Patents by Inventor Peter Magill
Peter Magill 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: 9337928Abstract: Methods, systems, and apparatuses for time-based composite modulation of an optical carrier signal are provided. Time-based composite modulation includes determining a plurality of fixed time slots for the optical carrier signal, wherein the plurality of fixed time slots comprise a time-division-multiplexing frame. Determining a modulation format for each fixed time slot of the time-division-multiplexing frame, wherein a transport spectral efficiency of the modulation format determined for a first fixed time slot is different from a transport spectral efficiency of the modulation format determined for a second fixed time slot, and determining a number of binary bits for each fixed time slot of the time-division-multiplexing frame, wherein the number of binary bits for a fixed time slot is based on the modulation format determined for the fixed time slot.Type: GrantFiled: September 4, 2014Date of Patent: May 10, 2016Assignee: AT&T Intellectual Property I, L.P.Inventors: Xiang Zhou, Peter Magill
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Publication number: 20150326338Abstract: Methods, systems, and apparatuses for time-based composite modulation of an optical carrier signal are provided. Time-based composite modulation includes determining a plurality of fixed time slots for the optical carrier signal, wherein the plurality of fixed time slots comprise a time-division-multiplexing frame. Determining a modulation format for each fixed time slot of the time-division-multiplexing frame, wherein a transport spectral efficiency of the modulation format determined for a first fixed time slot is different from a transport spectral efficiency of the modulation format determined for a second fixed time slot, and determining a number of binary bits for each fixed time slot of the time-division-multiplexing frame, wherein the number of binary bits for a fixed time slot is based on the modulation format determined for the fixed time slot.Type: ApplicationFiled: September 4, 2014Publication date: November 12, 2015Inventors: Xiang Zhou, Peter Magill
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Patent number: 8855495Abstract: Methods, systems, and apparatuses for time-based composite modulation of an optical carrier signal are provided. Time-based composite modulation includes determining a plurality of fixed time slots for the optical carrier signal, wherein the plurality of fixed time slots comprise a time-division-multiplexing frame. Determining a modulation format for each fixed time slot of the time-division-multiplexing frame, wherein a transport spectral efficiency of the modulation format determined for a first fixed time slot is different from a transport spectral efficiency of the modulation format determined for a second fixed time slot, and determining a number of binary bits for each fixed time slot of the time-division-multiplexing frame, wherein the number of binary bits for a fixed time slot is based on the modulation format determined for the fixed time slot.Type: GrantFiled: November 30, 2011Date of Patent: October 7, 2014Assignee: AT&T Intellectual Property I, L.P.Inventors: Xiang Zhou, Peter Magill
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Patent number: 8543007Abstract: Described is a method and system for reducing system penalty from polarization mode dispersion. The method includes receiving a plurality of signals at a receiving end of a transmission line, each signal being received on one of a plurality of channels of the transmission line and measuring a signal degradation of at least one of the channels of the transmission line. An amount of adjustment of a polarization controller is determined based on the signal degradation, the amount of adjustment being selected to reduce the polarization mode dispersion. The amount of adjustment is then transmitted to the polarization controller.Type: GrantFiled: December 1, 2010Date of Patent: September 24, 2013Assignee: AT&T Intellectual Property II, L.P.Inventors: Mikhail Boroditsky, Mikhail Brodsky, Nicholas J. Frigo, Peter Magill
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Publication number: 20130136452Abstract: Methods, systems, and apparatuses for time-based composite modulation of an optical carrier signal are provided. Time-based composite modulation includes determining a plurality of fixed time slots for the optical carrier signal, wherein the plurality of fixed time slots comprise a time-division-multiplexing frame. Determining a modulation format for each fixed time slot of the time-division-multiplexing frame, wherein a transport spectral efficiency of the modulation format determined for a first fixed time slot is different from a transport spectral efficiency of the modulation format determined for a second fixed time slot, and determining a number of binary bits for each fixed time slot of the time-division-multiplexing frame, wherein the number of binary bits for a fixed time slot is based on the modulation format determined for the fixed time slot.Type: ApplicationFiled: November 30, 2011Publication date: May 30, 2013Applicant: AT&T INTELLECTUAL PROPERTY I, LPInventors: Xiang Zhou, Peter Magill
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Patent number: 8077375Abstract: A system and method for producing an 8-QAM-modulated signal are disclosed. The methodology, in an exemplary expedient, generally comprises splitting light from a CW laser into two parts; modulating the first part with a first signal and modulating the second part with a second signal; phase shifting the modulated second part by about ?/4; combining the modulated first part with the phase shifted and modulated second part to produce a four-level modulated signal; and phase modulating the four-level modulated signal with a third signal with a phase modulation of (0, ?/2). Several variations of this method are described herein.Type: GrantFiled: November 11, 2009Date of Patent: December 13, 2011Assignee: AT&T Intellectual Property I, L.P.Inventors: Xiang Zhou, Peter Magill
