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Frith
Gavin P. Frith, Wantirna South AU
| Patent application number | Description | Published |
|---|---|---|
| 20110075252 | OPTICAL FIBER LASERS AND AMPLIFIERS AND METHODS FOR PROVIDING OPTICAL GAIN - The present invention relates generally to devices for the generation and amplification of electromagnetic energy. The present invention relates more particularly to optical fiber devices, such as lasers and amplifiers, useful for generating and amplifying optical energy. Accordingly, one aspect of the present invention is an optical fiber device for providing optical gain at a selected wavelength, the optical fiber device comprising: one or more sources of optical pump energy; a first length of optical fiber having a core comprising a first cross-sectional region within which the concentration of a rare earth does not fall below 50% of its highest concentration; and a second length of optical fiber comprising a core comprising a first cross-sectional region within which the concentration of the rare earth does not fall below 50% of its highest concentration, wherein the intensity of optical pump energy is higher in the first length of optical fiber than in the second, and the first cross-sectional region of the core of the second length of optical fiber is larger in area than the first cross-sectional region of the core of the first length of optical fiber. | 03-31-2011 |
Gavin P. Frith, Bloomfield, CT US
| Patent application number | Description | Published |
|---|---|---|
| 20090080835 | OPTICAL FIBER LASER, AND COMPONENTS FOR AN OPTICAL FIBER LASER, HAVING REDUCED SUSCEPTIBILITY TO CATASTROPHIC FAILURE UNDER HIGH POWER OPERATION - Optical fiber lasers and components for optical fiber laser. An optical fiber laser can comprise a fiber laser cavity having a wavelength of operation at which the cavity provides output light, the cavity including optical fiber that guides light having the wavelength of operation, the fiber having first and second lengths, the first length having a core having a V-number at the wavelength of operation and a numerical aperture, the second length having a core that is multimode at the wavelength of operation and that has a V-number that is greater than the V-number of the core of the first length optical fiber at the wavelength of operation and a numerical aperture that is less than the numerical aperture of the core of the first length of optical fiber. At least one of the lengths comprises an active material that can provide light having the wavelength of operation via stimulated emission responsive to the optical fiber receiving pump light. Components include a mode field adapter and optical fiber interconnection apparatus, which can be used to couple the first and second lengths of optical fiber, or can couple the fiber laser to an optical fiber power amplifier, which can be a multimode or single mode amplifier. | 03-26-2009 |
Graeme Frith, Reading GB
| Patent application number | Description | Published |
|---|---|---|
| 20090074712 | Methods for Treatment and Prevention of Infection - Specific cytokines may be used as agents for the treatment and/or prevention of bacterial infection, by binding to components of the bacterial cell membrane and directly killing the bacteria. This finding has a number of applications in screening methods, vaccine production and clearance of bacterial components. | 03-19-2009 |
Martin A. Frith, Goleta, CA US
| Patent application number | Description | Published |
|---|---|---|
| 20080232746 | Medical light source and method - The present invention provides an apparatus and method for securing a light guide to a light source. The light guide has an end termination having a predetermined size and the light source has an opening with an axis for receiving the end termination. The opening is adaptable to receive and grip light guides of different sizes. In one aspect of the invention, an actuator is operable to expand and shrink the opening. In another aspect of the invention, one or more shields are provided to block light from exiting the light source except when a light guide is connected to the light source. | 09-25-2008 |
| 20090087149 | Medical light source and method - The present invention provides an apparatus and method for securing a light guide to a light source. The light guide has an end termination having a predetermined size and the light source has an opening with an axis for receiving the end termination. The opening is adaptable to receive and grip light guides of different sizes. In one aspect of the invention, an actuator is operable to expand and shrink the opening. In another aspect of the invention, one or more shields are provided to block light from exiting the light source except when a light guide is connected to the light source. | 04-02-2009 |
Peter J. Frith, Edinburgh GB
| Patent application number | Description | Published |
|---|---|---|
| 20090154733 | AMPLIFIER CIRCUIT AND METHODS OF OPERATION THEREOF - A signal amplifying circuit and associated methods and apparatuses, the circuit comprising: a signal path extending from an input terminal to an output terminal, a gain controller arranged to control the gain applied along the signal path in response to a control signal; an output stage within the signal path for generating the output signal, the output stage having a gain that is substantially independent of its supply voltage, and a variable voltage power supply comprising a charge pump for providing positive and negative output voltages, the charge pump comprising a network of switches that is operable in a number of different states and a controller for operating the switches in a sequence of the states so as to generate positive and negative output voltages together spanning a voltage approximately equal to the input voltage. | 06-18-2009 |
