Patents by Inventor Moshe Tur
Moshe Tur 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: 10036686Abstract: A method and a system for ultimately fast frequency-scanning Brillouin optical time domain analysis are provided herein. The method may include: simultaneously launching two pairs each having a pulsed pump wave and a counter-propagating constant wave (CW) probe wave, into an optical fiber, wherein the pulsed pumps have orthogonal States of Polarization (SOPs), and wherein the two CW probe waves have a same SOP; scanning common pump-probe frequency difference, over a frequency range that encompasses a respective Brillouin Gain Spectrum (BGS) and current and expected spectral shifts of the BGS along the optical fiber; deriving, a local Brillouin Frequency Shift (BFS), in a distributed manner along the optical fiber, which is defined as the pump-probe frequency difference which maximizes the Brillouin gain on the BGS; and determining strain and/or temperature in a distributed manner along the optical fiber, based on the respective local BFS.Type: GrantFiled: March 22, 2016Date of Patent: July 31, 2018Assignee: Ramot at Tel-Aviv University Ltd.Inventors: Moshe Tur, Ido Sovran, Avi Motil
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Patent number: 9885619Abstract: A method of stimulated Brillouin scattering is proposed in which both slopes of the BGS spectrum are probed to achieve immunity to pump power variations. Suitably applied, the technique can maintain all the benefits of the known Slope-Assisted-BOTDA technique, while using the same setup but at the cost of halving the sampling speed. the method may include: obtaining a reference Brillouin gain spectrum (BGS) representative of steady state or average conditions in various locations of the optical fiber along its length; generating, based on the reference BGS, a probe wave being a complex waveform comprising a first and second set of waveforms, each set having waveforms tailored to match an opposite slope of the reference BGS, at the various locations; performing stimulated Brillouin scattering at the various locations by applying a pump pulse wave to the probe wave; and deducing the local Brillouin frequency shift (BFS) at the various locations.Type: GrantFiled: January 1, 2015Date of Patent: February 6, 2018Assignee: Ramot at Tel-Aviv University Ltd.Inventors: Moshe Tur, Avi Motil, Yair Peled, Or Danon
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Patent number: 9768909Abstract: In at least one aspect, a device for Orbital Angular Momentum (OAM) based optical communication includes a first spatial light modulator configured to down-convert a first plurality of higher-order OAM modes from a communication signal to a second plurality of higher-order OAM modes and a first Gaussian mode, a second spatial light modulator configured to drop the first Gaussian mode and add a second Gaussian mode to the second plurality of higher-order OAM modes, and a third spatial light modulator configured to up-convert the second plurality of higher-order OAM modes and the second Gaussian mode to a third plurality of higher-order OAM modes for further communications.Type: GrantFiled: March 19, 2015Date of Patent: September 19, 2017Assignee: University of Southern CaliforniaInventors: Hao Huang, Yang Yue, Nisar Ahmed, Moshe J. Willner, Yan Yan, Yongxiong Ren, Moshe Tur, Alan E. Willner
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Publication number: 20160327436Abstract: A method of stimulated Brillouin scattering is proposed in which both slopes of the BGS spectrum are probed to achieve immunity to pump power variations. Suitably applied, the technique can maintain all the benefits of the known Slope-Assisted-BOTDA technique, while using the same setup but at the cost of halving the sampling speed. the method may include: obtaining a reference Brillouin gain spectrum (BGS) representative of steady state or average conditions in various locations of the optical fiber along its length; generating, based on the reference BGS, a probe wave being a complex waveform comprising a first and second set of waveforms, each set having waveforms tailored to match an opposite slope of the reference BGS, at the various locations; performing stimulated Brillouin scattering at the various locations by applying a pump pulse wave to the probe wave; and deducing the local Brillouin frequency shift (BFS) at the various locations.Type: ApplicationFiled: January 1, 2015Publication date: November 10, 2016Inventors: Moshe TUR, Avi MOTIL, Yair PELED, Orr DANON
