A method of manufacturing an aerial micromodule cable with excess length of an optical core is disclosed, the cable comprising a cable jacket defining a cavity in which the optical core is arranged, said cable having two rigid strength members embedded in the wall of the jacket; the method comprising guiding the cable over a wheel; wherein a first plane (P1) intersecting the centre of gravity (C1) of the cable cavity is parallel to a second plane (P2) intersecting the two rigid strength members, said first and second planes (P1, P2) being offset from each other, and wherein, during said guiding, the two rigid strength members are positioned closer to the wheel than the first plane (P1) so as to cause the optical core to have a core excess length of at least 0.05%.

Systems, apparatus and methods for performing laser operations in boreholes and other remote locations, such operations including laser drilling of a borehole in the earth. Systems, apparatus and methods for generating and delivering high power laser energy below the surface of the earth and within a borehole. Laser operations using such downhole generated laser beams.

An X-ray generating device includes an X-ray tube, an X-ray tube drive circuit, an electron acceleration voltage generation circuit, and a control unit communicating with the drive circuit and the voltage generation circuit, the X-ray tube, the drive circuit, and the voltage generation circuit are arranged inside a storage container filled with an insulating oil, a path connecting the drive circuit and the control unit includes an optical fiber cable arranged inside the storage container, the optical fiber cable has a coating that suppresses fluctuation due to a convective flow of the insulating oil, the coating is cured by, from a resin material containing a plasticizer, a part of the plasticizer being leaching out, and the control unit is configured to facilitate leaching of the plasticizer by driving the voltage generation circuit to apply a voltage to the optical fiber cable in a state of no X-ray being generated.

An X-ray generating device includes an X-ray tube, an X-ray tube drive circuit, an electron acceleration voltage generation circuit, and a control unit communicating with the drive circuit and the voltage generation circuit, the X-ray tube, the drive circuit, and the voltage generation circuit are arranged inside a storage container filled with an insulating oil, a path connecting the drive circuit and the control unit includes an optical fiber cable arranged inside the storage container, the optical fiber cable has a coating that suppresses fluctuation due to a convective flow of the insulating oil, the coating is cured by, from a resin material containing a plasticizer, a part of the plasticizer being leaching out, and the control unit is configured to facilitate leaching of the plasticizer by driving the voltage generation circuit to apply a voltage to the optical fiber cable in a state of no X-ray being generated.

A metal sheathed cable includes an optical unit and a control unit helically twisted together, a grounding wire unit distributed in the gaps between the optical unit and the control unit to form an inner layer cable core, a filler watertightly filled into gaps among the optical unit, the control unit and the grounding wire unit, and a taped covering arranged outside the inner layer cable core; a power unit and a filling core helically twisted around the inner layer cable core, the grounding wire unit distributed in the gap between the power unit and the filling core, the filler watertightly filled into gaps among the power unit, the grounding wire unit and the filling core, and the taped covering arranged outside the outer layer cable core; an inner protective layer wrapped outside the outer layer core, and a sheathing layer twisted outside the inner protective layer.

A power cable assembly device adapted to be arranged in the spaces between neighboring power cores of a power cable. The power cable assembly device includes an extruded profiled body made of a polymer material having a first, second, and third walls. The first wall being convex and having an exterior surface adapted to face a jacket of the power cable. The profiled body also having a chamber wall extending from the second to the third wall, defining a slit and adapted to receive a fiber optic cable.

A plurality of telecommunications connections are installed in a distribution network by connecting a series of distribution points using a multicore cable comprising a plurality of cores having a common enclosure, some of the cores carrying fiber tubes into which optical fiber may later be introduced, and other cores carrying an electrical power supply. One or more cores may be diverted from a longer cable run to serve a local distribution point by rupturing a web connecting the core to the rest of the cable, thus allowing the remaining cores to be uninterrupted at the point of divergence. An alternative embodiment intended for underground use provides for apertures to be opened in a protective sheath to expose the individual cores required to be diverted to a local distribution point.

A plurality of telecommunications connections are installed in a distribution network by connecting a series of distribution points using a multicore cable comprising a plurality of cores having a common enclosure, some of the cores carrying fiber tubes into which optical fiber may later be introduced, and other cores carrying an electrical power supply. One or more cores may be diverted from a longer cable run to serve a local distribution point by rupturing a web connecting the core to the rest of the cable, thus allowing the remaining cores to be uninterrupted at the point of divergence. An alternative embodiment intended for underground use provides for apertures to be opened in a protective sheath to expose the individual cores required to be diverted to a local distribution point.

Micromodule cables include subunit, tether cables having both electrical conductors and optical fibers. The subunits can be stranded within the micromodule cable jacket so that the subunits can be accessed from the micromodule cable at various axial locations along the cable without using excessive force. Each subunit can include two electrical conductors so that more power can be provided to electrical devices connected to the subunit.

A metal sheathed cable includes an optical unit and a control unit helically twisted together, a grounding wire unit distributed in the gaps between the optical unit and the control unit to form an inner layer cable core, a filler watertightly filled into gaps among the optical unit, the control unit and the grounding wire unit, and a taped covering arranged outside the inner layer cable core; a power unit and a filling core helically twisted around the inner layer cable core, the grounding wire unit distributed in the gap between the power unit and the filling core, the filler watertightly filled into gaps among the power unit, the grounding wire unit and the filling core, and the taped covering arranged outside the outer layer cable core; an inner protective layer wrapped outside the outer layer core, and a sheathing layer twisted outside the inner protective layer.