of the jacket between the minor axis and the second rounded end, wherein a notch is not provided at the first side of the jacket between the minor axis and the second rounded end of the jacket, and wherein a notch is not provided at the second side of the jacket between the minor axis and the first rounded end of the jacket.
10. The fiber optic cable of claim 1 , wherein the jacket is tightly extruded about the core.
11. The fiber optic cable of claim 1 , wherein the strength members include water swellable material.
12. A fiber optic cable having a central longitudinal axis, the fiber optic cable comprising:
a jacket having a length that extends along the central longitudinal axis of the fiber optic cable, the jacket defining a transverse cross-sectional profile having a thickness and a width, the thickness being smaller than the width, the transverse cross-sectional profile of the jacket defining a major axis that extends across the width of the jacket and a minor axis that extends across the thickness of the jacket, the major and minor axes being perpendicular to one another and also being perpendicular to the central longitudinal axis of the fiber optic cable, the major axis and the minor axis intersecting each other at the central longitudinal axis, the jacket defining first and second sides separated by the thickness and first and second rounded ends separated by the width;
a core positioned within the jacket that extends along the central longitudinal axis, the core including at least one optical fiber;
strength members positioned within the jacket at opposite ends of the core, the strength members having a cross-dimension that extends along a majority of the thickness of the jacket; and
a first weakened region that extends into the jacket from the first side of the jacket at a location between the minor axis and the first rounded end of the jacket and a second weakened region that extends into the jacket from the second side of the jacket at a location between the minor axis and the second rounded end of the jacket, the first and second weakened regions including inner portions positioned along a diagonal reference plane that intersects the core, the inner portions of each weakened region including a first surface that extends along the diagonal reference plane towards the minor axis as the respective weakened region extends into the jacket, the first and second weakened regions also each including a second surface that extends at a second diagonal away from the minor axis as the respective weakened region extends into the jacket.
13. The fiber optic cable of claim 12 , wherein the diagonal reference plane intersects the optical fiber.
14. The fiber optic cable of claim 13 , wherein the diagonal reference plane defines a tear path along which the jacket can be stripped from the core.
15. The fiber optic cable of claim 12 , wherein the first and second weakened regions include open-sided notches.
16. The fiber optic cable of claim 12 , wherein the first and second surfaces intersect at inner edges that form the inner portions of the first and second weakened regions.
17. The fiber optic cable of claim 12 , wherein a weakened region is not provided at the first side of the jacket between the minor axis and the second rounded end of the jacket, and wherein a weakened region is not provided at the second side of the jacket between the minor axis and the first rounded end of the jacket.
18. The fiber optic cable of claim 12 , wherein each weakened region is provided outside of a boundary defined by first and second lines that are tangent to the core and that are perpendicular to the major axis.
19. The fiber optic cable of claim 12 , wherein the jacket is tightly extruded about the core.
20. The fiber optic cable of claim 12 , wherein the core includes an optical fiber and a buffer layer that surrounds the optical fiber.