Optical fiber unit and optical cable
An optical fiber unit includes: a plurality of optical fibers; and a tube covering the plurality of optical fibers. In the optical fiber unit, a tensile elongation rate of the tube is 100% or more and 500% or less. An optical cable includes: a plurality of optical fiber units; and a cable sheath covering the plurality of optical fiber units. In the optical cable, each of the plurality of optical fiber units includes: a plurality of optical fibers; and a tube covering the plurality of optical fibers, and a tensile elongation rate of the tube is 100% or more and 500% or less.
1 . An optical fiber unit comprising:
a plurality of optical fibers; and
a tube covering the plurality of optical fibers,
wherein a tensile elongation rate of the tube is 150% or more and 450% or less to optimize both tearability and extrudability of the tube.
2 . The optical fiber unit according to claim 1 ,
wherein a tensile strength of the tube is 5 MPa or more and 30 MPa or less.
3 . The optical fiber unit according to claim 1 ,
wherein the tube contains:
a block copolymer of polybutylene terephthalate and polyether; and
silica, and
wherein a content of the silica is 1.6 parts by mass or more and 2.6 parts by mass or less with respect to 100 parts by mass of the block copolymer.
4 . An optical cable comprising:
a plurality of optical fiber units; and
a cable sheath covering the plurality of optical fiber units, wherein each of the plurality of optical fiber units comprises:
a plurality of optical fibers; and
a tube covering the plurality of optical fibers, and
wherein a tensile elongation rate of the tube is 150% or more and 450% or less to optimize both tearability and extrudability of the tube.