An optical fiber cable that includes subunits is provided. The cable has an outer jacket having a thickness of at least 2.0 millimeters and that is made from a fire retardant polymer material having a PHRR value of 222 kw/m.sup.2 when tested in a cone calorimeter measured according to ASTM E1354 with a heat flux of 50 kW/m.sup.2. The cable meets the requirement of UL 1666 burn test for riser cables and the requirements of EN 50399 burn test for CPR class C.sub.ca cables.

An optical fiber cable with one or more coil elements is provided. The optical fiber cable (200, 300, 400) comprises one or more optical transmission elements (202, 302, 402) extending in a longitudinal direction surrounded by one or more coil elements (100). The one or more coil elements are a series of loops such that each loop (106) from the series of loops is physically connected to adjacent loops. The one or more coil elements are flexible in transverse direction and are substantially non-elongatable in the longitudinal direction. The one or more coil elements are fiber retaining element (102) such that subsequent loops (106) are made of a single continuous element and further comprises a pitch retaining element (104) connecting the subsequent loops of the fiber retaining element to preserve relative position of the subsequent loops.

An optical cable including a rollable optical fiber ribbon is provided. The optical cable includes a plurality of loose tubes, and a plurality of rollable optical fiber ribbons are disposed inside each loose tube. A plurality of loose tubes are disposed at the periphery of the central strength member. The length of each rollable optical fiber ribbon disposed inside the loose tube is 1% or more longer than the length of the corresponding loose tube.

Compared to an optical cable including a conventional ribbon, the optical fiber has a higher density and preferred transmission performance.

The present invention relates to an optical fiber cable (100) including one or more optical fibers (102), one or more tubular structures (104), a sheath (106) surrounding the one or more tubular structures (104) and a plurality of strength members (108) partially embedded in the sheath (106). In particular, each tubular structure (104) has at least one optical fiber. Moreover, the plurality of strength members (108) in the optical fiber cable (100) are n+1, where n is an even integer.

Fiber blocking apparatuses couple to an outside fiber optic cable and include a damping unit that prevents damaging (e.g., micro-fracturing) optical fibers received from the outside fiber optic cable and blocks a gelatinous element from advancing out of the outside fiber optic cable. The fiber blocking apparatuses may include a view port providing visibility of a routing of the optical fibers in the fiber blocking apparatuses.

The present disclosure provides an optical fiber cable. The optical fiber cable includes at least one optical fiber ribbon stack. In addition, the at least one optical fiber ribbon stack includes a plurality of stacked ribbons. Further, each ribbon of the plurality of stacked ribbons includes a plurality of optical fibers. The plurality of optical fibers includes edge fibers. The edge fibers are defined as the at least one optical fiber having a mach number of at most 7.2 disposed at a first end and a second end of a first ribbon and a last ribbon of the plurality of stacked ribbons.

The disclosed fiber optic cable may include (1) a plurality of optical fibers, (2) a core tube surrounding the plurality of optical fibers, (3) a thixotropic gel filling an interstitial space among the optical fibers within the core tube, (4) an intermediate layer surrounding the core tube, where the intermediate layer includes a plurality of linear elements contra-helically wrapped about the core tube, and (5) an outer layer surrounding the intermediate layer, where the outer layer includes a combination of a moisture-cure cross-linked material and an activation catalyst, where the outer layer is formed by masticating and extruding the combination onto the intermediate layer. Various other cables, assemblies, and methods are also disclosed.

An optical fiber ribbon comprises a plurality of optical fiber strands that are arranged side-by-side in one direction and integrated. The optical fiber ribbon comprises a plurality of optical fiber strands that are bonded in parallel. In the optical fiber ribbon, the adjacent optical fiber strands are bonded using a bonding section in which the same are continuously bonded along the entire length thereof and a bonding section in which the same are intermittently bonded at prescribed intervals. In other words, either of the bonding sections is formed between the adjacent optical fiber strands.

Systems and methods are provided for applying a protective graphene barrier to waveguides and using the protected waveguides in wellbore applications. A well monitoring system may comprise a waveguide comprising a graphene barrier, wherein the graphene barrier comprises at least one material selected from the group consisting of graphene, graphene oxide, and any combination thereof; a signal generator capable of generating a signal that travels through the waveguide; and a signal detector capable of detecting a signal that travels through the waveguide.

An optical communication cable subassembly includes a cable core having optical fibers each comprising a core surrounded by a cladding, buffer tubes surrounding subsets of the optical fibers, and a binder film surrounding the buffer tubes. Armor surrounds the cable core, the binder film is bonded to an interior of the armor, and water-absorbing powder particles are provided on an interior surface of the binder film.