Patents by Inventor David S. Levy
David S. Levy 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: 20130316166Abstract: The present invention provides a material that comprises hygroscopic or deliquescent particles encapsulated in a transparent matrix which may or may not be on a support or substrate, the process for obtaining said material and the use thereof for the manufacturing of devices with controlled variable optical transmission.Type: ApplicationFiled: November 8, 2011Publication date: November 28, 2013Applicant: Consejo Superior De Investigaciones Cientificas (CSIC)Inventors: David S. Levy Cohen, Marcos D. Zayat Souss, Erick Castellon Elizondo
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Patent number: 8305881Abstract: A method and system for maximizing wavelength reuse in an optically protected wavelength-division-multiplexed (WDM) network, the WDM network supporting a plurality of service connections, includes associating service connections supported by non-overlapping paths to form respective service channel groups, and for each service channel group, assigning at least one common wavelength channel for establishing the service connections. In addition, for each of said groups, at least one common wavelength channel is assigned for establishing a shared protection path for the service connections of each of said groups. In addition, the wavelength channels assigned for establishing the shared protection paths for each of the groups may be used for providing service connections for the WDM network when not in use as shared protection paths. However such provisional service connections are dropped when the wavelength channels are needed to establish shared protection paths.Type: GrantFiled: August 17, 2004Date of Patent: November 6, 2012Assignee: Alcatel LucentInventors: Robert S. Harby, David S. Levy, Dat D. Ngo, James Dorian Sandoz, Charles Small
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Patent number: 7437075Abstract: An integrated reconfigurable planar lightwave add-drop (RPLAD) multiplexer for use in a WDM optical communication system is arranged such that each drop port can receive any wavelength channel and each add port can transmit on any wavelength channel. Drop port reconfigurability is achieved by integrating a cross-connect functionality into the RPLAD, illustratively using optical 1×2 switches to perform “space” switching. The switches are controlled from a remotely located node controller. Add port reconfigurability is achieved by having tunable lasers and a wavelength independent optical power combiner, which may be a star coupler that is integrated with the other above-mentioned elements.Type: GrantFiled: August 27, 2002Date of Patent: October 14, 2008Assignee: Lucent Technologies Inc.Inventors: Christopher Richard Doerr, David S Levy, Timothy O. Murphy, Alice Elizabeth White
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Patent number: 7409121Abstract: A proposed integrateable optical interleaver includes an input Y-branch coupler and at least two multi-section optical couplers. The multi-section optical couplers of the interleaver include at least three substantially similar optical couplers, adjacent ones of the optical couplers interconnected via at least one set of waveguides. The interleaver of the present invention comprises a highly compact and fabrication-robust form that is capable of being integrated onto a single planar lightwave circuit.Type: GrantFiled: November 30, 2006Date of Patent: August 5, 2008Assignee: Lucent Technologies Inc.Inventors: Christopher Richard Doerr, David S. Levy
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Patent number: 7362979Abstract: An apparatus and method are provided for transmitting an optical duobinary signal using a low bandwidth modulator having a bandwidth of less than about 60% of the transmission bit rate of the transmitter. The modulator is adapted to provide low pass filtering for low pass filtered duobinary transmission in an optical fiber transmission system having residual dispersion.Type: GrantFiled: January 31, 2003Date of Patent: April 22, 2008Assignee: Lucent Technologies Inc.Inventors: Douglas M. Gill, David S. Levy, Xiang Liu, Moncef B. Tayahi, Xing Wei
