Abstract: Methods and systems for improved inspection, measurements, mapping, monitoring, and trending of underwater infrastructure that contains or are located in fluids, and/or that is difficult to access. The methods and systems include a housing containing a light source, a hollow core motor, a reflector, and a pressure tolerant window. The light source is disposed to pass output light along a path that passes through an axis of rotation of the hollow core motor to the reflector. The reflector rotates about the axis of rotation of the motor and operates to reflect the light at an angle to the rotation axis. In at least some embodiments, the light is passed through a full 360 degrees about the axis of rotation. The described methods and devices utilize one or more non-touch underwater optical system (including laser systems) for underwater equipment and infrastructure inspection, measurements, mapping, monitoring, trending, and maintenance.

Abstract: A handheld relaxation device includes a nut and bolt that is configured to fit in a user's hand and help relieve stress in adults and children.

Abstract: The present invention relates to an integral antiseismic door frame or seismic shock dissipation door frame adaptable to climate changes, which controls movements for all types of vertical or horizontal communicational involvement on foot within a dwelling, either house or building for general use. The door frame is composed of a plurality of components having different geometrical shapes, masses, densities and elasticities, joined together to form an energy dissipater or force damper in an integral frame comprising one or more multidirectional energy dissipaters which are assembled perpendicularly thereto. During installation it can be adapted to variations in the parallelism of the side and top walls when anchoring thereto due to other elements made either of wood, plastic, iron or the like, which are installed lengthwise to increase its width and correct the parallelism of the walls, if necessary, without altering its energy dissipation properties.

Abstract: Methods for controlling lost circulation in subterranean wells, and in particular, fluid compositions and methods for operations during which the fluid compositions are pumped into a wellbore, enter voids in the subterranean-well formation through which wellbore fluids escape, and form a seal that limits further egress of wellbore fluid from the wellbore. The methods include preparing a carrier fluid containing compressed expandable foam that may be encapsulated. The carrier fluid is then placed into a lost-circulation zone, whereupon the foam expands to form a barrier that minimizes or blocks further ingress of carrier fluid. Lost-circulation control may be supplemented by introducing additional lost-circulation materials, pumping a cement slurry behind the foam-containing carrier fluid or both.

Abstract: Methods for controlling lost circulation in subterranean wells, and in particular, fluid compositions and methods for operations during which the fluid compositions are pumped into a wellbore, enter voids in the subterranean-well formation through which wellbore fluids escape, and form a seal that limits further egress of wellbore fluid from the wellbore. The methods include preparing a carrier fluid containing compressed expandable foam that may be encapsulated. The carrier fluid is then placed into a lost-circulation zone, whereupon the foam expands to form a barrier that minimizes or blocks further ingress of carrier fluid. Lost-circulation control may be supplemented by introducing additional lost-circulation materials, pumping a cement slurry behind the foam-containing carrier fluid or both.

Abstract: A transmitter in a fiber optic system is provided, including a driver circuit, a light emitting source, and transmission lines. The driver circuit is configured to receive a modulated electrical signal and to have a driver circuit output impedance. The light emitting source has a light emitter impedance that is different than the driver circuit output impedance. The light emitting source is configured to receive the modulated electrical signal such that it produces a modulated optical signal proportional to modulated electrical signal. The transmission lines are coupled between the driver circuit and the light emitting source for transmitting the modulated electrical signal from the driver circuit to the light emitting source. The transmission lines gradually change the impedance between the driver circuit and the light emitting source so as to gradually match the driver circuit output impedance to the light emitter impedance.

Abstract: A laser driver comprises a PNP transistor current source, an inductor coupled to the PNP transistor current source, a switch coupled to the inductor, and a current sink coupled to the switch. The PNP transistor current source supplies a first current to a laser if the switch is closed and a second current to the laser if the switch is open. The PNP transistor current source, inductor, switch, and current sink are on a single semiconductor chip.

Abstract: A method and apparatus for driving lasers. An example laser driving system includes a laser current controller for providing a modulation signal and a bias signal. The modulation signal and bias signal is used by a plurality of high-speed current drivers that accept the modulation signal and the bias signal and produce a plurality of laser drive signals. The example system also has a disable input that disconnects power from a high-speed current driver when the high-speed current driver is not in use. The exemplary system develops the modulation and bias signals by feeding back a signal developed from detection of laser light from one of the lasers driven by the system. The laser may be a data laser or a control laser that is modulated by a signal having a lower frequency than the data lasers. If a control laser is used then the photodetector circuit used for feedback can have a lower frequency response because of the lower frequency of the control laser signal.

Abstract: A temperature compensation system comprises a laser driver having a first potentiometer, the laser driver configured to provide a first signal to a laser based on a value of the first potentiometer and an optical communication analyzer configured to provide a second signal indicative of a first output parameter of the laser. The temperature compensation system comprises a computer system configured to drive the first signal and receive the second signal and determine a first updated value for the first potentiometer to obtain a first desired laser output parameter value based on a first known value of the first potentiometer, the second signal, and the first desired laser output parameter value.

