Abstract: An apparatus for subsea environment sensing. In one aspect, the apparatus may include a repeater assembly, disposed in an optical repeater; and an environmental sensor assembly, disposed proximate to the repeater assembly, the environmental sensor assembly being coupled to receive power from the repeater assembly over an optical link.

Abstract: An apparatus for subsea environment sensing. In one aspect, the apparatus may include a repeater assembly, disposed in an optical repeater; and an environmental sensor assembly, disposed proximate to the repeater assembly, the environmental sensor assembly being coupled to receive power from the repeater assembly over an optical link.

Abstract: A distributed acoustic sensing system. The DAS system may include a distributed acoustic sensing (DAS) station, comprising: a DAS transmitter, arranged to launch an outbound DAS signal through an optical fiber, over at least one span; a DAS receiver, arranged to receive a backscatter Rayleigh signal, based upon the DAS signal; and at least one component, coupled to the DAS transmitter, the DAS receiver, or both, and arranged to increase a sensitivity for sensing of the DAS system.

Abstract: A system may include a distributed acoustic sensing (DAS) station, comprising a DAS transmitter to launch an outbound DAS signal in a first direction, over at least one span of an optical communications link. The system may further include a DAS receiver to receive a backscattered Rayleigh signal, based upon the outbound DAS signal, wherein the DAS signal is transmitted at least in part over a D? fiber.

Abstract: A sensing system may include a distributed acoustic sensing (DAS) station to launch a DAS signal as an outbound DAS signal, as well as a plurality of DAS loopback assemblies, arranged along a plurality of spans. The plurality of DAS loopback assemblies may be arranged to separately process the outbound DAS signal, and return to the DAS station, the outbound DAS signal, as a return DAS signal that comprises a backscattered Rayleigh signal. As such, a given DAS loopback assembly of the plurality of DAS loopback assemblies may include an Erbium-Doped Fiber Amplifier (EDFA) that is arranged to compensate the loss from Rayleigh scattering of the DAS signal, and a filter device having an optical filtering function that is arranged to selectively send back just a sensing wavelength of the DAS signal.

Abstract: This application describes techniques for testing fiber optic telecommunication systems, such as undersea fiber optic cable systems. Testing terminals may be deployed at a location of terminating equipment for a fiber optic cable. The testing terminals may be operated remotely. The testing terminals may be configured to programmatically test the cable by loading one or more tests and automatically configure the cable's transmitters and receivers based on predetermined loading schemes selected based on the tests to be performed. The testing terminals may iterate over channels and fiber pairs of the cable and may use back-to-back tests to remove artifacts from test results. Using the described techniques, a cable's channels and fiber pairs can be fully characterized in the amount of time afforded for a typical testing schedule, which was not generally possible using conventional testing.

Abstract: The position and amount of localized polarization dependent anomalies such as polarization mode dispersion and/or polarization dependent loss may be measured by applying a polarization modulated probe signal to an optical transmission line. The polarization modulated probe signal is returned via optical feedback paths positioned along the line, and is detected by a probe signal receiver to identify the position and strength of the anomaly.

Abstract: The position and amount of localized polarization dependent anomalies such as polarization mode dispersion and/or polarization dependent loss may be measured by applying a polarization modulated probe signal to an optical transmission line. The polarization modulated probe signal is returned via optical feedback paths positioned along the line, and is detected by a probe signal receiver to identify the position and strength of the anomaly.

Abstract: A load binder or lashing tightener is provided made up of a first inner elongate sleeve member closed at one end, an anchor fitting on said closed end, a thread nut in the other end of said first sleeve, a second outer sleeve having one end adapted to telescope over the first inner sleeve, an anchor member on said second sleeve adjacent the other end, an elongate screw extending through the second sleeve, one end threadingly engaging the nut in said first sleeve, the other end rotatably fixed in the said other end of said second sleeve, a drive on said other end for rotating said screw whereby said second sleeve is caused to telescope over the first sleeve and the anchors on said sleeves are brought together and an anchor member at the said one end of said second sleeve adapted to receive the lashing to be tightened after the sleeves have been telescoped. The drive may be a hand knob protected by a spacer ring on the second sleeve.

Abstract: A load binder or lashing tightener is provided made up of a first inner elongate sleeve member closed at one end, an anchor fitting on said closed end, a thread nut in the other end of said first sleeve, a second outer sleeve having one end adapted to telescope over the first inner sleeve, anchor means on said second sleeve adjacent said one end, screw means extending through the second sleeve, one end threadingly engaging the nut in said first sleeve, the other end rotatably fixed in the said other end of said second sleeve and hand wheel drive means on said other end for rotating said screw whereby said second sleeve is caused to telescope over the first sleeve and the anchor means on said sleeves are brought together.

Abstract: A movable bulkhead or cargo restraint assembly is provided for cargo space such as a railway car, truck bed, boat hold or the like in the form of a plurality of spaced apart elongated strands fixed at one end to a confining wall of a cargo space, said strands being spaced apart around a cargo to be restrained, bulkhead device movable on said elongated strands lengthwise thereof to contact the cargo to be restrained, and a clamp device adjustable on each strand bearing against said bulkhead device engaging said strand to restrain said bulkhead against movement away from the cargo and releasing the strand on movement in the opposite direction whereby said clamp is adjusted to tightly hold the bulkhead device against said cargo.

Abstract: A load binder or lashing tightener is provided made up of a first inner elongate sleeve member closed at one end, an anchor fitting on said closed end, a thread nut in the other end of said first sleeve, a second outer sleeve having one end adapted to telescope over the first inner sleeve, anchor means on said second sleeve adjacent the other end, screw means extending through the second sleeve, one end threadingly engaging the nut in said first sleeve, the other end rotatably fixed in the said other end of said second sleeve and drive means on said other end for rotating said screw whereby said second sleeve is caused to telescope over the first sleeve and the anchor means on said sleeves are brought together.

Abstract: A connector for barges and the like is provided in the form of a threaded ratchet tube, a central ratchet drive for rotating said tube, an annular drive wheel surrounding and connected to said tube for rotating the same, separate right and left hand threaded screw members having one end threaded into said tube, fastening means on the other end of each said screw members and removable anchor means adapted to engage a surface over which the ratchet tube extends engaging one of said fastening means and holding said tube above said surface a distance greater than the radius of said annular drive wheel.

Abstract: A permanent rigging pedestal for barges and the like in the form of a base, a pair of spaced apart generally parallel vertical posts fixed at one end to the base, a gusset plate connecting the posts, a vertically extending coaxial pin fixed above each post, each pin adapted to receive the eyebolts of one or more ratchet turnbuckles and a locking bar connecting the pins at their upper ends to prevent removal of the turnbuckle eyebolts. In the preferred embodiment each pin carries a pair of ratchet turnbuckles, one ratchet turnbuckle having a pair of spaced eyebolts forming a U-shaped clevis between which the eyebolt of the other ratchet turnbuckle fits to engage the pin.

Abstract: The specification discloses various embodiments of apparatus adapted to function as convertible wire rope load binders, container lashing or pullers. All embodiments utilize a wire rope clamp of the type which grips the wire rope on tensioning of the wire rope, and a threaded tubular extension coaxial with the rope pass line, in combination with a slack take-up device, which may be any of a variety of slack take-up devices threaded onto the tubular extension. A preferred embodiment employs a slack take-up device in the form of an over-center or toggle lever and a sheave device attached to the body of the clamp. Another embodiment employs a combined hook and clevis device having a screw connection to the body of the clamp. Another embodiment utilizes a winch device on the tensioning end of the wire rope to provide for tensioning the wire rope.