Embodiments of the disclosure relate to an optical fiber cable. The optical fiber cable includes a subunit having a first interior surface and a first exterior surface. The first interior surface defines a central bore along a longitudinal axis of the optical fiber cable. At least one optical fiber is disposed within the central bore of the subunit, and a plurality of strengthening yarns is disposed around the subunit. A cable sheath disposed around the plurality of strengthening yarns. The cable sheath has a second interior surface and a second exterior surface. The second exterior surface defines an outermost surface of the optical fiber cable. The cable sheath includes from 55% to 68% by weight of a mineral-based flame retardant additive and from 35% to 45% by weight of a polymer blend. The polymer blend includes a co-polyester or co-polyether and a polyolefin or a polyolefin elastomer.

A fibre optic cable (500, 700) comprises retractable fibre units (502) extending in parallel with one another within an extruded polymer tube (504). The fibre units are free to slide in the tube such that a selected fibre unit (702a) can be accessed and re-directed by forming an opening in a wall of the tube (504) and withdrawing the selected fibre unit through the opening (710). Each fibre unit comprises two or more optical fibres (506) embedded in a solid resin material (520) to form a coated fibre bundle and an extruded polymer sheath (524). The fibre optic cable is manufactured by feeding the fibre units through an extrusion head (602) by which the extruded tube (504) is formed. The sheath (524) of each fibre unit is primarily polyethylene. A lining (510) of the extruded polymer tube is formed by polymer other than polyethylene, for example polypropylene.

Embodiments of the disclosure relate to an optical fiber cable. The optical fiber cable includes a subunit having a first interior surface and a first exterior surface. The first interior surface defines a central bore along a longitudinal axis of the optical fiber cable. At least one optical fiber is disposed within the central bore of the subunit, and a plurality of strengthening yarns is disposed around the subunit. A cable sheath disposed around the plurality of strengthening yarns. The cable sheath has a second interior surface and a second exterior surface. The second exterior surface defines an outermost surface of the optical fiber cable. The cable sheath includes from 55% to 68% by weight of a mineral-based flame retardant additive and from 35% to 45% by weight of a polymer blend. The polymer blend includes a co-polyester or co-polyether and a polyolefin or a polyolefin elastomer.

A factory processed fiber optic ferrule assembly and field installable cable system are configured to pass through tight, microducts when routed to a demarcation point. A connector housing attaches to the fiber optic ferrule assembly at the demarcation point (or after leaving the tight, microducts) to form a connectorized end of the optical fiber. A fiber tip is protected before leaving the factory until connection is desired.

An optical fiber cable includes a plurality of intermittently connected optical fiber ribbons inside a cable sheath, in which a fibrous filler or an FRP using the fibrous filler is provided on at least one pair of diagonals of the two diagonal directions approximately orthogonal to each other inside the cable sheath. An average linear expansion coefficient of the fibrous filler at −40° C. to +70° C. is smaller than an average linear expansion coefficient of the cable sheath at −40° C. to +70° C.

A fibre optic cable (500, 700, 1420) comprises one or more fibre units (502, 1302). Each fibre unit comprises two or more optical fibres (506, 1306) embedded in a solid resin material (520, 1320) to form a coated fibre bundle and an extruded polymer sheath (524, 1324). The sheath (524, 1324) of each fibre unit is primarily polybutylene terephthalate (PBT), with a friction reducing additive such as polydimethylsiloxane (PDMS). The additive may be polythene based and/or polyacrylate based. The fibre unit may be applied in a pullback cable (500, 800, 1100), as a cable for pulling or pushing or as a blown fibre cable (502, 1302).

The present disclosure provides an optical fibre cable (100) with high blowing performance. The optical fibre cable (100) includes a plurality of optical fibres (102), a sheath (104) and one or more strength members (106). The sheath (104) envelops the plurality of optical fibres (102). The one or more strength members (106) are embedded in the sheath (104). The one or more strength members (106) embedded in the sheath (104) provides a blowing ratio to the optical fibre cable (100) in a range of about 20 to 45. The blowing ratio is a ratio of cross-sectional area of the sheath (104) to total cross-sectional area of the embedded strength members (106). FIG. 2

Certain aspects of the present disclosure provide techniques for making armored cables. An example method for making an armored cable includes forming a strip stock into an armor tubing; welding a seam of the armor tubing in a welding zone; inserting at least one of a first optical fiber or a first wire into a first end of a first guide tube, wherein: the first guide tube extends through the welding zone; the first guide tube protects the at least one of the first optical fiber or the first wire during the welding of the seam; and the first guide tube is not part of the armored cable after the making of the armored cable; and supporting the first guide tube within the armor tubing by a plurality of support legs such that the first guide tube does not contact the armor tubing.

A fiber optic cable includes a cable jacket having an outer surface defined by a cable jacket outer diameter J.sub.OD and an inner surface defined by a cable jacket inner diameter J.sub.ID; a plurality N of optical fibers, where N≥4, contained within the cable jacket and positioned a distance away from the cable jacket inner diameter, with each optical fiber having a core, a cladding surrounding the core, and at least one coating surrounding the core with the at least one coating having an outer coating diameter less than or equal to about 200 microns and wherein the cable jacket outer diameter J.sub.OD is less than or equal to 1 mm.

An optical fiber cable includes a plurality of intermittently connected optical fiber ribbons inside a cable sheath, in which a fibrous filler or an FRP using the fibrous filler is provided on at least one pair of diagonals of the two diagonal directions approximately orthogonal to each other inside the cable sheath. An average linear expansion coefficient of the fibrous filler at −40° C. to +70° C. is smaller than an average linear expansion coefficient of the cable sheath at −40° C. to +70° C.