Flat drop cable with center strength member
View Patent ↗The present disclosure relates to a fiber optic cable including an outer jacket having an elongated transverse cross-sectional profile defining a major axis and a minor axis. The transverse cross-sectional profile has a maximum width that extends along the major axis and a maximum thickness that extends along the minor axis. The maximum width of the transverse cross-sectional profile is longer than the maximum thickness of the transverse cross-sectional profile. The outer jacket also defines first, second and third separate passages that extend through the outer jacket along a lengthwise axis of the outer jacket. The third passage has a transverse cross-sectional profile that is elongated in an orientation extending along the major axis of the outer jacket. The first, second and third passages are generally aligned along the major axis with the third passage being positioned between the first and second passages. The fiber optic cable also includes a plurality of optical fibers positioned within each of the first and second passages and a tensile strength member positioned within the third passage. The tensile strength member has a transverse cross-sectional profile that is elongated in the orientation extending along the major axis.
1. A fiber optic cable comprising:
an outer jacket having an elongated transverse cross-sectional profile defining a major axis and a minor axis, the transverse cross-sectional profile having a maximum width that extends along the major axis and a maximum thickness that extends along the minor axis, the maximum width of the transverse cross-sectional profile being longer than the maximum thickness of the transverse cross-sectional profile, the outer jacket also defining first, second and third separate passages that extend through the outer jacket along a lengthwise axis of the outer jacket, the third passage having a transverse cross-sectional profile that is elongated in an orientation extending along the major axis of the outer jacket and a cross-sectional thickness along the minor axis of the outer jacket that is less than a maximum width of each of the first and second passages, the first, second and third passages being generally aligned along the major axis with the third passage being positioned between the first and second passages;
a plurality of optical fibers positioned within each of the first and second passages; and
a tensile strength member positioned within the third passage, the tensile strength member having a transverse cross-sectional profile that is elongated in the orientation extending along the major axis.
2. A fiber optic cable comprising:
an outer jacket having an elongated transverse cross-sectional profile defining a major axis and a minor axis, the transverse cross-sectional profile having a maximum width that extends along the major axis and a maximum thickness that extends along the minor axis, the maximum width of the transverse cross-sectional profile being longer than the maximum thickness of the transverse cross-sectional profile, the outer jacket also defining first, second and third separate passages that extend through the outer jacket along a lengthwise axis of the outer jacket, the third passage having a transverse cross-sectional profile that is elongated in an orientation extending along the major axis of the outer jacket, the first, second and third passages being generally aligned along the major axis with the third passage being positioned between the first and second passages;
a plurality of optical fibers positioned within each of the first and second passages; and
a tensile strength member positioned within the third passage, the tensile strength member having a transverse cross-sectional profile that is elongated in the orientation extending along the major axis, and wherein the tensile strength member is sufficiently flexible to be wrapped generally in a circle having a 10 millimeter inner diameter for one hour without undergoing meaningful deterioration in tensile strength.
3. The fiber optic cable of claim 1 , wherein the first and second passages have generally round transverse cross-sectional profiles.
4. The fiber optic cable of claim 1 , wherein the first and second passages are not lined with a buffer tube.
5. The fiber optic cable of claim 1 , wherein the strength member is bonded to the outer jacket.
6. The fiber optic cable of claim 5 , wherein the strength member is bonded to the outer jacket with an adhesive material.
7. The fiber optic cable of claim 6 , wherein the adhesive material includes ethylene acetate.
8. The fiber optic cable of claim 1 , wherein the optical fibers include bend insensitive optical fibers.
9. A fiber optic cable comprising:
an outer jacket having an elongated transverse cross-sectional profile defining a major axis and a minor axis, the transverse cross-sectional profile having a maximum width that extends along the major axis and a maximum thickness that extends along the minor axis, the maximum width of the transverse cross-sectional profile being longer than the maximum thickness of the transverse cross-sectional profile, the outer jacket also defining first, second and third separate passages that extend through the outer jacket along a lengthwise axis of the outer jacket, the third passage having a transverse cross-sectional profile that is elongated in an orientation extending along the major axis of the outer jacket, the first, second and third passages being generally aligned along the major axis with the third passage being positioned between the first and second passages;
a plurality of optical fibers positioned within each of the first and second passages; and
a tensile strength member positioned within the third passage, the tensile strength member having a transverse cross-sectional profile that is elongated in the orientation extending along the major axis, and wherein the tensile strength member does not provide meaningful compressive reinforcement to the outer jacket in an orientation that extends along the lengthwise axis.