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Publication number: 20160273998Abstract: A method and a system for ultimately fast frequency-scanning Brillouin optical time domain analysis are provided herein. The method may include: simultaneously launching two pairs each having a pulsed pump wave and a counter-propagating constant wave (CW) probe wave, into an optical fiber, wherein the pulsed pumps have orthogonal States of Polarization (SOPs), and wherein the two CW probe waves have a same SOP; scanning common pump-probe frequency difference, over a frequency range that encompasses a respective Brillouin Gain Spectrum (BGS) and current and expected spectral shifts of the BGS along the optical fiber; deriving, a local Brillouin Frequency Shift (BFS), in a distributed manner along the optical fiber, which is defined as the pump-probe frequency difference which maximizes the Brillouin gain on the BGS; and determining strain and/or temperature in a distributed manner along the optical fiber, based on the respective local BFS.Type: ApplicationFiled: March 22, 2016Publication date: September 22, 2016Inventors: Moshe TUR, Ido SOVRAN, Avi MOTIL
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Publication number: 20150349910Abstract: In at least one aspect, a device for Orbital Angular Momentum (OAM) based optical communication includes a first spatial light modulator configured to down-convert a first plurality of higher-order OAM modes from a communication signal to a second plurality of higher-order OAM modes and a first Gaussian mode, a second spatial light modulator configured to drop the first Gaussian mode and add a second Gaussian mode to the second plurality of higher-order OAM modes, and a third spatial light modulator configured to up-convert the second plurality of higher-order OAM modes and the second Gaussian mode to a third plurality of higher-order OAM modes for further communications.Type: ApplicationFiled: March 19, 2015Publication date: December 3, 2015Applicant: UNIVERSITY OF SOUTHERN CALIFORNIAInventors: Hao Huang, Yang Yue, Nisar Ahmed, Moshe J. Willner, Yan Yan, Yongxiong Ren, Moshe Tur, Alan E. Willner
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Patent number: 8982340Abstract: A method for conducting fast Brillouin optical time domain analysis for dynamic sensing of optical fibers is provided herein. The method includes the following stages: injecting a pump pulse signal into a first end of an optical fiber and a probe signal into a second end of the optical fiber, wherein the probe and the pump pulse signals exhibit a frequency difference between them that is appropriate for an occurrence of a Brillouin effect; alternating the frequency of either the probe or the pulse signals, so as the alternated signal exhibits a series of signal sections, each signal section having a predefined common duration and a different frequency; measuring the Brillouin probe gain for each one of the alternating frequencies; and extracting physical properties of the optical fiber throughout its length at sample points associated with the sampled time and the frequencies, based on the measured Brillouin probe gain.Type: GrantFiled: July 22, 2013Date of Patent: March 17, 2015Assignee: Ramot at Tel-Aviv University Ltd.Inventors: Yair Peled, Moshe Tur
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Patent number: 8800375Abstract: Methods and systems used to perform sweep-free stimulated Brillouin scattering-based fiber optical sensing are described. In one aspect, a method includes interrogating different parts of a Brillouin gain spectrum using multiple optical tones in an optical fiber. The interrogating includes sending at least two pump tones into the optical fiber from one end of the optical fiber, such that a frequency spacing between the pump tones is larger than a width of the Brillouin gain spectrum. The interrogating also includes sending at least two probe tones into the optical fiber from another end of the optical fiber, such that a frequency spacing between the probe tones is different from the frequency spacing between the pump tones. The method further includes generating a sensing output based on the interrogating.Type: GrantFiled: March 2, 2012Date of Patent: August 12, 2014Assignee: University of Southern CaliforniaInventors: Asher Voskoboinik, Alan E. Willner, Moshe Tur
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Publication number: 20140022536Abstract: A method for conducting fast Brillouin optical time domain analysis for dynamic sensing of optical fibers is provided herein. The method includes the following stages: injecting a pump pulse signal into a first end of an optical fiber and a probe signal into a second end of the optical fiber, wherein the probe and the pump pulse signals exhibit a frequency difference between them that is appropriate for an occurrence of a Brillouin effect; alternating the frequency of either the probe or the pulse signals, so as the alternated signal exhibits a series of signal sections, each signal section having a predefined common duration and a different frequency; measuring the Brillouin probe gain for each one of the alternating frequencies; and extracting physical properties of the optical fiber throughout its length at sample points associated with the sampled time and the frequencies, based on the measured Brillouin probe gain.Type: ApplicationFiled: July 22, 2013Publication date: January 23, 2014Inventors: YAIR PELED, MOSHE TUR