| 20090212859 | AMPLIFIER CIRCUIT AND METHODS OF OPERATION THEREOF - A signal amplifying circuit and associated methods and apparatuses, the circuit comprising: a signal path extending from an input terminal to an output terminal, a gain controller arranged to control the gain applied along the signal path in response to a control signal; an output stage within the signal path for generating the output signal, the output stage having a gain that is substantially independent of its supply voltage, and a variable voltage power supply comprising a charge pump for providing positive and negative output voltages, the charge pump comprising a network of switches that is operable in a number of different states and a controller for operating the switches in a sequence of the states so as to generate positive and negative output voltages together spanning a voltage approximately equal to the input voltage. | 08-27-2009 |
| 20100194479 | AMPLIFIER CIRCUIT AND METHODS OF OPERATION THEREOF - A signal amplifying circuit and associated methods and apparatuses, the circuit comprising: a signal path extending from an input terminal to an output terminal, a gain controller arranged to control the gain applied along the signal path in response to a control signal; an output stage within the signal path for generating the output signal, the output stage having a gain that is substantially independent of its supply voltage, and a variable voltage power supply comprising a charge pump for providing positive and negative output voltages, the charge pump comprising a network of switches that is operable in a number of different states and a controller for operating the switches in a sequence of the states so as to generate positive and negative output voltages together spanning a voltage approximately equal to the input voltage. | 08-05-2010 |
| 20110103619 | AMPLIFIER CIRCUIT AND METHODS OF OPERATION THEREOF - A signal amplifying circuit and associated methods and apparatuses, the circuit comprising: a signal path extending from an input terminal to an output terminal, a gain controller arranged to control the gain applied along the signal path in response to a control signal; an output stage within the signal path for generating the output signal, the output stage having a gain that is substantially independent of its supply voltage, and a variable voltage power supply comprising a charge pump for providing positive and negative output voltages, the charge pump comprising a network of switches that is operable in a number of different states and a controller for operating the switches in a sequence of the states so as to generate positive and negative output voltages together spanning a voltage approximately equal to the input voltage. | 05-05-2011 |
| 20110115563 | AMPLIFIER CIRCUIT AND METHODS OF OPERATION THEREOF - A signal amplifying circuit and associated methods and apparatuses, the circuit comprising: a signal path extending from an input terminal to an output terminal, a gain controller arranged to control the gain applied along the signal path in response to a control signal; an output stage within the signal path for generating the output signal, the output stage having a gain that is substantially independent of its supply voltage, and a variable voltage power supply comprising a charge pump for providing positive and negative output voltages, the charge pump comprising a network of switches that is operable in a number of different states and a controller for operating the switches in a sequence of the states so as to generate positive and negative output voltages together spanning a voltage approximately equal to the input voltage. | 05-19-2011 |
| 20110235827 | AMPLIFIER CIRCUIT AND METHODS OF OPERATION THEREOF - A signal amplifying circuit and associated methods and apparatuses, the circuit comprising: a signal path extending from an input terminal to an output terminal, a gain controller arranged to control the gain applied along the signal path in response to a control signal; an output stage within the signal path for generating the output signal, the output stage having a gain that is substantially independent of its supply voltage, and a variable voltage power supply comprising a charge pump for providing positive and negative output voltages, the charge pump comprising a network of switches that is operable in a number of different states and a controller for operating the switches in a sequence of the states so as to generate positive and negative output voltages together spanning a voltage approximately equal to the input voltage. | 09-29-2011 |
Peter John Frith, Edinburgh GB
| Patent application number | Description | Published |
|---|---|---|
| 20110276975 | AUDIO DEVICE - An audio device is provided that is arranged for communication of data and signalling with a controller, signalling from the device to the controller being made in discrete time slots, the device comprising: a plurality of nodes, each assigned a priority value and each having one or more unsolicited response sources capable of generating an unsolicited response for transmission to the controller, wherein unsolicited responses generated from a particular node are assigned the priority value of that node; and unsolicited response management means operable to hold unsolicited responses generated by the plurality of nodes that are awaiting transmission to the controller, wherein when two or more unsolicited responses are awaiting transmission to the controller in the unsolicited response management means, the device is arranged to transmit the unsolicited response with the highest assigned priority value first, in the next free time slot. | 11-10-2011 |
Railton Frith, Buckinghamshire GB
| Patent application number | Description | Published |
|---|---|---|
| 20090078024 | PARTICLE DETECTOR - A particle detector ( | 03-26-2009 |
William James Frith, Sharnbrook GB
| Patent application number | Description | Published |
|---|---|---|
| 20080292705 | Emulsifier system - The invention relates to an emulsifier system, which comprises a nanoparticle with a positive or negative net charge and a hydrophobic compound of opposite charge to the nanoparticle that will bind to the nanoparticle making it hydrophobic and the use of that system for preparing water-in-oil (WIO) emulsions as well as oil-in-water (O/W) emulsions. | 11-27-2008 |