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Patent number: 7969562Abstract: Disclosed is a method and apparatus for determining the birefringence autocorrelation length of a fiber in a non-destructive manner. The PMD of an optical fiber is measured over a first optical spectrum. A Faraday rotation angle is measured over a second optical spectrum. The birefringence autocorrelation length is determined from the measuring of the PMD and the Faraday rotation angle.Type: GrantFiled: December 22, 2009Date of Patent: June 28, 2011Assignee: AT&T Intellectual Property I, L.P.Inventors: Mikhail Brodsky, Peter Magill, Mikhail Boroditsky, Cristian Antonelli, Antonio Mecozzi
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Patent number: 7956993Abstract: A method of determining a mean square differential group delay associated with a length of optical fiber. The method including measuring a polarization mode dispersion vector as a function of frequency, using a frequency-domain polarization mode dispersion measurement apparatus. The method also including calculating a second-order polarization mode dispersion vector as a function of frequency by calculating a derivative of the polarization mode dispersion vector with respect to frequency. Also, calculating the mean of the magnitude of the second-order polarization mode dispersion vector to obtain a first result. Further, multiplying a proportionality coefficient by the first result to calculate the mean square differential group delay.Type: GrantFiled: November 1, 2010Date of Patent: June 7, 2011Assignee: AT&T Intellectual Property II, LPInventors: Mikhail Boroditsky, Mikhail Brodsky, Nicholas J. Frigo, Peter Magill
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Publication number: 20110129215Abstract: Described is a method and system for reducing system penalty from polarization mode dispersion. The method includes receiving a plurality of signals at a receiving end of a transmission line, each signal being received on one of a plurality of channels of the transmission line and measuring a signal degradation of at least one of the channels of the transmission line. An amount of adjustment of a polarization controller is determined based on the signal degradation, the amount of adjustment being selected to reduce the polarization mode dispersion. The amount of adjustment is then transmitted to the polarization controller.Type: ApplicationFiled: December 1, 2010Publication date: June 2, 2011Inventors: Mikhail BORODITSKY, Mikhail Brodsky, Nicholas J. Frigo, Peter Magill
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Publication number: 20110109954Abstract: A system and method for producing an 8-QAM-modulated signal are disclosed. The methodology, in an exemplary expedient, generally comprises splitting light from a CW laser into two parts; modulating the first part with a first signal and modulating the second part with a second signal; phase shifting the modulated second part by about ?/4; combining the modulated first part with the phase shifted and modulated second part to produce a four-level modulated signal; and phase modulating the four-level modulated signal with a third signal with a phase modulation of (0, ?/2). Several variations of this method are described herein.Type: ApplicationFiled: November 11, 2009Publication date: May 12, 2011Inventors: Xiang Zhou, Peter Magill
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Publication number: 20110051126Abstract: A method of determining a mean square differential group delay associated with a length of optical fiber. The method including measuring a polarization mode dispersion vector as a function of frequency, using a frequency-domain polarization mode dispersion measurement apparatus. The method also including calculating a second-order polarization mode dispersion vector as a function of frequency by calculating a derivative of the polarization mode dispersion vector with respect to frequency. Also, calculating the mean of the magnitude of the second-order polarization mode dispersion vector to obtain a first result. Further, multiplying a proportionality coefficient by the first result to calculate the mean square differential group delay.Type: ApplicationFiled: November 1, 2010Publication date: March 3, 2011Applicant: AT&T CORP.Inventors: Mikhail Boroditsky, Mikhail Brodsky, Nicholas J. Frigo, Peter Magill
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Patent number: 7869716Abstract: Described is a method and system for reducing system penalty from polarization mode dispersion. The method includes receiving a plurality of signals at a receiving end of a transmission line, each signal being received on one of a plurality of channels of the transmission line and measuring a signal degradation of at least one of the channels of the transmission line. An amount of adjustment of a polarization controller is determined based on the signal degradation, the amount of adjustment being selected to reduce the polarization mode dispersion. The amount of adjustment is then transmitted to the polarization controller.Type: GrantFiled: August 31, 2005Date of Patent: January 11, 2011Assignee: AT&T Intellectual Property II, L.P.Inventors: Mikhail Boroditsky, Mikhail Brodsky, Nicholas J. Frigo, Peter Magill
