Optical fiber ribbon

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.

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.