An optical fiber includes a glass portion, a primary coating layer, and a secondary coating layer. In the optical fiber, a value of microbend loss characteristic factor F.sub.μBL_GΔβ is 6.1 ([GPa.sup.−1.Math.μm.sup.−2.5/rad.sup.8].Math.10.sup.−12) or less when represented by
F.sub.μBL_GΔβ=F.sub.μBL_G×F.sub.μBL_Δβ,
where F.sub.μBL_G is geometry microbend loss characteristic and F.sub.μBL_Δβ is optical microbend loss characteristic.

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.

Embodiments of an optical fiber cable are provided. The optical fiber cable includes an outer jacket, an inner jacket, a porous insulating layer, and at least one optical fiber. The outer jacket has a first thickness between its inner surface and its outer surface. The inner jacket has a second thickness between its inner surface and its outer surface. The inner jacket is disposed within the outer jacket. The porous insulating layer is disposed between the inner jacket and the outer jacket. The porous insulating layer is configured to reduce the transfer of heat to the inner jacket during combustion of the outer jacket. The optical fiber is disposed within the inner jacket. In the optical fiber cable, the first thickness is less than the second thickness, and each of the outer jacket and the inner jacket include at least one flame retardant additive.

An optical fiber includes a glass portion, a primary coating layer, and a secondary coating layer. In the optical fiber, a value of microbend loss characteristic factor F.sub.μBL_GΔβ is 6.1 ([GPa.sup.−1.Math.μm.sup.−2.5/rad.sup.8].Math.10.sup.−12) or less when represented by

F.sub.μBL_GΔβ=F.sub.μBL_G×F.sub.μBL_Δβ,

where F.sub.μBL_G is geometry microbend loss characteristic and F.sub.μBL_Δβ is optical microbend loss characteristic.

The present disclosure provides an optical fibre ribbon. The optical fibre ribbon includes a plurality of optical fibres bonded with a matrix material. The matrix material is applied along a longitudinal length of the plurality of optical fibres. Further, the plurality of optical fibres is defined by a geometrical centre and diameter. Further, the plurality of optical fibres has a predefined distance between geometrical centres of any two adjacent optical fibres of the plurality of optical fibres. Moreover, the predefined distance between geometrical centres of any two adjacent optical fibres of the plurality of optical fibres is less than 200 microns. Further, the optical fibre ribbon provides the optical fibre ribbon cable that is flexible and easy to install in space constraint regions and allows ribbons to bend easily at non-preferential axis. Furthermore, the optical fibre ribbon with reduced weight and with high mass fusion splicing capability.

A ground wire with optical fibers is disclosed. The ground wire includes twisted optical modules in the form of plastic tubes that accommodate freely placed optical fibers and water-blocking gel, wherein water-blocking tape applied to twisted optical modules, which are enclosed in a steel tube, coated with an aluminum sheath. The aluminum sheath is helically wrapped with lays of wire. The technical result is provided by increased air tightness of the optical core and permissible crushing stresses.

The present disclosure provides a formfitting loose tube for optic cables. The formfitting loose tube includes a loose tube wall. The loose tube wall includes first sides, second sides, a plurality of deformation induction tabs and a plurality of fiber optics stacked together having a shape form. The plurality of deformation induction tabs includes curving sections. The curving sections intersect the first sides and the second sides at intersections. The first sides and the second sides of the loose tub wall are configured to fit the shape form of the plurality of fiber optics stacked together. The plurality of deformation induction tabs induces elastic deformation of the loose tube wall under external stress.

The present disclosure provides a rollable optical fiber ribbon. The rollable optical fiber ribbon includes a plurality of optical fibers positioned along a longitudinal axis of the rollable optical fiber ribbon. In addition, the rollable optical fiber ribbon includes a matrix material covering the plurality of optical fibers to provide flexibility to the rollable optical fiber ribbon. Further, the rollable optical fiber ribbon includes at least one colour line marking on the rollable optical fiber ribbon along the longitudinal axis of the rollable optical fiber ribbon.

An armored cable includes a core and an armor surrounding the core. The armor includes at least one armor access feature formed in the armor to weaken the armor at the access feature. A jacket surrounds the armor and the jacket includes a primary portion of a first extruded polymeric material and at least one discontinuity of a second extruded polymeric material in the primary portion, the discontinuity extending along a length of the cable, and the first material being different from the second material, wherein the bond between the discontinuity and the primary portion allows the jacket to be separated at the discontinuity to provide access to the core, and the at least one armor access feature and the at least one discontinuity are arranged proximate to each other to allow access to the core.

Embodiments of an optical fiber cable are provided. The optical fiber cable includes an outer jacket, an inner jacket, a porous insulating layer, and at least one optical fiber. The outer jacket has a first thickness between its inner surface and its outer surface. The inner jacket has a second thickness between its inner surface and its outer surface. The inner jacket is disposed within the outer jacket. The porous insulating layer is disposed between the inner jacket and the outer jacket. The porous insulating layer is configured to reduce the transfer of heat to the inner jacket during combustion of the outer jacket. The optical fiber is disposed within the inner jacket. In the optical fiber cable, the first thickness is less than the second thickness, and each of the outer jacket and the inner jacket include at least one flame retardant additive.