US 12,222,574 B2
Optical fiber unit and optical fiber unit manufacturing method
Noriaki Yamashita, Sakura (JP); Akira Namazue, Sakura (JP); and Ken Osato, Sakura (JP)
Assigned to Fujikura Ltd., Tokyo (JP)
Appl. No. 18/012,371
Filed by Fujikura Ltd., Tokyo (JP)
PCT Filed Jun. 22, 2021, PCT No. PCT/JP2021/023658
§ 371(c)(1), (2) Date Dec. 22, 2022,
PCT Pub. No. WO2022/004498, PCT Pub. Date Jan. 6, 2022.
Claims priority of application No. 2020-114330 (JP), filed on Jul. 1, 2020.
Prior Publication US 2023/0266556 A1, Aug. 24, 2023
Int. Cl. G02B 6/44 (2006.01)
CPC G02B 6/448 (2013.01) [G02B 6/4482 (2013.01)] 5 Claims
OG exemplary drawing
 
1. An optical fiber unit comprising:
intermittently-connected optical fiber ribbons, wherein:
at least one of the intermittently-connected optical fiber ribbons comprises optical fibers including:
a first optical fiber, and
a second optical fiber that is longer than the first optical fiber;
the second optical fiber deforms in a thickness direction of the intermittently-connected optical fiber ribbons with respect to the first optical fiber, and
the following conditions are satisfied:

OG Complex Work Unit Math
and
c<0.05, where
b is an interval, in a length direction, between connection parts that connect the first optical fiber and the second optical fiber,
c (%) is a fiber length difference of the second optical fiber with respect to the first optical fiber, and
Y is an interval between the optical fibers in a ribbon width direction.