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Publication number: 20130308682Abstract: A method of distributed and dynamical Brillouin sensing in optical fibers is provided herein. The method includes the following stages: deriving average characteristics of an optical fiber along its length; generating a variable frequency probe signal, such that the variable frequency is tailored to match, at specified points along the fiber, the respective average characteristics; injecting the variable frequency probe signal to a first end of the optical fiber and a periodic pulse signal to a second end of the optical fiber, wherein the injecting is synchronized such that a stimulated Brillouin scattering is carried out at each one of the specified points along the optical fiber, such that a frequency difference between the probe signal and the pump signal matches the average characteristics of the fiber; and measuring occurrences of the stimulated Brillouin scattering, to yield data indicative of strain and temperature at all points along the optical fiber.Type: ApplicationFiled: January 26, 2012Publication date: November 21, 2013Applicant: Ramot at Tel Aviv University Ltd.Inventors: Moshe Tur, Yair Peled
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Publication number: 20130025374Abstract: Methods and systems used to perform sweep-free stimulated Brillouin scattering-based fiber optical sensing are described. In one aspect, a method includes interrogating different parts of a Brillouin gain spectrum using multiple optical tones in an optical fiber. The interrogating includes sending at least two pump tones into the optical fiber from one end of the optical fiber, such that a frequency spacing between the pump tones is larger than a width of the Brillouin gain spectrum. The interrogating also includes sending at least two probe tones into the optical fiber from another end of the optical fiber, such that a frequency spacing between the probe tones is different from the frequency spacing between the pump tones. The method further includes generating a sensing output based on the interrogating.Type: ApplicationFiled: March 2, 2012Publication date: January 31, 2013Applicant: UNIVERSITY OF SOUTHERN CALIFORNIAInventors: Asher Voskoboinik, Alan E. Willner, Moshe Tur
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Patent number: 7809277Abstract: Methods and systems for higher-order PMD compensation are implemented by developing an effective mathematical model and applying economical design techniques to the model. By assuming a constant precession rate for a narrow band of frequencies in an optical signal, a simplified model of a higher-order PMD compensator can be derived. The model can be used produce an economical compensator by making multiple uses of selected optical components.Type: GrantFiled: February 14, 2008Date of Patent: October 5, 2010Assignee: AT&T Intellectual Property II, L.P.Inventors: Antonio Mecozzi, Jonathan A. Nagel, Mark Shtaif, Moshe Tur
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Patent number: 7333728Abstract: Methods and systems for higher-order PMD compensation are implemented by developing an effective mathematical model and applying economical design techniques to the model. By assuming a constant precession rate for a narrow band of frequencies in an optical signal, a simplified model of a higher-order PMD compensator can be derived. The model can be used produce an economical compensator by making multiple uses of selected optical components.Type: GrantFiled: February 2, 2007Date of Patent: February 19, 2008Assignee: AT&T Corp.Inventors: Antonio Mecozzi, Jonathan A. Nagel, Mark Shtaif, Moshe Tur
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Patent number: 7203423Abstract: Methods and systems for higher-order PMD compensation are implemented by developing an effective mathematical model and applying economical design techniques to the model. By assuming a constant precession rate for a narrow band of frequencies in an optical signal, a simplified model of a higher-order PMD compensator can be derived. The model can be used produce an economical compensator by making multiple uses of selected optical components.Type: GrantFiled: September 30, 2005Date of Patent: April 10, 2007Assignee: AT&T Corp.Inventors: Antonio Mecozzi, Jonathan A. Nagel, Mark Shtaif, Moshe Tur
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Patent number: 6980744Abstract: Methods and systems for higher-order PMD compensation are implemented by developing an effective mathematical model and applying economical design techniques to the model. By assuming a constant precession rate for a narrow band of frequencies in an optical signal, a simplified model of a higher-order PMD compensator can be derived. The model can be used produce an economical compensator by making multiple uses of selected optical components.Type: GrantFiled: September 9, 2003Date of Patent: December 27, 2005Assignee: AT&T Corp.Inventors: Antonio Mecozzi, Jonathan A. Nagel, Mark Shtaif, Moshe Tur
