A method may include (1) coating a segment of fiber optic cable with an adhesive substance, (2) forming a coil of the segment of fiber optic cable, (3) deforming the coil into a noncircular shape defining a slot external to the coil while obeying a minimum bend radius requirement for the segment of fiber optic cable, and (4) activating the adhesive substance to stabilize the noncircular shape of the coil. Various other methods and apparatuses, such as those for performing the deforming operation, are also disclosed.

Aspects of the technology relate to rotational electromechanical systems, in which data and or power are supplied to components while one part of the system is rotating relative to another part of the system. Repeated rotation may create strain on or otherwise cause the cables to intermittently or permanently fail. A helical cable management system is provided that enables full rotation to the extent permitted. One or more cables are wound in a helical shape around the axis of rotation, which distributes the deformation of the cable along the helical length. Rotation in one direction causes the helix diameter to increase, while rotation in the other direction causes the helix diameter to decrease. A structure is used to maintain the distance between helical turns, while permitting the increase and decrease of the helix diameter. This reduces the overall strain on the cables, which can significantly extend their useful lifetime.

Provided is a method of manufacturing a downhole cable, the method including, forming a helical shape in an outer circumferential surface of a metal tube, the metal tube having a fiber element housed therein, and stranding a copper element in a helical space formed by the metallic tube. Also provided is a downhole cable including, a metallic tube having a helical space in an outer circumferential surface thereof, wherein the metallic tube has a fiber element housed therein, and a copper element disposed in a helical space formed by the steel tube. Double-tube and multi-tube configurations of the downhole cable are also provided.

An optical fiber cable includes: optical fiber units obtained by collecting a plurality of optical fiber ribbons in which a plurality of optical fibers are arranged in parallel; and a slot rod including a plurality of slot grooves formed in a spiral shape in order to store the optical fiber units. The optical fiber units are stranded in a longitudinal direction of the optical fiber cable in a state in which the optical fiber ribbons are not twisted, and the optical fiber units are stored in the longitudinal direction of the optical fiber cable in a state of being untwisted stranding in the slot grooves.

Electrode cabling, including a core and n wires coiled on the core in an arrangement topologically equivalent to an n-start thread configuration, wherein n is an integer greater than one. The cabling also includes a sheath covering the n wires and an electrode attached through the sheath to a given wire selected from the n wires.

A multi-member cable includes at least a first cable element and a second cable element. The first and second cable elements twist around a center axis of the cable in a counterclockwise direction multiple times to a first reversal point, then twist about the center axis of the cable in a clockwise direction multiple times until a second reversal point, with this pattern repeating along a length of the cable. Adhesion points are formed at intervals along a length of the cable to connect the first and second cable elements. The adhesion points may be spaced apart at an interval equal to a distance between the first and second reversal points. An outer surface of a jacket of the cable may include indications at the first and/or second reversal points, such as physical bumps or markings.

A method for attaching an electrode to cabling, including providing a cable having a plurality of insulated wires coiled around a central core. The method further includes removing insulation from each wire in a set of the coiled wires so as to provide a respective access channel to a respective section of a respective conductor of each wire in the set while the respective section remains coiled on the central core. The method further includes fastening a respective electrode to the respective access channel while the respective section remains coiled on the central core.

Provided is an optical fiber cable that is easier to be laid and enables higher-density packaging than an existing cable. This optical fiber cable is a slotless type optical fiber cable including: an optical unit formed by collecting and twisting a plurality of optical fibers or ribbons each formed by arranging the plurality of optical fibers; a cable core housing the optical unit; and a cable jacket provided around the cable core, and a tension member made of a fiber body within the cable core.

A fiber laser apparatus includes a pumping light source which launches pumping light, an amplifying optical fiber which includes a core and a noncircular cladding, and absorbs the pumping light to launch laser light, an amplifying coil which has a configuration around which the amplifying optical fiber is wound, a first reflector which is provided on an input side of the amplifying coil and is configured to reflect the laser light toward the amplifying coil, and a second reflector which is provided on a launching side of the amplifying coil, has a lower reflectance than a reflectance of the first reflector, and is configured to reflect the laser light toward the amplifying coil.

An optical fiber cable manufacturing method using a manufacturing apparatus including an SZ twisting device, an extrusion molding device, and a pressing portion disposed between the SZ twisting device and the extrusion molding device is provided. The method including: twisting optical fibers or optical fiber units in an SZ manner using the SZ twisting device to form an optical fiber bundle; and covering the optical fiber bundle with a sheath using the extrusion molding device while pressing the optical fiber bundle using the pressing portion.