Patents by Inventor George A. Cunningham
George A. Cunningham 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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Publication number: 20240137129Abstract: Techniques for driving a directly modulated laser whilst correcting non-linearities an optical output waveform, based on generating a modulating current waveform that approximates an ideal modulating current that produces a linear optical output waveform. The techniques enable useful, practical approximations to the ideal modulating current to be determined.Type: ApplicationFiled: January 25, 2022Publication date: April 25, 2024Inventors: Nikolaos Bamiedakis, David George Cunningham, Richard Vincent Penty
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Publication number: 20240126267Abstract: A mobile robot can include a first laser scanner and a second laser scanner. The robot position can be compared to a designated area to determine whether the robot is inside the designated area. One of the first laser scanner or the second laser scanner can be selected to use for localization based at least on whether the robot is inside the designated area. A laser scan can be performed using the selected one of the first laser scanner or the second laser scanner to provide laser scan information. The laser scan information can be compared to a mapping of an area around the robot to determine a location of the robot.Type: ApplicationFiled: October 5, 2023Publication date: April 18, 2024Inventors: George Vikram Paul, Kathleen Cunningham
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Publication number: 20120251105Abstract: A method and an apparatus are provided for launching light into an entrance facet of a MMF of an optical MMF link in a way that excites one or more targeted higher-order mode groups in the MMF. The light is launched into the entrance facet of the MMF as a line of phase-modulated spots, referred to herein as a “line launch”. The line launch causes one or more targeted higher-order mode groups to be excited in the MMF. The use of the line launch to excite one or more higher-order mode groups in the MMF increases the bandwidth of the link and allows overall link lengths to be increased. In addition, the use of the line launch is reliable and robust despite defects in the MMF and despite connector offsets. Thus, the use of the line launch ensures that a sufficient increase in link bandwidth will be achieved despite the existence of defects in the MMF and even if there is some amount of optical misalignment due to the connector being offset relative to the corresponding receptacle.Type: ApplicationFiled: March 19, 2010Publication date: October 4, 2012Applicant: CAMBRIDGE ENTERPRISE LIMITEDInventors: Chi Hang Kwok, Ian Hugh White, Richard Vincent Penty, David George Cunningham
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Patent number: 7715669Abstract: A fiber optic link is provided that uses a relatively low-cost transceiver that incorporates relatively inexpensive low bandwidth optical and electrical components to achieve high data rate operations. The data rate of the fiber optic link can be greater than the data rate of the laser of the transceiver provided the laser meets certain noise requirements; in particular, the relative intensity noise (RIN) of the laser must be low enough to ensure low bit error rate (BER) operation of the link.Type: GrantFiled: October 17, 2007Date of Patent: May 11, 2010Assignee: Avago Technologies Fiber IP (Singapore) Pte. Ltd.Inventors: David George Cunningham, Ronald Kaneshiro, Samir Aboulhouda
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Publication number: 20090103927Abstract: A fiber optic link is provided that uses a relatively low-cost transceiver that incorporates relatively inexpensive low bandwidth optical and electrical components to achieve high data rate operations. The data rate of the fiber optic link can be greater than the data rate of the laser of the transceiver provided the laser meets certain noise requirements; in particular, the relative intensity noise (RIN) of the laser must be low enough to ensure low bit error rate (BER) operation of the link.Type: ApplicationFiled: October 17, 2007Publication date: April 23, 2009Inventors: David George Cunningham, Ronald Kaneshiro, Samir Aboulhouda
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Patent number: 6609834Abstract: A method and apparatus is provided for connecting an optical source to a multimode optical fibre in a multimode optical fibre communications system. A single mode fibre length is provided such that optical radiation admitted from an optical source at one end of the single mode fibre length is provided to a multimode optical fibre at the other end of the single mode fibre length. This method and apparatus is used in a duplex patchcord for connecting an optical transceiver to a pair of installed multimode fibres. The second fibre in the patchcord is a multimode fibre for passing optical signals to the optical receiver of the transceiver.Type: GrantFiled: August 20, 2001Date of Patent: August 26, 2003Assignee: Agilent Technologies, Inc.Inventors: David George Cunningham, Mark Charles Nowell, Robert William Musk, Alistair Neil Coles
