Patents by Inventor Vincent Handerek
Vincent Handerek 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: 9304017Abstract: There is described a distributed optical fiber sensor for detecting one or more physical parameters indicative of an environmental influence on a sensor optical fiber, as a function of position along the sensor fiber. The sensor uses probe light pulses of different wavelengths. At least some of the probe light pulses may also be of different pulse lengths. The relative phase bias between interferometric signals in backscattered probe light of different wavelength pulses may also be controlled.Type: GrantFiled: November 9, 2011Date of Patent: April 5, 2016Assignee: Fotech Solutions LimitedInventor: Vincent Handerek
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Patent number: 9244009Abstract: There is disclosed a distributed optical fiber sensor arranged to deliver probe light pulses of different wavelengths into corresponding different sensing optical fibers, and to determine one or more parameters as functions of position along each of the sensing fibers from detected backscattered light of each corresponding wavelength. In another arrangement, the different wavelengths are directed in different corresponding directions around a loop of sensing optical fiber.Type: GrantFiled: July 13, 2015Date of Patent: January 26, 2016Assignee: FOTECH SOLUTIONS LIMITEDInventor: Vincent Handerek
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Publication number: 20150323455Abstract: There is disclosed a distributed optical fibre sensor arranged to deliver probe light pulses of different wavelengths into corresponding different sensing optical fibres, and to determine one or more parameters as functions of position along each of the sensing fibres from detected backscattered light of each corresponding wavelength. In another arrangement, the different wavelengths are directed in different corresponding directions around a loop of sensing optical fibre.Type: ApplicationFiled: July 13, 2015Publication date: November 12, 2015Inventor: Vincent Handerek
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Patent number: 9110018Abstract: There is disclosed a distributed optical fiber sensor arranged to deliver probe light pulses of different wavelengths into corresponding different sensing optical fibers, and to determine one or more parameters as functions of position along each of the sensing fibers from detected backscattered light of each corresponding wavelength. In another arrangement, the different wavelengths are directed in different corresponding directions around a loop of sensing optical fiber.Type: GrantFiled: December 6, 2011Date of Patent: August 18, 2015Assignee: FOTECH SOLUTIONS LIMITEDInventor: Vincent Handerek
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Publication number: 20130271769Abstract: There is disclosed a distributed optical fibre sensor arranged to deliver probe light pulses of different wavelengths into corresponding different sensing optical fibres, and to determine one or more parameters as functions of position along each of the sensing fibres from detected backscattered light of each corresponding wavelength. In another arrangement, the different wavelengths are directed in different corresponding directions around a loop of sensing optical fibre.Type: ApplicationFiled: December 6, 2011Publication date: October 17, 2013Applicant: FOTECH SOLUTIONS LIMITEDInventor: Vincent Handerek
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Publication number: 20130222811Abstract: There is described a distributed optical fibre sensor for detecting one or more physical parameters indicative of an environmental influence on a sensor optical fibre, as a function of position along the sensor fibre. The sensor uses probe light pulses of different wavelengths. At least some of the probe light pulses may also be of different pulse lengths. The relative phase bias between interferometric signals in backscattered probe light of different wavelength pulses may also be controlled.Type: ApplicationFiled: November 9, 2010Publication date: August 29, 2013Applicant: FOTECH SOLUTIONS LIMITEDInventor: Vincent Handerek
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Patent number: 7136558Abstract: An optical fiber for communications systems, the fiber being designed to ensure a compensation of Kerr effects. The fiber has a profile which ensures that changes in power produce changes in distribution of power between core and cladding, such that the phase change associated with the changed spatial distribution of the power, is equal and opposite to the phase change due to Kerr Effect.Type: GrantFiled: April 29, 2003Date of Patent: November 14, 2006Assignee: Nortel Networks LimitedInventors: Richard E Epworth, Vincent Handerek, Alan Robinson
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Publication number: 20060109561Abstract: A retroreflective device comprising a substantially spherical graded refractive index lens, referred to as a GRIN-sphere lens (2), a reflective part for retroreflecting (6) a radiation beam (B) passing through the graded refractive index lens and, at least partially surrounding the lens, a transparent material (4) having a substantially uniform refractive index.Type: ApplicationFiled: August 27, 2004Publication date: May 25, 2006Inventors: Vincent Handerek, Leslie Laycock
