Optical fiber ribbon
An optical fiber ribbon includes five or more optical fibers disposed in a disposition direction perpendicular to a longitudinal direction of the optical fiber ribbon and connection parts disposed intermittently in the longitudinal and disposition directions. Each of the connection parts is disposed between and connects adjacent ones of the optical fibers. The optical fiber ribbon has a first high-density region and a first low-density region disposed at different positions in the longitudinal direction and a second high-density region and a second low-density region disposed at different positions in the longitudinal direction. At least two of the connection parts having different positions from each other in the longitudinal and disposition directions are disposed in the first high-density region. At least another two of the connection parts having different positions from each other in the longitudinal and disposition directions are disposed in the second high-density region.
1 . An optical fiber ribbon comprising:
five or more optical fibers disposed in a disposition direction perpendicular to a longitudinal direction of the optical fiber ribbon; and
connection parts disposed intermittently in the longitudinal direction and the disposition direction, wherein each of the connection parts is disposed between and connects adjacent ones of the optical fibers, wherein
the optical fiber ribbon has:
first high-density regions and first low-density regions alternately disposed in the longitudinal direction; and
second high-density regions and second low-density regions alternately disposed in the longitudinal direction,
each of the first high-density regions includes at least two of the connection parts that have different positions from each other in the longitudinal direction and the disposition direction,
each of the second high-density regions includes at least another two of the connection parts that have different positions from each other in the longitudinal direction and the disposition direction,
a number density of the connection parts in each of the first low-density regions is lower than a number density of the connection parts in each of the first high-density regions,
a number density of the connection parts in each of the second low-density regions is lower than a number density of the connection parts in each of the second high-density regions,
a dimension in the longitudinal direction of a portion in which one of the first low-density regions and one of the second low-density regions overlap in the disposition direction is smaller than a dimension of the one of the first low-density regions in the longitudinal direction and a dimension of the one of the second low-density regions in the longitudinal direction,
none of the first low-density regions includes a connection part,
none of the second low-density regions includes a connection part,
the number density of the connection parts is constant among the first high-density regions, and
the number density of the connection parts is constant among the second high-density regions.
2 . The optical fiber ribbon according to claim 1 , wherein
the connection parts include:
first right end connection parts positioned on a rightmost side in each inter-fiber region between adjacent ones of the optical fibers in one of the first high-density regions;
first left end connection parts positioned on a leftmost side in each inter-fiber region between adjacent ones of the optical fibers in the one of the first high-density regions;
second right end connection parts positioned on a rightmost side in each inter-fiber region between adjacent ones of the optical fibers in one of the second high-density regions; and
second left end connection parts positioned on a leftmost side in each inter-fiber region between adjacent ones of the optical fibers in the one of the second high-density regions,
a first right straight line connects right ends of two of the first right end connection parts on a rightmost side in the one of the first high-density regions,
a first left straight line connects left ends of two of the first left end connection parts on a leftmost side in the one of the first high-density regions,
a second right straight line connects right ends of two of the second right end connection parts on a rightmost side in the one of the second high-density regions,
a second left straight line connects left ends of two of the second left end connection parts on a leftmost side in the one of the second high-density regions,
one of the connection parts that is in the one of the first high-density regions and that overlaps the first right straight line does not overlap the second right straight line,
one of the connection parts that is in the one of the first high-density regions and that overlaps the first left straight line does not overlap the second left straight line,
one of the connection parts that is in the one of the second high-density regions and that overlaps the second right straight line does not overlap the first right straight line, and
one of the connection parts that is in the one of the second high-density regions and that overlaps the second left straight line does not overlap the first left straight line.
3 . The optical fiber ribbon according to claim 1 , wherein the dimension in the longitudinal direction of a portion in which the one of the first low-density regions and the one of the second low-density regions overlap in the disposition direction is smaller than a dimension of one of the first high-density regions in the longitudinal direction and a dimension of one of the second high-density regions in the longitudinal direction.