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Patent number: 6430230Abstract: In a method for encoding payload bits for transmission over communications link, data and control information are assembled into n-bit data words, where n is an even number and words for control information are constrained to have zero disparity (equal numbers of binary zero and one digits). The n-bit data words are then encoded into n+2-bit code words by adding a two-bit label; for words carrying control information the label has a value of 10. For other data words the disparity is evaluated; if it is zero, the label bits are 01; if the disparity is non-zero and opposite in sense to the running digital sum of the code words transmitted already, the label bits are 11; otherwise, the data word is inverted, and the label bits are 00.Type: GrantFiled: June 30, 1999Date of Patent: August 6, 2002Assignee: Agilent Technologies, Inc.Inventors: David George Cunningham, Alistair Neil Coles
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Publication number: 20020021469Abstract: A method and apparatus is provided for connecting an optical source to a multimode optical fibre in a multimode optical fibre communications system. A single mode fibre length is provided such that optical radiation admitted from an optical source at one end of the single mode fibre length is provided to a multimode optical fibre at the other end of the single mode fibre length. This method and apparatus is used in a duplex patchcord for connecting an optical transceiver to a pair of installed multimode fibres. The second fibre in the patchcord is a multimode fibre for passing optical signals to the optical receiver of the transceiver.Type: ApplicationFiled: August 20, 2001Publication date: February 21, 2002Applicant: AGILENT TECHNOLOGIES, INC.Inventors: David George Cunningham, Mark Charles Nowell, Robert William Musk, Alistair Neil Coles
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Patent number: 6304352Abstract: A method and apparatus is provided for connecting an optical source to a multimode optical fibre in a multimode optical fibre communications system. A single mode fibre length is provided such that optical radiation admitted from an optical source at one end of the single mode fibre length is provided to a multimode optical fibre at the other end of the single mode fibre length. This method and apparatus is used in a duplex patchcord for connecting an optical transceiver to a pair of installed multimode fibres. The second fibre in the patchcord is a multimode fibre for passing optical signals to the optical receiver of the transceiver.Type: GrantFiled: May 12, 1998Date of Patent: October 16, 2001Assignee: Agilent Technologies, Inc.Inventors: David George Cunningham, Mark Charles Nowell, Robert William Musk, Alistair Neil Coles
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Patent number: 6186804Abstract: A bay for receiving an electrical device such as a disc drive is designed for easy insertion and ejection of the drive. The bay, a sliding carriage bearing a forwardly facing ejection member having a forwardly facing ejection pin for passing on the rear of the electrical device, and a lever operated insertion and removal mechanism for the insertion and later removal of said electrical device, including a pivoted lever having a manually engageable handle, a roller carried by the lever for engagement with the forward face of the electrical device, and a quadrant gear coupled to a rack on the sliding carriage, whereby said lever is pivotable to drive the sliding carriage backwards and forwards in the bay by the action of the quandrant gear and rack to carry the elecrical device into and out of the bay.Type: GrantFiled: June 25, 1999Date of Patent: February 13, 2001Assignee: Havant International LimitedInventors: David J. Smith, George A. Cunningham, Gianluca Elmo
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Patent number: 6064786Abstract: A method and apparatus for increasing the operational bandwidth of a multimode optical fiber communications system is provided. The method comprises launching optical radiation into the core of the multimode fiber away from the center of the core so as to strongly excite mid order modes of the multimode fiber, but to only weakly excite low order and high order modes of the multimode fiber. The mid order modes excited are predominately within a small number of mode groups and thus have similar propagation constants. This leads to a reduction in modal dispersion and thus to a significant increase in bandwidth compared to an overfilled launch. The offset launch of the invention is tolerant both to the launch conditions and to any imperfections in the fiber refractive index profile. Modal noise performance is also enhanced. Embodiments of the invention employ a singlemode fiber, a multimode fiber or a lens to illuminate an end face of a multimode fiber with a small spot offset from the optical axis of the fiber.Type: GrantFiled: November 6, 1997Date of Patent: May 16, 2000Assignee: Hewlett-Packard CompanyInventors: David George Cunningham, Lutz Raddatz, Ian White, Mark Charles Nowell
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Patent number: 6008984Abstract: A mounting for a disk file comprises a carrier defining a space into which the disk file can be removably inserted for operational use. The carrier has a base and two opposed sides and, and first and second wedges and which are movable to act between the main body of the disk file and the side of the carrier, to secure the disk file against movement relative to the carrier. The wedges include wedges which are movable in a vertical direction by a control linkage operated automatically when the disk file is inserted into the carrier structure.Type: GrantFiled: February 3, 1998Date of Patent: December 28, 1999Assignee: Havant International LimitedInventors: George A. Cunningham, David R. B. Farquhar, Anthony W. Leonard, Anthony R. Hearn, Robert N. Evans