Patents by Inventor Steven Alleston
Steven Alleston has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9209901Abstract: An optical transceiver performs dual mode operations in an optical network. The dual mode operations include a single-fiber mode, in which a single fiber connecting the optical transceiver and another network node carries bi-directional optical signals, and a dual-fiber mode, in which two fibers connecting the optical transceiver and another network node carry respective uni-directional optical signals in opposite directions. A switching module coupled to the optical transceiver is set in accordance with a control signal such that a transmitter module transmits and a receiver module receives via a first optical connector receptacle to enable the single-fiber mode, or such that the transmitter module transmits via the first optical connector receptacle and the receiver module receives via a second optical connector receptacle to enable the dual-fiber mode.Type: GrantFiled: November 20, 2012Date of Patent: December 8, 2015Assignee: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)Inventors: Stefan Dahlfort, Steven Alleston
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Patent number: 7738163Abstract: In an optical transmission system for transmission of data along an optical fiber link, a receiver for an optical supervisory channel is capable of detecting data at a lower rate at which a Raman pump is enabled, and at a higher rate which is commenced when the higher power of a Raman amplified signal has been received.Type: GrantFiled: January 29, 2004Date of Patent: June 15, 2010Assignee: Ericsson ABInventors: Stuart Bidmead, Steven Alleston, Anthony Walsh
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Patent number: 7734186Abstract: A method of reducing Raman tilt in a transmission apparatus capable of transmitting a plurality of signals, occupying contiguous channels in a transmission band, through a length of optical transmission cable which exhibits the Raman effect of transferring energy from the shorter wavelength signals at one end of the transmission band towards the longer wavelength signals at the other end of the transmission band, including the transmission of half the maximum number of signals at twice the normal channel frequency spacing at a higher-than-normal level and the transmission signals in selected ones, fewer than all, of the available channels at the normal channel spacing at a normal power level. As new channels are added at the lower frequency channel spacing, the powers of both neighboring channels are reduced to the normal power level.Type: GrantFiled: September 17, 2002Date of Patent: June 8, 2010Assignee: Ericsson ABInventors: Marc Francis Charles Stephens, Steven Alleston, Nicholas John Doran
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Patent number: 7447441Abstract: An apparatus and method of transmitting a plurality of polarized signals having different wavelengths through a length of signal transmission cable which changes the polarization of the signals in correspondence with their amplitudes and wavelengths. A dynamic filter capable of differential adjustment of the amplitudes of the signals and a polarizing element are provided in series with the length of signal transmission cable and the amplitudes of the different wavelength signals are so adjusted that the polarization states of the signals move towards alignment with the low-loss axis of the polarizing element. An advantage provided by the apparatus and method is that the high-amplitude signals are aligned with the low-loss axis of the polarizing element while low-amplitude noise is aligned with the high-loss axis of the polarizing element, resulting in an improvement in signal-to-noise ratio.Type: GrantFiled: November 27, 2002Date of Patent: November 4, 2008Assignee: Ericsson ABInventors: Steven Alleston, Paul Harper, Donald Govan, Nicholas John Doran
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Patent number: 7336906Abstract: An optical signal transmission apparatus for transmitting a plurality of data signals comprising a plurality of inputs for receiving a respective one of the data signals and delivering the respective data signal with a controlled phase and at a controlled data rate. A plurality of optical carrier signals having different wavelength is generated. Each of a plurality of first modulators is operative for modulating a respective one of the optical carriers with a respective data signal to provide a first-modulated optical carrier signal. An optical signal-routing device has a plurality of input ports, each port being for receiving a respective one of the first-modulated optical carrier signals and delivering it to the output port of the device.Type: GrantFiled: September 11, 2002Date of Patent: February 26, 2008Assignee: Ericsson ABInventors: Derek Nesset, Steven Alleston, Paul Harper, Benoit Charbonnier
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Patent number: 7174097Abstract: A method and apparatus for transmitting a plurality of signals having different wavelengths through a length of optical cable which is caused to provide distributed gain by being subjected to Raman pumping at a plurality of pump wavelengths, the power levels of the pump signals being in a set ratio or ratios for providing, preferably, a flat gain profile over the range of wavelengths of the plurality of signals, the set power levels of the pump signals being determined from the measured effects of the pump signals on a probe signal and in relation to the wavelength separations among the probe signal, the pump signals and the plurality of signals having different wavelengths.Type: GrantFiled: November 27, 2002Date of Patent: February 6, 2007Assignee: Ericsson ABInventors: Steven Alleston, Liam Gleeson, Tim Ellingham, Tony Walsh
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Publication number: 20060269287Abstract: In an optical transmission system for transmission of data along an optical fiber link, a receiver for an optical supervisory channel is capable of detecting data at a lower rate at which a Raman pump is enabled, and at a higher rate which is commenced when the higher power of a Raman amplified signal has been received.Type: ApplicationFiled: January 29, 2004Publication date: November 30, 2006Inventors: Stuart Bidmead, Steven Alleston, Anthony Walsh
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Publication number: 20050226632Abstract: An apparatus and method of transmitting a plurality of polarized signals having different wavelengths through a length of signal transmission cable which changes the polarization of the signals in correspondence with their amplitudes and wavelengths. A dynamic filter capable of differential adjustment of the amplitudes of the signals and a polarizing element are provided in series with the length of signal transmission cable and the amplitudes of the different wavelength signals are so adjusted that the polarization states of the signals move towards alignment with the low-loss axis of the polarizing element. An advantage provided by the apparatus and method is that the high-amplitude signals are aligned with the low-loss axis of the polarizing element while low-amplitude noise is aligned with the high-loss axis of the polarizing element, resulting in an improvement in signal-to-noise ratio.Type: ApplicationFiled: November 27, 2002Publication date: October 13, 2005Inventors: Steven Alleston, Paul Harper, Donald Govan, Nicholas Doran
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Publication number: 20050226638Abstract: An optical signal transmission apparatus for transmitting a plurality of data signals comprising a plurality of inputs for receiving a respective one of the data signals and delivering the respective data signal with a controlled phase and at a controlled data rate. A plurality of optical carrier signals having different wavelength is generated. Each of a plurality of first modulators is operative for modulating a respective one of the optical carriers with a respective data signal to provide a first-modulated optical carrier signal. An optical signal-routing device has a plurality of input ports, each port being for receiving a respective one of the first-modulated optical carrier signals and delivering it to the output port of the device.Type: ApplicationFiled: September 11, 2002Publication date: October 13, 2005Inventors: Derek Nesset, Steven Alleston, Paul Harper, Benoit Charbonnier
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Publication number: 20050128568Abstract: A method of reducing Raman tilt in a transmission apparatus capable of transmitting a plurality of signals, occupying contiguous channels in a transmission band, through a length of optical transmission cable which exhibits the Raman effect of transferring energy from the shorter wavelength signals at one end of the transmission band towards the longer wavelength signals at the other end of the transmission band, including the transmission of half the maximum number of signals at twice the normal channel frequency spacing at a higher-than-normal level and the transmission signals in selected ones, fewer than all, of the available channels at the normal channel spacing at a normal power level. As new channels are added at the lower frequency channel spacing, the powers of both neighboring channels are reduced to the normal power level.Type: ApplicationFiled: September 17, 2002Publication date: June 16, 2005Inventors: Marc Stephens, Steven Alleston, Nicholas Doran