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Patent number: 7362980Abstract: An optical duobinary transmission system and method are provided for transmitting optical duobinary signals across an optical transmission link having residual dispersion. The system includes a transmitter having a low bandwidth modulator, adapted to provide filtering for low pass filtered duobinary transmission. The transmission link is designed such that the residual dispersion of the transmission link substantially compensates for signal distortion from the transmitter.Type: GrantFiled: January 31, 2003Date of Patent: April 22, 2008Assignee: Lucent Technologies Inc.Inventors: Douglas M. Gill, David S. Levy, Xiang Liu, Moncef B. Tayahi, Xing Wei
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Patent number: 7171116Abstract: A dual-output Mach-Zehnder modulator (MZM2) and configurations of optical transmitters based on the MZM2 which obviate the optical splitter that is typically used to provide keep-alive functionality in redundantly-connected, protected optical networks, SONET add-drop multiplexers, and optical IP routers. The configurations provide equivalent keep-alive utility at a reduced system cost relative to the prior art. The configurations also support enhanced Operations, Administration, Maintenance, and Provisioning (OAM&P) functionality at little to no additional cost relative to the prior art. Instead of being a direct copy of the service signal, the keep-alive of this configuration is an inverted version of the service signal. This inverted version of the service signal is supported at a client by utilization of means for detecting and righting the inverted signal.Type: GrantFiled: September 17, 2002Date of Patent: January 30, 2007Assignee: Lucent Technologies Inc.Inventors: Steven K. Korotky, David S. Levy
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Patent number: 7171067Abstract: A proposed integrateable optical interleaver includes an input Y-branch coupler and at least two multi-section optical couplers. The multi-section optical couplers of the interleaver include at least three substantially similar optical couplers, adjacent ones of the optical couplers interconnected via at least one set of waveguides. The interleaver of the present invention comprises a highly compact and fabrication-robust form that is capable of being integrated onto a single planar lightwave circuit.Type: GrantFiled: September 9, 2003Date of Patent: January 30, 2007Assignee: Lucent Technologies Inc.Inventors: Christopher Richard Doerr, David S. Levy
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Patent number: 7155123Abstract: Method and apparatus for fault localization in an optical network using time trend correlation of end node performance parameters and intermediate node performance parameters, such as QoS and quasi-Q factors, respectively. The method and apparatus are bit-rate and protocol independent, enabling testing for each channel of a diverse dense wavelength division multiplexed traffic system using a single set of hardware.Type: GrantFiled: May 10, 2002Date of Patent: December 26, 2006Assignee: Lucent Technologies Inc.Inventors: David S. Levy, Peter H. Mitev
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Patent number: 7099582Abstract: A method and apparatus for optical performance monitoring that provides for multi-rate and multi-protocol monitoring includes, identifying a protocol associated with each of a plurality of communication signals using respective data rates extracted therefrom, determining, for each of the plurality of communication signals, a respective bit-error rate (BER), and generating an alarm indicative of BER excursions beyond a protocol appropriate BER threshold level.Type: GrantFiled: May 31, 2002Date of Patent: August 29, 2006Assignee: Lucent Technologies Inc.Inventors: Chedley Belhadj-Yahya, David S. Levy
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Patent number: 6792172Abstract: The Multimode Interference coupler according to the invention has smoothly continuous inwardly tapered sidewalls (301) which define the width of the multimode region (W1) along the propagation axis of the device. The inward taper causes the average width of the device to be reduced in comparison to known couplers having straight sidewalls (202). Further, invention allows the access waveguides (303, 309) to remain sufficiently spaced, while reducing the overall length of the device, to avoid lithographic gap fill-in and unwanted optical coupling between the waveguides.Type: GrantFiled: April 20, 2001Date of Patent: September 14, 2004Assignee: The Trustees of Columbia University of the City of New YorkInventors: David S. Levy, Robert Scarmozzino, Richard M. Osgood, Jr.