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Publication number: 20050231803Abstract: This invention relates to retroreflective devices and systems incorporating such devices; the term “retroreflective devices” as used herein being intended to encompass generally optical components used for returning radiation automatically from a remote location toward an optical source. In one aspect, an embodiment of the invention is a retroreflective device comprising a lens having a non-planar outer surface; and a liquid crystal cell having a non-planar layer comprising liquid crystal material, said non-planar layer having a shape corresponding with that of the non-planar outer surface of the lens. The device includes a reflective part arranged to retroreflect a radiation beam passing through the lens, and the liquid crystal cell is arranged to modulate one or more characteristics of said retroreflected radiation beam. Embodiments of the invention are advantageous for use in applications that require thin, transmissive modulators that are compatible with non-planar retroreflecting devices.Type: ApplicationFiled: October 14, 2004Publication date: October 20, 2005Inventors: Vincent Handerek, Leslie Laycock
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Publication number: 20040218879Abstract: An optical fibre for communications systems, the fibre being designed to ensure a compensation of Kerr effects. The fibre has a profile which ensures that changes in power produce changes in distribution of power between core and cladding, such that the phase change associated with the changed spatial distribution of the power, is equal and opposite to the phase change due to Kerr Effect.Type: ApplicationFiled: April 29, 2003Publication date: November 4, 2004Inventors: Richard E. Epworth, Vincent Handerek, Alan Robinson
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Patent number: 6707957Abstract: Compensating for polarization mode dispersion in a birefringent optical transmission fibre is achieved by controlling the birefringence of the fibre. The difference in group velocity of the orthogonal polarization states of an optical signal transmitted over the fibre is monitored to generate an error signal representing the difference. The birefringence of the fibre is adjusted accordingly to minimize the difference and thereby provide dynamic compensation. Birefringence control may be achieved by a non-linear fibre grating written into the fibre to impose a differential time delay. The fibre may be a side hole fibre (SHF), a holey fibre (HF), a photonic crystal fibre (PCF), or any other suitable microstructure fibre. The fibre may have stressing rods, may be tapered along its length and may be controlled electrically, mechanically, acoustically or thermally by spaced heating elements.Type: GrantFiled: December 18, 2001Date of Patent: March 16, 2004Assignee: Nortel Networks LimitedInventors: Andrew L Reynolds, Sotiris E Kanellopoulos, Vincent Handerek
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Patent number: 6640043Abstract: An optical termination element for terminating an optical fiber carrying a signal of first maximum power level comprises a termination fiber which is unable to propagate a fiber fuse when the signal power is below a threshold power level which is greater than the first maximum power level. The termination fiber is designed by selecting values of the core diameter and the higher mode cutoff wavelength. The intention provides a termination component in which a fiber fuse can not be initiated at the maximum power to be provided to the termination.Type: GrantFiled: December 22, 2000Date of Patent: October 28, 2003Assignee: Nortel Networks LimitedInventor: Vincent Handerek
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Patent number: 6628871Abstract: A method of routing of signals through an optical network involves determining a route through the network for which the power level within each branch of the network along the route is below a threshold power level which is a function of the fiber characteristics of the branch. This threshold power is the power below which a fiber fuse can not be initiated. This method enables power levels within a network to be controlled such that the threshold power is not exceeded, and a fiber fuse will not be initiated. The invention provides a network controller for carrying out this method.Type: GrantFiled: December 22, 2000Date of Patent: September 30, 2003Assignee: Nortel Networks LimitedInventors: Andrew V. Maroney, Vincent Handerek, Kevin J Cordina
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Publication number: 20030058522Abstract: An optical converter 1 has a light source 2 producing light of one wavelength and an optical fibre 4 in which light from the source 2 is converted by Raman scattering from the one wavelength to another wavelength. The light of the another wavelength is output from the fibre 4. The fibre 4 is doped with deuterium which has a relatively long Stoke's shift such that the minimum number of shifts are involved in the conversion from the one wavelength to the another wavelength. The doping is achieved by saturating the fibre 4 with deuterium which is fixed by exposure to UV light.Type: ApplicationFiled: September 21, 2001Publication date: March 27, 2003Inventors: Andrew V. Maroney, Vincent Handerek
