An optical cable including a load bearing core includes a longitudinally and radially extending slot housing at least one optical fibre, wherein the slot has a width providing a low clearance for the optical fibre(s) housed therein and preventing two optical fibres being stuck to one another; and the slot has a depth equal to or lower than a radius of the core.

A member for use in undersea applications comprising a plurality of conduits assembled into a bundle; the bundle being wrapped with a pressure-sensitive tape comprising a backing, a layer of corrosion-resistant filaments on one surface of the backing, and pressure-sensitive adhesive layer that coats the filaments and binds them to the backing.

A slot rod having a plurality of grooves for storing a plurality of optical fibers, a first layer disposed at a center of the slot rod, a second layer provided on an outer peripheral portion of the first layer, a third layer provided on an outer peripheral portion of the second layer, and an outermost layer provided on an outer peripheral portion of the third layer, and the third layer is formed of a material having higher adhesiveness to the outermost layer than a material in a case where the third layer is formed of the same material as the outermost layer.

Provided is an optical fiber ribbon capable of achieving higher density and reduction in diameter and accurately placing optical fibers in V-shape grooves in a fusion machine without failure. The optical fiber ribbon 1 includes three or more of optical fibers 2 arranged in parallel and connecting portions 3 connecting adjacent two optical fibers 2 together, the connecting portions 3 being intermittently provided in each of a ribbon longitudinal direction and a ribbon width direction. The connecting portions 3 are each formed in such a manner as to fill resin into a gap S formed between adjacent two optical fibers 2, and both surfaces of the respective connecting portions 3 are each formed into a recess having a concave shape curved toward a center of the gap S to separate from lines 4,5 each connecting contact points of the optical fibers 2 when being placed on a horizontal surface.

An optical fiber cable comprises optical units having a plurality of optical fiber ribbons, a slot rod having a plurality of slot grooves in which the optical units are accommodated, and a cable sheath configured to cover an outer side of the slot rod, each of the optical fiber ribbons is intermittently provided with coupling portions, at which adjacent optical fibers are coupled therebetween, and non-coupling portions, at which adjacent optical fibers are not coupled therebetween, in a longitudinal direction between a part or all of the optical fibers in a state where the plurality of optical fibers is arranged in parallel, and an outer diameter of the optical fiber cable is 35 mm or less and a number of the optical fibers in the optical unit accommodated in one slot groove is 100 or more.

An optical cable including a load bearing core includes a longitudinally and radially extending slot housing at least one optical fibre, wherein the slot has a width providing a low clearance for the optical fibre(s) housed therein and preventing two optical fibres being stuck to one another; and the slot has a depth equal to or lower than a radius of the core.

An optical fiber cable comprises optical units having a plurality of optical fiber ribbons, a slot rod having a plurality of slot grooves in which the optical units are accommodated, and a cable sheath configured to cover an outer side of the slot rod, each of the optical fiber ribbons is intermittently provided with coupling portions, at which adjacent optical fibers are coupled therebetween, and non-coupling portions, at which adjacent optical fibers are not coupled therebetween, in a longitudinal direction between a part or all of the optical fibers in a state where the plurality of optical fibers is arranged in parallel, and an outer diameter of the optical fiber cable is 35 mm or less and a number of the optical fibers in the optical unit accommodated in one slot groove is 100 or more.

An optical cable including a load bearing core includes a longitudinally and radially extending slot housing at least one optical fiber, wherein the slot has a width providing a low clearance for the optical fiber(s) housed therein and preventing two optical fibers being stuck to one another; and the slot has a depth equal to or lower than a radius of the core.

Provided is an optical fiber ribbon capable of achieving higher density and reduction in diameter and accurately placing optical fibers in V-shape grooves in a fusion machine without failure. The optical fiber ribbon 1 includes three or more of optical fibers 2 arranged in parallel and connecting portions 3 connecting adjacent two optical fibers 2 together, the connecting portions 3 being intermittently provided in each of a ribbon longitudinal direction and a ribbon width direction. The connecting portions 3 are each formed in such a manner as to fill resin into a gap S formed between adjacent two optical fibers 2, and both surfaces of the respective connecting portions 3 are each formed into a recess having a concave shape curved toward a center of the gap S to separate from lines 4,5 each connecting contact points of the optical fibers 2 when being placed on a horizontal surface.

Provided is an optical fiber ribbon capable of achieving higher density and reduction in diameter and accurately placing optical fibers in V-shape grooves in a fusion machine without failure. The optical fiber ribbon 1 includes three or more of optical fibers 2 arranged in parallel and connecting portions 3 connecting adjacent two optical fibers 2 together, the connecting portions 3 being intermittently provided in each of a ribbon longitudinal direction and a ribbon width direction. The connecting portions 3 are each formed in such a manner as to fill resin into a gap S formed between adjacent two optical fibers 2, and both surfaces of the respective connecting portions 3 are each formed into a recess having a concave shape curved toward a center of the gap S to separate from lines 4,5 each connecting contact points of the optical fibers 2 when being placed on a horizontal surface.