US 12,353,036 B2
Optical fiber cable
Akira Namazue, Sakura (JP); Shogo Shimizu, Sakura (JP); Go Taki, Chiba (JP); Okimi Mukai, Sakura (JP); and Ken Osato, Sakura (JP)
Assigned to Fujikura Ltd., Tokyo (JP)
Filed by Fujikura Ltd., Tokyo (JP)
Filed on Sep. 11, 2023, as Appl. No. 18/464,463.
Application 18/464,463 is a continuation of application No. 17/268,313, granted, now 11,782,228, previously published as PCT/JP2020/046192, filed on Dec. 4, 2020.
Claims priority of application No. 2019-223813 (JP), filed on Dec. 11, 2019.
Prior Publication US 2023/0418013 A1, Dec. 28, 2023
Int. Cl. G02B 6/44 (2006.01)
CPC G02B 6/4431 (2023.05) [G02B 6/443 (2013.01); G02B 6/4432 (2013.01); G02B 6/44384 (2023.05)] 8 Claims
OG exemplary drawing
 
1. An optical fiber cable comprising:
a sheath comprising recesses and protrusions that are alternately disposed in a circumferential direction on an outer circumferential surface of the sheath;
a core that comprises optical fibers and is accommodated in the sheath;
exactly four tensile strength members embedded in the sheath; and
a ripcord that is embedded in the sheath, wherein
a marking portion protruding outward in a radial direction is disposed in the sheath,
the ripcord is disposed between the marking portion and the core,
two of the four tensile strength members are grouped into a first tensile strength member group, and the remaining two of the four tensile strength members are grouped into a second tensile strength member group,
the core is interposed between the two tensile strength member groups in a transverse cross-sectional view of the optical fiber cable,
the two of the four tensile strength members of the first tensile strength member group are embedded in two adjacent ones of the protrusions,
the remaining two of the four tensile strength members of the second tensile strength member group are not embedded in the two adjacent ones in which the first tensile strength member group is embedded, and
each of the two tensile strength member groups extends over a circumferential angle around an axis of the optical fiber cable that is greater than a circumferential angle around the axis between valleys of two adjacent ones of the recesses between which one of the two adjacent ones is disposed, and less than a circumferential angle around the axis between valleys of the recesses between which the two adjacent ones are interposed.