Optical cable

Patent metadata

Field	Value
Publication number	US-10061096-B2
Application number	US-201415116889-A
Country	US
Kind code	B2
Filing date	Oct 3, 2014
Priority date	Mar 6, 2014
Publication date	Aug 28, 2018
Grant date	Aug 28, 2018

Abstract

[Solution] An optical cable of the present invention includes: an optical fiber unit including optical fibers; a sheath, having a circular external form, configured to house the optical fiber unit in a housing portion; and two strength members embedded in the sheath; and two rip cords, wherein when a direction of connecting the two strength members sandwiching the housing portion is a first direction and a direction intersecting the first direction is a second direction, in a cross section of the optical cable, a cross-sectional shape of the housing portion has a dimension in the second direction greater than that in the first direction, and the two rip cords is disposed to sandwich the optical fiber unit such that a direction of connecting the two rip cords is in the second direction, in the cross section of the optical cable.

First claim

The invention claimed is:

1. An optical cable comprising:
an optical fiber unit including a plurality of optical fibers;
a sheath configured to house the optical fiber unit in a housing portion, the sheath having a circular external form;
a pair of strength members embedded in the sheath sandwiching the housing portion, each strength member constituting said pair of strength members including at least one strength member; and
two rip cords, wherein
when a direction of connecting the pair of strength members sandwiching the housing portion is a first direction, and a direction intersecting the first direction is a second direction, in any cross section of the optical cable in a longitudinal direction,
a cross-sectional shape of the housing portion has a dimension in the second direction greater than a dimension in the first direction,
the two rip cords are disposed to sandwich the optical fiber unit such that a direction of connecting the two rip cords is in the second direction, in any cross section of the optical cable in the longitudinal direction,
the plurality of optical fibers are twisted in an SZ manner,
the cross-sectional shape of the housing portion is an elliptical shape with a minor axis and a major axis, and
L 1 /L 2 is equal to or greater than 0.55, where L 1 is the length of the minor axis and L 2 is the length of the major axis.

2. An optical cable comprising:
an optical unit including a plurality of optical fibers;
a sheath configured to house the optical fiber unit in a housing portion, the sheath having a circular external form;
a pair of strength members embedded in the sheath sandwiching the housing portion, each strength member constituting said pair of strength members including at least one strength member; and
two rip cords, wherein
when a direction of connecting the pair of strength members sandwiching the housing portion in a first direction, and a direction intersecting the first direction is a second direction, in any cross section of the optical cable in a longitudinal direction,
a cross-sectional shape of the housing portion has a dimension in the second direction greater than a dimension in the first direction,
the two rip cords are disposed to sandwich the optical fiber unit such that a direction of connecting the two rip cords is in the second direction, in any cross section of the optical cable in the longitudinal direction,
the cross-sectional shape of the housing portion is in such a shape as to be enclosed by two straight portions along the second direction and two arc-shaped portions on both sides in the second direction of the straight portions,
the plurality of optical fibers are twisted in an SZ manner, and
L 1 /L 2 is equal to or greater than 0.60,
where L 1 is a dimension of the housing portion in the first direction and L 2 is a dimension thereof in the second direction.

3. An optical cable comprising:
an optical fiber unit including a plurality of optical fibers;
a sheath configured to house the optical fiber unit in a housing portion, the sheath having a circular external form;
a pair of strength members embedded in the sheath sandwiching the housing portion, each strength member constituting said pair of strength members including at least one strength member; and
two rip cords, wherein
when a direction of connecting the pair of strength members sandwiching the housing portion in a first direction, and a direction intersecting the first direction is a second direction, in any cross section of the optical cable in a longitudinal direction,
a cross-sectional shape of the housing portion has a dimension in the second direction greater than a dimension in the first direction,
the two rip cords are disposed to sandwich the optical fiber unit such that a direction of connecting the two rip cords is in the second direction, in any cross section of the optical cable in the longitudinal direction,
the cross-sectional shape of the housing portion is in such a shape as to be narrowed at a line connecting the two strength members,
the plurality of optical fibers are twisted in an SZ manner, and
L 1 /L 2 is equal to or greater than 0.75,
where L 1 is a dimension of the housing portion in the first direction and L 2 is a dimension thereof in the second direction.

4. The optical cable according to claim 3 , wherein the strength members are made of a nonmetallic material,
and the cross-sectional shape of the housing portion is in such a shape as to be enclosed by two straight portions along the second direction and two arc-shaped portions on both sides in the second direction of the straight portions.

Assignees

• Fujikura Ltd

Inventors

• Takeda Daiki
• Kaji Tomoaki
• Shiobara Satoru
• Yamanaka Masayoshi
• Okada Naoki

Classifications

• G02B6/449

  Twisting · CPC title

• G02B6/4433 Primary

  Double reinforcement laying in straight line with optical transmission element · CPC title

• G02B6/566 Primary

  Devices for opening or removing the mantle · CPC title