Paul Townsend
Paul Townsend, Classes Lake IE
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20110019823 | OPTICAL COMMUNICATION SYSTEM AND METHOD FOR SECURE DATA COMMUNICATION USING QUANTUM KEY DISTRIBUTION - The invention provides time-synchronised transmission of data on the (polarisation or phase-modulated) QKD channel and the (on-off modulated) conventional channel such that a QKD bit is only transmitted when a zero, or sequence of zeros, is transmitted on the conventional channel. Also, there is co-directional propagation of the QKD and conventional channel. Further, there is dispersion management through wavelength selection or control of fibre properties or other means such that the “walk-off in time of the QKD pulses and the Raman pulses generated by the ones on the conventional channel is less than or of the order of one bit period. The latter can be achieved, for example, by placing the conventional and QKD channel wavelengths close to the point where the group velocity-induced time delay for optical pulses propagating in the fibre reaches a minimum. This dispersion minimum occurs at a wavelength of 1.3 microns in standard fibre. The invention discloses a receiver embodiment to implement the invention. | 01-27-2011 |
Paul Townsend, Northumberland GB
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20100282261 | TWO-PART STRUCTURAL SUPPORT MEMBER FOR A HARNESS FOR BREATHING APPARATUS - The present invention relates to a structural support member | 11-11-2010 |
20100282791 | STRUCTURAL SUPPORT MEMBER FOR A HARNESS FOR BREATHING APPARATUS - A structural support member | 11-11-2010 |
20100282793 | Gas-Cylinder Retaining Assembly - The present invention relates to a gas-cylinder retaining assembly | 11-11-2010 |
20100282795 | Clip for Use with Breathing Apparatus - The present invention relates to a clip | 11-11-2010 |
20100282796 | Flexible Strap - The present invention relates to a strap | 11-11-2010 |
20100282797 | SHOULDER STRAP - A shoulder strap for a harness for breathing apparatus includes a first elongate strap portion generally extending along a first longitudinal axis; a second elongate strap portion attached to the first strap portion and generally extending along a second longitudinal axis that is oblique to the first axis; and a first attachment portion for attaching a first end of the shoulder strap to the harness in use and a second attachment portion for attaching a second end of the shoulder strap to the harness in use. | 11-11-2010 |
20100282806 | Harness for Breathing Apparatus - The present invention relates to a harness | 11-11-2010 |
20120260919 | DIAPHRAGM - A diaphragm for a lung demand valve, including a chemical, biological, radiological and/or nuclear (CBRN) layer which is sufficiently resistant to the permeation of at least some CBRN agents and a resilient layer which is resiliently deformable. The CRBN layer is arranged to restrict the permeation of at least some CBRN agents through the diaphragm, and the resilient layer is arranged to allow the diaphragm to be resiliently deformed. | 10-18-2012 |
Paul Townsend, Newcastle Upon Tyne GB
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20100147306 | BREATHING APPARATUS - A face mask ( | 06-17-2010 |
20100200624 | Harnesses - A harness for use with breathing apparatus has: a flexible hip plate | 08-12-2010 |
Paul Townsend, Cork IE
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20100111543 | OPTICAL COMMUNICATION SYSTEM - An optical transmitter is of the reflective modulation type and has a means of generating reflection, a mixer for mixing a data stream and a sub-carrier, and an optical modulator for modulating an optical carrier with the output from the mixer in order to avoid optical beat-interference noise arising from, for example, Rayleigh backscattering. The modulator is in one embodiment of the interferometric type such as a Mach-Zehnder Modulator (MZM) operated to suppress the optical carrier at the transmitter output in order to reduce optical beat interference noise. The modulator preferably implements CSS-AMPSK modulation, which suppresses optical beat noise and achieves strong dispersion tolerance, enabling, for example, 10 Gb/s data transmission over 100 km distance without dispersion compensation. The transmitter may have a duobinary encoder, which encodes the data prior to mixing with the sub-carrier. | 05-06-2010 |
Paul Townsend, County Cork IE
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20110116808 | REFLECTIVE OPTICAL TRANSMITTER - A semiconductor optical amplifier (SOA) is used in a double pass configuration with one of the output ports followed by an attenuator, which is followed by a modulator with a reflective facet. The variable loss between the SOA and the modulator is optimised, so that the SOA can be operated in a highly saturated regime without distorting the modulated signal. The SOA is firstly saturated by the input carrier, ( | 05-19-2011 |
Paul Townsend, Ovens Co. Cork IE
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20130121707 | LINEAR BURST MODE RECEIVER - The invention provides a linear burst mode receiver comprising a first amplifier connected to a photodiode adapted to detect an optical input burst signal, a second amplifier connected to said photodiode; and means for deriving the peak input current of the detected burst signal using said second amplifier. The invention further provides means for using the derived peak input current to adjust the gain of the first amplifier during the preamble of each burst, such that the output voltage swing of the first amplifier equals a given reference, independent of the strength of the optical input burst signal. The usage of the fast feed-forward automatic gain control mechanism solves the problems with gain switching and non-linearity prevalent in today's burst-mode receivers. | 05-16-2013 |
Paul Townsend, Cramlington (northumberland) GB
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20140069427 | HARNESS FOR BREATHING APPARATUS - There is disclosed a harness for breathing apparatus which is arranged to support a plurality of cylinders of breathable gas side-by-side and is arranged to be worn on the back of a wearer. The harness comprises upper and lower longitudinally spaced housings coupled together by a longitudinally extending back member. The upper and lower housings are arranged to retain upper and lower portions of each cylinder respectively. | 03-13-2014 |