An optical fiber cable includes: optical fiber units each having optical fibers; a wrapping tube that wraps around the optical fiber units; a filling disposed inside the wrapping tube; and a sheath that covers the wrapping tube. The optical fiber units includes outer units that are disposed at an outermost layer of the optical fiber units. The outer units are twisted in an SZ shape around a cable central axis of the optical fiber cable. The filling is sandwiched between one of the outer units and the wrapping tube in a cross-sectional view.

An optical fiber cable that includes subunits is provided. Optical fiber cables are used to transmit data over distance. The subunits are twisted and stranded within the cable to reduce degradation of stranding during use of the cable. The subunits of one or more optical fiber cables are arranged in complimentary configurations that counteract their varying asymmetrical forces to provide an improved handling performance for the optical fiber cable.

Embodiments of the disclosure relate to a bundled drop assembly. The bundled drop assembly includes a central member. The bundled drop assembly also includes an inner layer of subunits laid in a winding direction around the central member. The inner layer of subunits includes at least one subunit containing one or more optical fibers. Further, the bundled drop assembly includes at least one further layer of subunits laid around the inner layer of subunits in a same winding direction as the inner layer of subunits. The at least one further layer of subunits includes at least one subunit containing one or more optical fibers. The at least one further layer of subunits includes an outer layer of subunits that is the outermost layer of the bundled drop assembly.

An optical fiber cable includes: a core including optical fibers; an interposed layer including fibers wound around the core in an SZ shape; a reinforcing layer including metal and covering the interposed layer; and a sheath covering the reinforcing layer.

A jacket is provided to the outer circumference of a cable core, a rip cord, and a tension member. The cable core, the rip cord, and the tension member are collectively covered by the jacket. A wrapping tape is longitudinally placed on the outer circumference of a core part so as to be wound therearound. Thus, immediately after the wrapping tape is longitudinally placed and wound, a wrap part thereof is formed so as to lie substantially straight in the axial direction of an optical fiber cable. In contrast, in an optical fiber cable, the cable core is obtained by combining and intertwining the core part and the wrapping tape. Because of this configuration, the wrap part of the wrapping tape is helically disposed in the longitudinal direction.

An optical fiber cable includes a slot rod that is provided with a plurality of slot grooves in a spiral shape stranded in one direction, a tensile strength member that is provided inside the slot rod to receive tension, a cable sheath that covers an outer side of the slot rod, and a plurality of optical units made by gathering optical fiber ribbons in which a plurality of optical fibers is arranged in parallel. In each of the optical units, the optical fiber ribbons are stranded with each other along a longitudinal direction of the optical fiber cable. Each of the optical units is accommodated in corresponding one of the slot grooves along the longitudinal direction in a state where relative positional relationships between the optical units and the slot grooves are kept and relative positional relationships between the optical units are kept.

An optical fiber unit includes: an optical fiber ribbon in which a plurality of optical fibers are arranged in parallel and connected to each other; a colored bundle tape longitudinally wrapped around an optical fiber ribbon bundle in which a plurality of the optical fiber ribbons are stranded together; and a colored bundle yarn spirally wound around the optical fiber ribbon bundle and the bundle tape.

Embodiments of the disclosure relate to a method of preparing a bundled cable. In the method, a plurality of subunits is wound around a central member in one or more layers of subunits to form the bundled cable. For a section of the central member, each layer of subunits has a pitch over which a subunit of the layer of subunits makes one revolution around the section of the central member and a length of the subunit required to make the one revolution. The subunits are configured to have a nominal helical length equal to the ratio of a nominal length to a nominal pitch. Further, in the method, a measurement of the bundled cable is monitored, and a winding rate of the plurality of subunits is adjusted based on the measurement in order to account for deviations from the nominal helical length.

An optical fiber cable includes: optical fiber units each comprising optical fibers, and twisted together in an SZ shape; a wrapping tube that wraps around the optical fiber units; fillings disposed inside the wrapping tube, wherein the fillings include at least one first filling and at least one second filling that are located between two adjacent optical fiber units; and a sheath that covers the wrapping tube. The first filling is in contact with the wrapping tube. The second filling is located more radially inward than the first filling in a radial direction.

An optical cable includes: twisted optical fiber units each including a fiber group formed by optical fibers. At least one of the optical fiber units includes a filling that wraps an outer circumference of the fiber group.