4 . The optical fiber ribbon according to claim 1 , wherein
at least one of the connection parts is disposed in each inter-fiber region between adjacent ones of the optical fibers in one of the first high-density regions, and
at least one of the connection parts is disposed in each inter-fiber region between adjacent ones of the optical fibers in one of the second high-density regions.
5 . The optical fiber ribbon according to claim 1 , wherein
at least one of the connection parts is disposed on each of two opposite end edges of one of the first high-density regions in the longitudinal direction, and
at least another one of the connection parts is disposed on each of two opposite end edges of one of the second high-density regions in the longitudinal direction.
6 . The optical fiber ribbon according to claim 1 , wherein a first region including one of the first high-density regions and the one of the first low-density regions is adjacent to a second region including one of the second high-density regions and the one of the second low-density regions in the disposition direction.
7 . The optical fiber ribbon according to claim 1 , wherein, in the disposition direction,
a dimension of one of the first high-density regions is equal to a dimension of the one of the first low-density regions, and
a dimension of one of the second high-density regions is equal to a dimension of the one of the second low-density regions.
8 . The optical fiber ribbon according to claim 1 , wherein one of the first high-density regions does not overlap one of the second high-density regions in the disposition direction.
9 . The optical fiber ribbon according to claim 1 , wherein the one of the first low-density region does not overlap the one of the second low-density regions in the disposition direction.
10 . An optical fiber ribbon comprising:
five or more optical fibers disposed in a disposition direction perpendicular to a longitudinal direction of the optical fiber ribbon; and
connection parts disposed intermittently in the longitudinal direction and the disposition direction, wherein each of the connection parts is disposed between and connects adjacent ones of the optical fibers, wherein
the optical fiber ribbon has:
a first high-density region and a first low-density region disposed at different positions in the longitudinal direction; and
a second high-density region and a second low-density region disposed at different positions in the longitudinal direction,
the first high-density region includes at least two of the connection parts that have different positions from each other in the longitudinal direction and the disposition direction,
the second high-density region includes at least another two of the connection parts that have different positions from each other in the longitudinal direction and the disposition direction,
a number density of the connection parts in the first low-density region is lower than a number density of the connection parts in the first high-density region,
a number density of the connection parts in the second low-density region is lower than a number density of the connection parts in the second high-density region,
a dimension in the longitudinal direction of a portion in which the first low-density region and the second low-density region overlap in the disposition direction is smaller than a dimension of the first low-density region in the longitudinal direction and a dimension of the second low-density region in the longitudinal direction, and
in the longitudinal direction, a left end of the first low-density region is offset from a left end of the second low-density region and a right end of the first low-density region is offset from a right end of the second low-density region.
11 . An optical fiber ribbon comprising:
five or more optical fibers disposed in a disposition direction perpendicular to a longitudinal direction of the optical fiber ribbon; and
connection parts disposed intermittently in the longitudinal direction and the disposition direction, wherein each of the connection parts is disposed between and connects adjacent ones of the optical fibers, wherein
the optical fiber ribbon has:
a first high-density region and a first low-density region disposed at different positions in the longitudinal direction; and
a second high-density region and a second low-density region disposed at different positions in the longitudinal direction,
the first high-density region includes at least two of the connection parts that have different positions from each other in the longitudinal direction and the disposition direction,
the second high-density region includes at least another two of the connection parts that have different positions from each other in the longitudinal direction and the disposition direction,
a number density of the connection parts in the first low-density region is lower than a number density of the connection parts in the first high-density region,
a number density of the connection parts in the second low-density region is lower than a number density of the connection parts in the second high-density region,
a dimension in the longitudinal direction of a portion in which the first low-density region and the second low-density region overlap in the disposition direction is smaller than a dimension of the first low-density region in the longitudinal direction and a dimension of the second low-density region in the longitudinal direction,
the first low-density region does not include a connection part,
the second low-density region does not include a connection part, and
a boundary between the first high-density region and the second high-density region in the disposition direction is located at a center of the optical fiber ribbon in the disposition direction.