Vented optical tube. At least some illustrative embodiments are conduits comprising a tube having a wall defining an interior volume of the tube. One or more optical fibers are disposed within the interior volume. The wall includes a plurality of vents passing from an outer surface of the wall to the interior volume, the plurality of vents disposed along a length of the tube, and wherein the vents are configured to convey a fluid in contact with the outer surface into the interior volume of the tube.

At least some illustrative embodiments are apparatus including a tube having a wall defining an interior volume, first and second optical fibers disposed within the interior volume and the first and second optical fibers joined at a first splice. Also included are third and fourth optical fibers disposed within the interior volume, the third and fourth optical fibers joined at a second splice. The first splice and the second splice have an axially spaced-apart relationship within the interior volume of the tube.

A pressure housing apparatus including a first cable termination shell, a housing connected to the first cable termination shell, a pressure vessel slide shell provided to the hollow housing, a cable termination assembly oriented within the housing, a plurality of pass through widows provided from the interior of the housing to the splice trays, and a plurality of circumferentially oriented splice trays provided to the cable termination assembly configured for receiving fiber tubes.

An intrusion detection system includes a suspended optical fiber having a neutral buoyancy and an optical time-domain reflectometer connected to the suspended optical fiber at an origin location. The suspended optical fiber is connected to a mooring at a first end of the suspended optical fiber and further includes at least one terminal end. The optical time-domain reflectometer includes a light source operable to emit an optical pulse of light into the suspended optical fiber from the origin location toward the terminal end, and a processor operable to receive an optical return signal from the terminal end of the suspended optical fiber or from a deformation created by a disturbance to the suspended optical fiber and to determine a location and a type of the disturbance based on an analysis of at least a time to receive the optical return signal and a magnitude of the optical return signal.

A flush and fill tool is configured for releasable mating engagement with a bulkhead mounted connector unit which has an optical contact chamber containing optical fluid. The unit has an outer shell with an open forward end containing a seal assembly designed for sealed engagement with a corresponding seal assembly at the forward end of the mating connector unit. An optical fluid fill reservoir and a capture reservoir for used optical fluid located in the housing are associated with a fill pin and a return pin, respectively, which extend through aligned bores in the seal assemblies into the optical contact chamber in the mated condition. A spring loaded plunger engaged in the fill reservoir injects optical fluid from the fill reservoir through a passageway through the fill pin and into the optical contact chamber, ejecting used oil from the chamber through a passageway in the return pin into the capture reservoir.

An Above Bottom Fiber (ABF) cable includes an elongated fiber cable having microspheres adhered to the ABF by an adhesive lightly coated to the outer surface of the ABF. The elongated fiber is negatively buoyant while the microspheres and adhesives are positively buoyant, resulting in the ABF being controllably buoyant in a fluid environment. Anchor lines with optional anchor weights are attached to the fiber cable periodically to prevent the fiber cable from drifting. The microspheres detach slowly from the fiber cable resulting in the ABF sinking. All components of the ABF are biodegradable.

A cable sealing device structurally configured to form a watertight seal where a communication cable is received through a pass-through port. The cable sealing device may include a housing portion structurally configured to mount onto the cable and a sealing member at least partially housed in an interior space of the housing portion. The sealing member being structurally configured to create a seal between the housing portion and the cable and/or between a first end portion of the housing portion and a surface surrounding the pass-through port to enhance simplicity of installation and sealing effectiveness of the sealing device.

This optical communication device (1) is provided with a plurality of light-receiving elements (11) and a plurality of optical fibers (12). The plurality of optical fibers each includes a light-incident end portion (12a) for communication light and a light-emission end portion (12b) for communication light. The plurality of light-emission end portions is each arranged near each of the plurality of light-receiving elements. The plurality of light-incident end portions is each configured to be capable of being arranged in a predetermined position in a predetermined direction.

To suppress expansion of damage to a working-state cable due to work being continued without detecting breakage of the working-state cable when the breakage occurs, the working-state cable protection monitoring system is provided with: a working means that moves or installs a wire cable-shaped construction material including an optical fiber having at least one core; an interrogator that acquires environment information about each position of the construction material, sensed by the optical fiber; and an abnormal event detection means that, when the environment information acquired at each position of the construction material satisfies an abnormal pattern, detects an abnormal event at the position, where in the working means stops movement and installment of the wire cable-shaped construction material when the abnormal event has been detected.

An undersea fiber optic cable architecture including a beach manhole (BMH) installed at a terrestrial site, a terrestrial station connected to the BMH by a terrestrial fiber optic cable, a first landing cable extending from the BMH into territorial waters adjacent the terrestrial site and connected to a first enhanced branching unit (EBU) located in the territorial waters, a second landing cable extending from the BMH into the territorial waters and connected to a second EBU located in the territorial waters, a recovery path cable connecting the first EBU to the second EBU, a first trunk cable extending from the first EBU into international waters, and a second trunk cable extending from the second EBU into the international waters.