10. The fiber optic cable of claim 1 , wherein the tensile strength member can carry a tensile load of at least 300 pounds.
11. A fiber optic cable comprising:
an outer jacket having an elongated transverse cross-sectional profile defining a major axis and a minor axis, the transverse cross-sectional profile having a maximum width that extends along the major axis and a maximum thickness that extends along the minor axis, the maximum width of the transverse cross-sectional profile being longer than the maximum thickness of the transverse cross-sectional profile, the outer jacket also defining first, second and third separate passages that extend through the outer jacket along a lengthwise axis of the outer jacket, the third passage having a transverse cross-sectional profile that is elongated in an orientation extending along the major axis of the outer jacket, the first, second and third passages being generally aligned along the major axis with the third passage being positioned between the first and second passages;
a plurality of optical fibers positioned within each of the first and second passages; and
a tensile strength member positioned within the third passage, the tensile strength member having a transverse cross-sectional profile that is elongated in the orientation extending along the major axis, and wherein the tensile strength member retains at least 95 percent of its pre-wrapped tensile strength after having been wrapped in a circle having a 10 millimeter inner diameter for one hour.
12. A fiber optic cable comprising:
an outer jacket having an elongated transverse cross-sectional profile defining a major axis and a minor axis, the transverse cross-sectional profile having a maximum width that extends along the major axis and a maximum thickness that extends along the minor axis, the maximum width of the transverse cross-sectional profile being longer than the maximum thickness of the transverse cross-sectional profile, the outer jacket also defining first, second and third separate passages that extend through the outer jacket along a lengthwise axis of the outer jacket, the third passage having a transverse cross-sectional profile that is elongated in an orientation extending along the major axis of the outer jacket, the first, second and third passages being generally aligned along the major axis with the third passage being positioned between the first and second passages;
a plurality of optical fibers positioned within each of the first and second passages; and
a tensile strength member positioned within the third passage, the tensile strength member having a transverse cross-sectional profile that is elongated in the orientation extending along the major axis, and wherein the tensile strength member can carry a tensile load of at least 150 pounds, and wherein the tensile strength member retains at least 95 percent of its pre-wrapped tensile strength after having been wrapped in a circle having a 10 millimeter inner diameter for one hour.
13. The fiber optic cable of claim 1 , wherein the outer jacket includes a polymeric base material and a shrinkage reduction material disposed within the polymeric base material.
14. The fiber optic cable of claim 13 , wherein the shrinkage reduction material includes a liquid crystal polymer.
15. The fiber optic cable of claim 1 , wherein the first and second passages each have a circular transverse cross-sectional profile, wherein the first and second passages are not lined with buffer tubes, wherein the tensile strength member is bonded to the outer jacket, and wherein the outer jacket includes a polymeric base material and a liquid crystal polymer disposed within the base material.
16. A fiber optic cable comprising:
an outer jacket having an elongated transverse cross-sectional profile defining a major axis and a minor axis, the transverse cross-sectional profile having a maximum width that extends along the major axis and a maximum thickness that extends along the minor axis, the maximum width of the transverse cross-sectional profile being longer than the maximum thickness of the transverse cross-sectional profile, the outer jacket also defining first, second and third separate passages that extend through the outer jacket along a lengthwise axis of the outer jacket, the third passage having a transverse cross-sectional profile that is elongated in an orientation extending along the major axis of the outer jacket, the first, second and third passages being generally aligned along the major axis with the third passage being positioned between the first and second passages;
a plurality of optical fibers positioned within each of the first and second passages; and
a tensile strength member positioned within the third passage, the tensile strength member having a transverse cross-sectional profile that is elongated in the orientation extending along the major axis, and wherein when the outer jacket is viewed in transverse cross-section, the outer jacket has a first and second portions in which the first and second passages are respectively defined and a third portion in which the third passage is defined, wherein the third portion is between the first and second portions, wherein the first and second portions define a first thickness and the third portion defines a second thickness, wherein the second thickness is the maximum thickness of the outer jacket, and wherein the second thickness is thicker than the first thickness.
17. The fiber optic cable of claim 16 , wherein the first thickness coincides with centers of the first and second passages and the second thickness coincides with a center of the third passage.