Abstract: An optical transceiver includes a chassis, a printed circuit board, a conducting strip, a cover and a gasket. The chassis has a first reference. The printed circuit board has a second reference. The conducting strip is adjacent the printed circuit board and the cover is coupled over the printed circuit board. The gasket is positioned between the conducting strip and the cover thereby capacitive coupling the first reference to the second reference.

Abstract: An optical transceiver includes a housing, a circuit board, an optical subassembly and a decoupling disk. The circuit board is configured to be coupled within the housing. The optical subassembly has a can and a barrel and the optical subassembly is coupled within the housing. The decoupling disk is coupled to the can of the optical subassembly.

Abstract: An optical transceiver includes a chassis, a printed circuit board, a conducting strip, a cover and a gasket. The chassis has a first reference. The printed circuit board has a second reference. The conducting strip is adjacent the printed circuit board and the cover is coupled over the printed circuit board. The gasket is positioned between the conducting strip and the cover thereby capacitive coupling the first reference to the second reference.

Abstract: An optical transceiver includes a housing, a circuit board, an optical subassembly and a decoupling disk. The circuit board is configured to be coupled within the housing. The optical subassembly has a can and a barrel and the optical subassembly is coupled within the housing. The decoupling disk is coupled to the can of the optical subassembly.

Abstract: A method and apparatus for driving lasers. An example laser driving system includes a laser current controller for providing a modulation signal and a bias signal. The modulation signal and bias signal is used by a plurality of high-speed current drivers that accept the modulation signal and the bias signal and produce a plurality of laser drive signals. The example system also has a disable input that disconnects power from a high-speed current driver when the high-speed current driver is not in use. The exemplary system develops the modulation and bias signals by feeding back a signal developed from detection of laser light from one of the lasers driven by the system. The laser may be a data laser or a control laser that is modulated by a signal having a lower frequency than the data lasers. If a control laser is used then the photodetector circuit used for feedback can have a lower frequency response because of the lower frequency of the control laser signal.

Abstract: An optical communication system that includes a multi-channel post amplifier assembly with flexible output configurations for amplifying optical-to-electrical converted signals on selectable groups of amplifier channels is provided. The post amplifier assembly, when implemented on a single IC chip, is capable of operating with either the 2.5V or 3.3V of power supply. In addition, the IC chip containing the post amplifier assembly provides capability to selectively turn off one or more post amplifier channels during operation. Further, the post amplifiers provide integral auto zero function without requiring a use of external capacitors.

Abstract: A method and apparatus for driving lasers. An example laser driving system includes a laser current controller for providing a modulation signal and a bias signal. The modulation signal and bias signal is used by a plurality of high-speed current drivers that accept the modulation signal and the bias signal and produce a plurality of laser drive signals. The example system also has a disable input that disconnects power from a high-speed current driver when the high-speed current driver is not in use. The exemplary system develops the modulation and bias signals by feeding back a signal developed from detection of laser light from one of the lasers driven by the system. The laser may be a data laser or a control laser that is modulated by a signal having a lower frequency than the data lasers. If a control laser is used then the photodetector circuit used for feedback can have a lower frequency response because of the lower frequency of the control laser signal.

Abstract: A temperature compensation system comprises a laser driver having a first potentiometer, the laser driver configured to provide a first signal to a laser based on a value of the first potentiometer and an optical communication analyzer configured to provide a second signal indicative of a first output parameter of the laser. The temperature compensation system comprises a computer system configured to drive the first signal and receive the second signal and determine a first updated value for the first potentiometer to obtain a first desired laser output parameter value based on a first known value of the first potentiometer, the second signal, and the first desired laser output parameter value.

Abstract: A laser driver comprises a PNP transistor current source, an inductor coupled to the PNP transistor current source, a switch coupled to the inductor, and a current sink coupled to the switch. The PNP transistor current source supplies a first current to a laser if the switch is closed and a second current to the laser if the switch is open. The PNP transistor current source, inductor, switch, and current sink are on a single semiconductor chip.

Abstract: An optical communication system that includes a multi-channel post amplifier assembly with flexible output configurations for amplifying optical-to-electrical converted signals on selectable groups of amplifier channels is provided. The post amplifier assembly, when implemented on a single IC chip, is capable of operating with either the 2.5V or 3.3V of power supply. In addition, the IC chip containing the post amplifier assembly provides capability to selectively turn off one or more post amplifier channels during operation. Further, the post amplifiers provide integral auto zero function without requiring a use of external capacitors.

Abstract: A receiver in a fiber optic system including an optical detector, an electronic circuit and an adjustment input circuit. The optical detector is configured to receive optical signals of varying light intensity. The optical detector has a dynamic range of sensitivity between a high optical intensity value and a low optical intensity value. The optical detector is also configured to convert the received optical signals into analog electrical signals proportional to the optical intensity of the optical signals. The electronic circuit is coupled to the optical detector and it is configured to receive the analog electrical signals from the optical detector. The electronic circuit also produces digital signals representative of the optical intensity of the optical signals such that the electronic circuit is configured with an original maximum digital value proportional to the high optical intensity value and an original minimum digital value proportional to the low optical intensity value.