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Patent number: 7852467Abstract: The present invention provides a method of determining a mean differential group delay associated with a length of optical fiber. The method including measuring a magnitude of a polarization mode dispersion vector as a function of frequency, using a frequency-domain polarization mode dispersion measurement apparatus, where the magnitude of the polarization mode dispersion vector is a scalar differential group delay. Also the method calculates a frequency derivative of the scalar differential group delay from the magnitude of the polarization mode dispersion vector to obtain a first result. The frequency derivative of the scalar differential group delay being a scalar second-order polarization mode dispersion function. The method further multiplies a proportionality coefficient B2 by the first result to calculate the mean differential group delay. Also, the method outputs a value of the mean differential group delay.Type: GrantFiled: February 9, 2010Date of Patent: December 14, 2010Assignee: At&T Intellectual Property II, L.P.Inventors: Mikhail Boroditsky, Mikhail Brodsky, Nicholas J. Frigo, Peter Magill
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Patent number: 7773207Abstract: Polarization mode dispersion (PMD) induced system penalty ? is determined from optical characteristics of an optical wavelength division multiplexed (WDM) signal that is carried on a network. The method involves tapping the optical WDM signal, separating an optical channel from the tapped optical WDM signal, performing a frequency-resolved state of polarization (SOP) measurement on the channel, and computing the PMD-induced system penalty as ?=AL2+BL4, in which A and B are predetermined parameters and L is an SOP string length based on the SOP measurement.Type: GrantFiled: August 19, 2008Date of Patent: August 10, 2010Assignee: AT&T Corp.Inventors: Mikhail Boroditsky, Mikhail Brodsky, Nicholas J. Frigo, Peter Magill
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Publication number: 20100134788Abstract: The present invention provides a method of determining a mean differential group delay associated with a length of optical fiber. The method including measuring a magnitude of a polarization mode dispersion vector as a function of frequency, using a frequency-domain polarization mode dispersion measurement apparatus, where the magnitude of the polarization mode dispersion vector is a scalar differential group delay. Also the method calculates a frequency derivative of the scalar differential group delay from the magnitude of the polarization mode dispersion vector to obtain a first result. The frequency derivative of the scalar differential group delay being a scalar second-order polarization mode dispersion function. The method further multiplies a proportionality coefficient B2 by the first result to calculate the mean differential group delay. Also, the method outputs a value of the mean differential group delay.Type: ApplicationFiled: February 9, 2010Publication date: June 3, 2010Applicant: AT&T CORP.Inventors: Mikhail Boroditsky, Mikhail Brodsky, Nicholas J. Frigo, Peter Magill
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Publication number: 20100123896Abstract: Disclosed is a method and apparatus for determining the birefringence autocorrelation length of a fiber in a non-destructive manner. The PMD of an optical fiber is measured over a first optical spectrum. A Faraday rotation angle is measured over a second optical spectrum. The birefringence autocorrelation length is determined from the measuring of the PMD and the Faraday rotation angle.Type: ApplicationFiled: December 22, 2009Publication date: May 20, 2010Applicant: AT&T INTELLECTUAL PROPERTY I, L.P.Inventors: Mikhail Brodsky, Peter Magill, Mikhail Boroditsky, Cristian Antonelli, Antonio Mecozzi
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Patent number: 7688430Abstract: Disclosed is a method and apparatus for determining the birefringence autocorrelation length of a fiber in a non-destructive manner. The PMD of an optical fiber is measured over a first optical spectrum. A Faraday rotation angle is measured over a second optical spectrum. The birefringence autocorrelation length is determined from the measuring of the PMD and the Faraday rotation angle.Type: GrantFiled: December 10, 2007Date of Patent: March 30, 2010Assignee: AT&T Intellectual Property I, L.P.Inventors: Mikhail Brodsky, Peter Magill, Mikhail Boroditsky, Cristian Antonelli, Antonio Mecozzi
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Publication number: 20090147244Abstract: Disclosed is a method and apparatus for determining the birefringence autocorrelation length of a fiber in a non-destructive manner. The PMD of an optical fiber is measured over a first optical spectrum. A Faraday rotation angle is measured over a second optical spectrum. The birefringence autocorrelation length is determined from the measuring of the PMD and the Faraday rotation angle.Type: ApplicationFiled: December 10, 2007Publication date: June 11, 2009Inventors: Mikhail Brodsky, Peter Magill, Mikhail Boroditsky, Cristian Antonelli, Antonio Mecozzi
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Patent number: 7546039Abstract: Certain exemplary embodiments comprise a method that can comprise, responsive to an instruction to change a setting of a polarization controller, automatically changing a first rotational speed of a birefringent plate associated with the polarization controller to orient the birefringent plate pseudo-randomly over time with respect to a predetermined axis.Type: GrantFiled: November 28, 2005Date of Patent: June 9, 2009Assignee: AT&T Intellectual Property, II, L.P.Inventors: Mikhail Boroditsky, Mikhail Brodsky, Nicholas Frigo, Peter Magill
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Patent number: D583978Type: GrantFiled: May 1, 2008Date of Patent: December 30, 2008Assignee: Lutron Electronics Co., Inc.Inventors: Roger Duffy, Peter Magill, Mikako Oshima