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Patent number: 6674972Abstract: Methods and systems for higher-order PMD compensation are implemented by developing an effective mathematical model and applying economical design techniques to the model. By assuming a constant precession rate for a narrow band of frequencies in an optical signal, a simplified model of a higher-order PMD compensator can be derived. The model can be used produce an economical compensator by making multiple uses of selected optical components.Type: GrantFiled: August 29, 2000Date of Patent: January 6, 2004Assignee: AT&T Corp.Inventors: Antonio Mecozzi, Jonathan A. Nagel, Mark Shtaif, Moshe Tur
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Patent number: 6134037Abstract: In an optical network through which data is transmitted as a stream of bits during successive bit periods by an optical source with a given optical center frequency, to a receiver for detecting a frequency baseband, interferometric noise power, in particular incoherent beat noise power, is minimized by causing a variation in the center frequency of the source such as to cause a redistribution of the incoherent beat noise power from the baseband to higher frequencies, thereby reducing the noise in the baseband.Type: GrantFiled: October 27, 1997Date of Patent: October 17, 2000Assignee: British Telecommunications public limited companyInventors: Mohammed Shabeer, Peter Edward Barnsley, Moshe Tur, Peter Jonathon Legg, David Kennedy Hunter
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Patent number: 4770535Abstract: A distributed sensor system using pulsed optical signals optionally produced by a short coherence length source to provide a phase difference output signal representative of conditions affecting a selected sensor. In one preferred embodiment, an array of fiber-optic sensors are organized in a ladder configuration, with the sensors positioned in spaced relation and defining the rungs of the ladder. Light pulses transmitted through the sensors are multiplexed onto a return arm of the ladder. The multiplexed signals are received by an optical fiber compensating interferometer which coherently couples portions of adjacent multiplexed light signals to produce a phase difference signal representing conditions influencing selected sensors.Type: GrantFiled: June 23, 1986Date of Patent: September 13, 1988Assignee: The Board of Trustees of the Leland Stanford Junior UniversityInventors: Byoung Y. Kim, Moshe Tur, Janet L. Brooks, Kenneth A. Fesler, Herbert J. Shaw
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Patent number: 4768880Abstract: A technique and system for accurate determination of differential propagation delays in fiber-optic circuits. The method includes providing a sinusoidally modulated optical signal to each of two waveguides defining optical paths. The optical signals received from the optical paths are combined to form a reference output signal which has a null waveform whenever the propagation delay between the optical signals contains an odd number of half periods of the optical signal waveforms. The difference in the sinusoidal modulation frequency producing a first and second null or constant waveform in the reference signal is determined. This difference value between adjacent frequencies forming the null or constant waveforms comprises the inverse of the difference of signal propagation delay in the two optical paths. Accuracy is improved by measuring the sinusoidal modulation frequencies corresponding to first and second waveforms which are not formed by adjacent frequencies.Type: GrantFiled: June 23, 1986Date of Patent: September 6, 1988Assignee: The Board of Trustees of the Leland Stanford Junior UniversityInventors: Moshe Tur, Byoung Y. Kim, Janet L. Brooks, Herbert J. Shaw
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Patent number: 4699513Abstract: A distributed sensor system including an optical source having a short coherence length for optionally continuously monitoring each sensor in the system. In one preferred embodiment, an array of fiber-optic sensors are organized in a ladder configuration, with the sensors positioned in spaced relation and defining the rungs of the ladder. Light transmitted through the sensors is multiplexed onto a return arm of the ladder, with sensor spacing being such that interference between light from different sensors is prevented. The multiplexed signals are received by an optical fiber receiver which couples the multiplexed light with an interfering optical reference signal to produce a phase difference signal representing conditions influencing selected sensors. Embodiments are disclosed for use of either pulsed or continuous wave light sources.Type: GrantFiled: May 28, 1985Date of Patent: October 13, 1987Assignee: Stanford UniversityInventors: Janet L. Brooks, Moshe Tur, Robert C. Youngquist, Byoung Y. Kim, Robert H. Wentworth, Herbert J. Shaw, Kjell Blotekjaer