In this multi-core fiber, a plurality of cores are arranged at a prescribed interval, and the peripheries thereof are covered by a cladding having a lower refractive index than the plurality of cores. A resin coating is formed on the outer periphery of the cladding. A colored section is formed on a section of the outer surface of the resin coating in the peripheral direction. The colored section is formed continuously along the length direction of the multi-core fiber. In a multi-core fiber cross section orthogonal to the length direction, the position of a specific core and the peripheral position where the colored section is formed are substantially constant along the length direction of the multi-core fiber. In other words, in the multi-core fiber cross section orthogonal to the length direction, the position of the specific core and the position where the colored section is formed are substantially constant along the length direction of the multi-core fiber.

An optical fiber cable comprising a stack of optical fiber ribbons. The stack comprises corner fibers at the corners of the stack, edge fibers the edges of the stack, and internal fibers that are internal to the stack. The corner fibers have a higher tolerance to fiber bending (or lower sensitivity to bending) than the internal fibers.

Embodiments of the invention include an optical fiber cable. The optical fiber cable includes a plurality of multi-fiber unit tubes. The multi-fiber unit tubes are substantially circular and dimensioned to receive a plurality of optical fibers. The optical fiber cable also includes a plurality of partially bonded optical fiber ribbons positioned within at least one of the multi-fiber tubes. The partially bonded optical fiber ribbons are partially bonded in such a way that each partially bonded optical fiber ribbon is formed in a random shape. The partially bonded optical fiber ribbons also are partially bonded in such a way that the plurality of partially bonded optical fiber ribbons are randomly positioned within the multi-fiber unit tube. The optical fiber cable also includes a jacket surrounding the plurality of multi-fiber unit tubes.

A cable connection structure for fiber optic hardware connection is provided. In one example, a cable connection structure includes at least one connector set including a plurality of fiber optic connectors. Each of the fiber optic connectors has a corresponding connecting cable coupled thereto. A cable sorter has a first end connected to the connecting cable. A ribbon cable is connected to a second end of the cable sorter through a fiber cable clamp.

A rollable optical fiber ribbon utilizing low attenuation, bend insensitive fibers and cables incorporating such rollable ribbons are provided. The optical fibers are supported by a ribbon body, and the ribbon body is formed from a flexible material such that the optical fibers are reversibly movable from an unrolled position to a rolled position. The optical fibers have a large mode filed diameter, such as ≥9 microns at 1310 nm facilitating low attenuation splicing/connectorization. The optical fibers are also highly bend insensitive, such as having a macrobend loss of ≤0.5 dB/turn at 1550 nm for a mandrel diameter of 15 mm.

A fiber optic cable includes a jacket forming a cavity therein, the jacket having an indentation on the exterior thereof that forms a ridge extending into the cavity along the length of the jacket; and a stack of fiber optic ribbons located in the cavity, each ribbon having a plurality of optical fibers arranged side-by-side with one another and coupled to one another in a common matrix, wherein corners of the ribbon stack pass by the ridge at intermittent locations along the length of the jacket, and wherein interaction between the ridge and the ribbon stack facilitates coupling of the ribbon stack to the jacket.

An optical fiber cable includes: a plurality of ribs formed along a longitudinal direction of a cable; and a slot core in which a slot grove for housing an optical fiber ribbon is formed between the ribs. In the slot groove, a plurality of optical fiber ribbons are bundled and a plurality of subunits whose periphery is wound with a bundle material are provided, and the bundle materials between the plurality of subunits are bonded to each other.

An optical cable is provided. The optical cable includes an outer cable body jacket and a plurality of optical fiber subunits. The optical fibers within each subunit are stranded relative to each other and are located within a thin subunit jacket. A plurality of unstranded optical fiber subunits are located within the cable jacket.

A fiber optic cable includes a stranded ribbon stack, a sheath extruded around the stranded ribbon stack to form a subunit, and an extruded foam layer, wherein the foam layer has a minimum inner diameter that is less than or equal to a maximum stack diagonal dimension of the stranded ribbon stack.

A slot type optical cable includes: an optical fiber; a slot rod that includes a plurality of ribs forming a groove in which the optical fiber is accommodatable; and a cable jacket that is provided around the slot rod. The cable jacket includes a sheath portion that is formed around the slot rod at substantially the same thickness by linearly connecting outermost peripheral edges of adjacent ribs.