Optical fiber cable
AssigneeFujikura Ltd.
InventorsShogo Shimizu, Akira Namazue, Ken Osato
Life of this patent
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Abstract
An optical fiber cable includes: a sheath; a core that is housed in the sheath and comprises optical fibers; tensile strength members embedded in the sheath; and ripcords embedded in the sheath. Recesses and protrusions are disposed alternately in a circumferential direction on an outer circumferential surface of the sheath. The recesses each include: two connecting portions respectively connected to radial inner ends of two adjacent protrusions; and a bottom surface positioned between the two connecting portions. In a transverse cross-sectional view, the ripcords are positioned inside some of the protrusions, and the tensile strength members are positioned inside the remaining protrusions.
Claims20
An optical fiber cable comprising:
- a sheath;
- a plurality of tensile strength members embedded in the sheath;
- and
- a core that is housed in the sheath and comprises an intermittently-adhered optical fiber ribbon comprising:
- optical fibers;
- and
- adhesive portions that intermittently adhere the optical fibers together in a longitudinal direction,
- wherein recesses and protrusions are disposed alternately in a circumferential direction on an outer circumferential surface of the sheath and extend an entire length of the sheath along the longitudinal direction, wherein inner surfaces of the recesses are curved surfaces that are radially inwardly convex.
An optical fiber cable comprising:
- a sheath;
- a plurality of tensile strength members embedded in the sheath;
- and
- a core that is housed in the sheath and comprises an intermittently-adhered optical fiber ribbon comprising:
- optical fibers;
- and
- adhesive portions that intermittently adhere the optical fibers together in a longitudinal direction,
- wherein recesses and protrusions are disposed alternately in a circumferential direction on an outer circumferential surface of the sheath and extend an entire length of the sheath along the longitudinal direction, wherein inner surfaces of the recesses are curved surfaces that are radially inwardly convex,
- wherein the number of protrusions does not match the number of tensile strength members, and
- wherein, in a transverse cross-sectional view, a cross-sectional area of the recesses that is enclosed by closed curves tangent to radial outer ends of the protrusions and all the recesses is 1.3 mm2 or greater and 4.8 mm2 or less.
Dependencies are inferred from the claim text.