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Patent number: 6526192Abstract: An optical component for halting the propagation of a fiber fuse through a transmission fiber has a threshold power level which is greater than the transmission power level of the system for that transmission fiber. The component comprises a fiber which is selected such that it is unable to propagate a fiber fuse when the power is below the threshold power level. The component is designed by selecting values of the core diameter and the higher mode cutoff wavelength of the fiber making up the component. If power surges are experienced which exceed the transmission power level (the transmission fiber being designed to operate at the transmission power levels without fiber fuses being initiated) then the component provide a safety margin.Type: GrantFiled: December 22, 2000Date of Patent: February 25, 2003Assignee: Nortel Networks LimitedInventors: Andrew V Maroney, Vincent Handerek, Kevin J Cordina
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Patent number: 6490389Abstract: The fibre fuse effect, also termed self propelled self focusing (SPSF) is a catastrophic damage mechanism resulting from a runaway thermal affect which can melt optical fibres. A method and apparatus for limiting the damage caused by a fibre fuse is provided by utilising a detector external to the fibre for monitoring the condition of the fibre.Type: GrantFiled: April 6, 2000Date of Patent: December 3, 2002Assignee: Nortel Networks LimitedInventors: Richard Goodwin, Terry Clapp, Alan Robinson, Vincent Handerek
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Patent number: 6452716Abstract: A power supply for a pump laser in a distributed Raman amplifier is modulated with a small amount of amplitude modulation. This amplitude modulation transfers to the traffic wavelengths and is detected at a Raman amplifier control system. The Raman amplifier control system decodes the modulation and determines the amount of modulation transferred to the traffic. Given knowledge of the signal level of the modulation that was applied the gain of the distributed Raman amplifier may be determined. The Raman amplifier control system may then control the power supplied to the pump laser to result in a specific gain, thus providing closed loop control.Type: GrantFiled: October 5, 2000Date of Patent: September 17, 2002Assignee: Nortel Networks LimitedInventors: David W. Park, Christopher R S Fludger, Vincent A. Handerek
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Publication number: 20020114554Abstract: An optical component for halting the propagation of a fiber fuse through a transmission fiber has a threshold power level which is greater than the transmission power level of the system for that transmission fiber. The component comprises a fiber which is selected such that it is unable to propagate a fiber fuse when the power is below the threshold power level. The component is designed by selecting values of the core diameter and the higher mode cutoff wavelength of the fiber making up the component. If power surges are experienced which exceed the transmission power level (the transmission fiber being designed to operate at the transmission power levels without fiber fuses being initiated) then the component provide a safety margin.Type: ApplicationFiled: December 22, 2000Publication date: August 22, 2002Inventors: Andrew V. Maroney, Vincent Handerek, Kevin J. Cordina
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Publication number: 20020114608Abstract: A method of routing of signals through an optical network involves determining a route through the network for which the power level within each branch of the network along the route is below a threshold power level which is a function of the fiber characteristics of the branch. This threshold power is the power below which a fiber fuse can not be initiated. This method enables power levels within a network to be controlled such that the threshold power is not exceeded, and a fiber fuse will not be initiated. The invention provides a network controller for carrying out this method.Type: ApplicationFiled: December 22, 2000Publication date: August 22, 2002Inventors: Andrew V. Maroney, Vincent Handerek, Kevin J. Cordina
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Publication number: 20020114605Abstract: An optical termination element for terminating an optical fiber carrying a signal of first maximum power level comprises a termination fiber which is unable to propagate a fiber fuse when the signal power is below a threshold power level which is greater than the first maximum power level. The termination fiber is designed by selecting values of the core diameter and the higher mode cutoff wavelength. The intention provides a termination component in which a fiber fuse can not be initiated at the maximum power to be provided to the termination.Type: ApplicationFiled: December 22, 2000Publication date: August 22, 2002Inventor: Vincent Handerek