Optical fiber drop cable
An optical fiber drop cable includes an optical element portion having an optical fiber core wire and a pair of first tension members disposed parallel to the optical fiber core wire on both sides thereof in a sandwiching manner. The optical fiber core wire and the pair of first tension members are coated with a cable sheath. A long-scale cable support wire portion has a second tension member coated with a sheath. The optical element portion and the cable support wire portion are adhered parallel to each other. The first tension members are composed of a nonconductive material. A flexural rigidity of the optical element portion is in a range from 80 to 500 Nmm 2 .
1. An optical fiber drop cable comprising:
an optical element portion comprising an optical fiber and a pair of first tension members coated with a first sheath, at least one of the first tension members comprising a star-shaped cross section, a portion of the first sheath disposed in voids defined by the star-shaped cross section;
a support wire portion comprising a second tension member coated with a second sheath; and
a neck portion connecting the optical element portion and the support wire portion, the neck portion defining slits formed intermittently along a length of the neck portion.
2. The cable according to claim 1 wherein at least one of the first tension members comprises an aggregate of nonconductive tension fibers.
3. The cable according to claim 1 , wherein the first and second sheaths comprise a common thermoplastic resin.
4. The cable according to claim 2 , wherein at least one of the fibers has a Young's modulus of at least 5000 kg/mm 2 , and a quantity of the fibers is between 1000 and 2000 denier.
5. The cable according to claim 2 , wherein a fiber filling factors of the fibers comprises at least 50% of a cross sectional area of the first tension members.
6. The cable according to claim 1 , wherein at least one of the first tension members comprises a nonconductive material.
7. The cable according to claim 1 , wherein the first tension members are disposed on opposite sides of the optical fiber.
8. The cable according to claim 1 , wherein the first tension members extend in a direction about parallel to a direction in which the optical fiber extends.
9. An optical fiber drop cable comprising:
an optical element portion comprising an optical fiber and a pair of first tension members coated with a sheath, at least one of the sheath tension members comprising a star-shaped cross section, a portion of the sheath disposed in voids defined by the star-shaped cross section,
wherein at least one of the first tension members comprises an aramid fiber having a yarn fineness between 2500 and 18500 denier.
10. The cable according to claim 9 , wherein each of the first tension members comprises the aramid fiber having the yarn fineness between 2500 and 18500 denier.
11. The cable according to claim 9 , wherein a flexural rigidity of the optical element portion is between 80 and 500 Nmm 2 .