Abstract: Apparatus, systems, and methods are used for activating a downhole tool, powered by an exothermic reaction, for operation, while deploying a tubing string from a wellbore surface. The tubing string comprises a coupling for enabling pressurized activation of the downhole tool, which comprises a fuel (e.g., thermite) for producing the exothermic reaction. The coupling enables fluid to flow into an interior of the coupling through a first flow passage, during descent of the downhole tool. A stopper is dropped and/or seated to cause the coupling interior to pressurize to an activation pressure, which causes an activator to activate a burn within the downhole tool. Once the downhole tool completes its operation, the coupling interior is further pressurized to burst a burst disc, which opens a second flow passage for fluid to flow from the interior to exterior of the coupling, while downhole tool and coupling are raised to the surface.

Abstract: Devices, systems, and methods for explosion resistance include an explosion-resistant enclosure and a lid assembly. The lid assembly includes a lid for enclosing an opening of the explosion-resistant enclosure, and a graphical display assembly for presenting visual information regarding the analysis equipment.

Abstract: Provided is a tool that includes a handle assembly including a top portion and a bottom portion. The tool also includes a lock plate disposed between the top and bottom portions and having a deflectable arm having a free end biased towards the top portion, a fixed end opposite the free end, an inner edge, an outer edge, and a detent near the free end and the inner edge. The tool additionally includes a blade having first and second ends, an indent in a bottom surface of the blade near the first end for engaging the detent in a closed position, and a ramp on the bottom surface near the indent defining a reduced thickness portion of the blade that reduces in thickness from the indent towards an edge of the blade to reduce contact between the detent and the blade during rotation of the blade.

Abstract: An application security monitors data traffic from computing devices to a remote application in a first computing environment, such as a production service chain. The application security monitor detects an anomaly in the data traffic from a computing device. Based on the anomaly, the remote application is substantially reproduced in a second computing environment, such as a scrubbing environment. The application security monitor redirects the anomalous data to the remote application in the second computing environment. The application security monitor determines whether the data traffic from the first computing device corresponds to malicious activity or legitimate activity by the computing device. Responsive to a determination that the data traffic from the first computing device corresponds to legitimate activity, the application security monitor applies to the first computing environment any changes in the second computing environment caused by the redirected traffic from the computing device.

Abstract: An optical filter is formed from at least two grating located in a waveguide region of a semiconductor optical device. Each grating has a multiple peak optical passband. The gratings are spaced apart in the waveguide region and form an optical cavity having a comb-filter characteristic. The gratings may be located in the active region of an optical gain element and in a preferred example are superstructure gratings (SSGs). A number of filters may be joined together in series.

Abstract: A semiconductor optical device, for example a laser, has a composite optical waveguide including a tapered, MQW active waveguide in optical contact with a substantially planar, passive waveguide. The fundamental optical mode supported by the composite waveguide varies along the length of the composite waveguide so that, in a laser, the laser mode is enlarged and is a better match to single mode optical fibre. A method for making such semiconductor optical devices is also disclosed.

Abstract: A semiconductor optical device, for example a laser, has a composite optical waveguide including a tapered, MQW active waveguide in optical contact with a substantially planar, passive waveguide. The fundamental optical mode supported by the composite waveguide varies along the length of the composite waveguide so that, in a laser, the laser mode is enlarged and is a better match to single mode optical fiber. A method for making such semiconductor optical devices is also disclosed.

Abstract: An optical filter is formed from at least two gratings (102,103) located in a waveguide region (104) of a` semiconductor optical device (101). Each grating has a multiple peak optical passband. The gratings are spaced apart in the waveguide region and form an optical cavity having a comb-filter characteristic. The gratings may be located in the active region of an optical gain element and in a preferred example are superstructure gratings (SSGs). A number of filters may be joined together in series.

Abstract: In a high speed optical clock extraction arrangement, an incoming digital signal is divided between two paths (11, 25). The signal on one path (25) is fed direct to a receiver (203), while the signal on the other path (11) is fed to a non-linear optical amplifier (1) which has separate gain and absorbing regions. The non-linear optical amplifier (1) is triggered by the incoming signal to pulsate at a clock frequency contained in the signal, and the resultant strong output clock signal is coupled into the path (25) carrying the incoming signal to the receiver (203). The non-linear optical amplifier (1) can provide a very high frequency clock output as a result of selective modification of the carrier lifetime.

Abstract: A semiconductor optical switching device comprises a passive optical input stage, a matrix stage and a passive optical output stage. The matrix stage incorporates active amplifiers, the switch as a whole being therefore part passive and part active. Control over the switching configuration is provided by electrical inputs to the amplifiers. The matrix stage guides optical signals in a direction transverse to optical signals propagating in the input or output stages. With this configuration, fixed change in direction of the optical paths available to optical signals propagating through the device are provided by splitters, combiners and total internal reflection mirrors.

Abstract: An avalanche photodiode having a beryllium guard ring. The beryllium is implanted at a dosage of at least 5.times.10.sup.14 per cm.sup.2 and subsequently annealed to provide a guard ring profile with a p+core and a superlinearly graded tail. The doping profile of the guard ring immediately adjacent the core is superlogarithmic.

Abstract: An opto-electronic device, comprising an optical waveguide and means for imposing an electrical field in a direction transverse to the waveguide, is designed such that the spatial spread of the electrical field is very small. The electrical field overlies the region of peak amplitude of the profile of optical radiation in the waveguide. Constructed principally out of semiconductor materials made from elements selected from the III and V groups of the Periodic Table, the device lends itself to monolithic integration in optical communications systems.

Abstract: An optical waveguide device, suitable for coupling to optical fibers, provides a combination of narrow optical confinement and small changes in refractive index along a first axis, with broad optical confinement and large changes in refractive index along a second, perpendicular axis. A rib waveguide in which a single transverse mode beam can propagate, comprises a thin guiding layer 2 sandwiched between a pair of relatively thick confining layers 1, 3 of refractive index only slightly less than that of the guiding layer 2. The rib is etched through both the upper confining layer 3 and the guiding layer 2 and is exposed at its sides and top to air.