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Publication number: 20040151512Abstract: An optical duobinary transmission system and method are provided for transmitting optical duobinary signals across an optical transmission link having residual dispersion. The system includes a transmitter having a low bandwidth modulator, adapted to provide filtering for low pass filtered duobinary transmission. The transmission link is designed such that the residual dispersion of the transmission link substantially compensates for signal distortion from the transmitter.Type: ApplicationFiled: January 31, 2003Publication date: August 5, 2004Inventors: Douglas M. Gill, David S. Levy, Xiang Liu, Moncef B. Tayahi, Xing Wei
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Publication number: 20040151511Abstract: An apparatus and method are provided for transmitting an optical duobinary signal using a low bandwidth modulator having a bandwidth of less than about 60% of the transmission bit rate of the transmitter. The modulator is adapted to provide low pass filtering for low pass filtered duobinary transmission in an optical fiber transmission system having residual dispersion.Type: ApplicationFiled: January 31, 2003Publication date: August 5, 2004Inventors: Douglas M. Gill, David S. Levy, Xiang Liu, Moncef B. Tayahi, Xing Wei
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Patent number: 6766113Abstract: A facility is provided to allow a supervisory message to quickly propagate through a transmission network without delay. Specifically, a supervisory message is quickly routed from one node to a next node by (a) splitting the control channel signal carrying the supervisory message at a receiving node, (b) sending one of the split control channel signals to an output via switchable apparatus for immediate transmission the next node and (c) sending the other split signal to a controller for analysis. If the controller invokes a predetermined procedure as a result of the content of the message, e.g., invokes protection switching, then the controller forms a supervisory message identifying the invoked procedure, operates the switchable apparatus so that the message identifying the invoked procedure may be routed to the output in place of the split channel signal message.Type: GrantFiled: June 16, 2000Date of Patent: July 20, 2004Assignee: Lucent Technologies Inc.Inventors: Daniel Y. Al-Salameh, Mario F. Alvarez, David S. Levy, Jithamithra Sarathy, Anastasios Tzathas
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Patent number: 6721502Abstract: An optical transmission system formed from a plurality of nodes interconnected in a ring configuration via at least two transmission media provides protection capacity for each optical channel. If a channel signal does not meet predetermined criteria, then a loss of signal indication is declared for the channel and one of a plurality of protection switching states is invoked to re-route service traffic carried by the impaired channel to its destination via corresponding protection capacity. The switching states include particular transmission states and at least “keep-alive” and “protection access” states.Type: GrantFiled: September 30, 2000Date of Patent: April 13, 2004Assignee: Lucent Technologies Inc.Inventors: Daniel Y. Al-Salameh, Donald L. Husa, David S. Levy, Timothy O. Murphy, Gaylord W. Richards
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Publication number: 20040052518Abstract: A dual-output Mach-Zehnder modulator (MZM2) and configurations of optical transmitters based on the MZM2 which obviate the optical splitter that is typically used to provide keep-alive functionality in redundantly-connected, protected optical networks, SONET add-drop multiplexers, and optical IP routers. The configurations provide equivalent keep-alive utility at a reduced system cost relative to the prior art. The configurations also support enhanced Operations, Administration, Maintenance, and Provisioning (OAM&P) functionality at little to no additional cost relative to the prior art. Instead of being a direct copy of the service signal, the keep-alive of this configuration is an inverted version of the service signal. This inverted version of the service signal is supported at a client by utilization of means for detecting and righting the inverted signal.Type: ApplicationFiled: September 17, 2002Publication date: March 18, 2004Inventors: Steven K. Korotky, David S. Levy
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Publication number: 20040042795Abstract: An integrated reconfigurable planar lightwave add-drop (RPLAD) multiplexer for use in a WDM optical communication system is arranged such that each drop port can receive any wavelength channel and each add port can transmit on any wavelength channel. Drop port reconfigurability is achieved by integrating a cross-connect functionality into the RPLAD, illustratively using optical 1×2 switches to perform “space” switching. The switches are controlled from a remotely located node controller. Add port reconfigurability is achieved by having tunable lasers and a wavelength independent optical power combiner, which may be a star coupler that is integrated with the other above-mentioned elements.Type: ApplicationFiled: August 27, 2002Publication date: March 4, 2004Inventors: Christopher Richard Doerr, David S. Levy, Timothy O. Murphy, Alice Elizabeth White
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Publication number: 20030223746Abstract: A method and apparatus for optical performance monitoring that provides for multi-rate and multi-protocol monitoring includes, identifying a protocol associated with each of a plurality of communication signals using respective data rates extracted therefrom, determining, for each of the plurality of communication signals, a respective bit-error rate (BER), and generating an alarm indicative of BER excursions beyond a protocol appropriate BER threshold levelType: ApplicationFiled: May 31, 2002Publication date: December 4, 2003Applicant: LUCENT TECHNOLOGIES INC.Inventors: Chedly Belhadj-Yahya, David S. Levy
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Publication number: 20030210908Abstract: Method and apparatus for fault localization in an optical network using time trend correlation of end node performance parameters and intermediate node performance parameters, such as QoS and quasi-Q factors, respectively. The method and apparatus are bit-rate and protocol independent, enabling testing for each channel of a diverse dense wavelength division multiplexed traffic system using a single set of hardware.Type: ApplicationFiled: May 10, 2002Publication date: November 13, 2003Applicant: LUCENT TECHNOLOGIES INC.Inventors: David S. Levy, Peter H. Mitev