Patents by Inventor Mohan Gurunathan
Mohan Gurunathan 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: 20220219172Abstract: Digital microfluidic (DMF) methods and apparatuses (including devices, systems, cartridges, DMF readers, etc.), and in particular DMF apparatuses and methods that may be used to safely manually add or remove fluid within a cartridge while it is actively applying DMF. Also described herein are DMF readers for use with a DMF cartridges, including those including multiple and/or redundant safety interlocks. Also described herein are DMF reader devices having a cover with active control of microfluidics on the cover while actively controlling DMF on the reader base.Type: ApplicationFiled: February 28, 2020Publication date: July 14, 2022Applicant: MIROCULUS INC.Inventors: Jorge Abraham SOTO-MORENO, Mais Jehan JEBRAIL, Alejandro TOCIGL, Foteini CHRISTODOULOU, Carl David MARTIN, Morgan Marin WATSON, Rohit LAL, Joshua SHEN, Ronan Barry HAYES, Gregory Arthur RAY, Peter Tirtowijoyo YOUNG, Spencer Todd SEILER, Ik Pyo HONG, Mohan GURUNATHAN, Lubomir DALTCHEV, Rodolfo WILHELMY-PRECIADO, Juan Matias de CARLI, Jobelo Andres Quintero RODRÍGUEZ, Matias Jorge LESCANO
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Patent number: 7265849Abstract: In one embodiment, a method determines the spectral content of an optical signal. Specifically, the optical signal and an optical local oscillator (LO) signal are provided to inputs of an optical hybrid (e.g., an N×N optical coupler where N is greater than two). The phase-diverse components from the optical hybrid are photodetected allowing for mixing of the optical signal and the optical local oscillator. Bandpass filtering is performed to eliminate or reduce relative intensity noise (RIN). The filtered signals are mixed with an electrical LO signal. A quadrature representation of a phase-diverse heterodyne signal is generated from signals from the mixing. The negative image and the positive image from the quadrature representation are separated. The spectral content of the optical signal is determined from the images.Type: GrantFiled: September 25, 2003Date of Patent: September 4, 2007Assignee: Agilent Technologies, Inc.Inventors: Mohan Gurunathan, William Ian McAlexander, Tun S. Tan
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Patent number: 7106449Abstract: An optical fiber device with reduced thermal sensitivity comprises a first optical fiber arm having a first composite coefficient of thermal expansion and a first length and a second optical fiber arm having a second composite coefficient of thermal expansion and a second length. A ratio of the first and second lengths inversely matches a ratio of the first and second composite coefficients of thermal expansion to minimize thermal sensitivity in the device.Type: GrantFiled: May 30, 2003Date of Patent: September 12, 2006Assignee: Agilent Technologies, Inc.Inventors: Mohan Gurunathan, Richard D. Pering, Bogdan Szafraniec
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Patent number: 7068374Abstract: A phase-diverse coherent optical spectrum analyzer is presented. An optical receiver receives a first input signal and a second input signal, and produces at least a first output signal, a second output signal, and a third output signal based on mixing the first input signal and the second input signal. A processing unit isolates heterodyne components from the first output signal, the second output signal and the third output signal, wherein the heterodyne components comprise a first signal and a second signal that represent the phase-diverse nature of the optical mixing process. Phase diversity of the heterodyning between the first input signal and the second input signal is achieved by the coherent optical spectrum analyzer.Type: GrantFiled: June 9, 2003Date of Patent: June 27, 2006Assignee: Agilent Technologies, Inc.Inventors: Mohan Gurunathan, William I. McAlexander, Richard D. Pering
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Publication number: 20050068533Abstract: In one embodiment, a method determines the spectral content of an optical signal. Specifically, the optical signal and an optical local oscillator (LO) signal are provided to inputs of an optical hybrid (e.g., an N×N optical coupler where N is greater than two). The phase-diverse components from the optical hybrid are photodetected allowing for mixing of the optical signal and the optical local oscillator. Bandpass filtering is performed to eliminate or reduce relative intensity noise (RIN). The filtered signals are mixed with an electrical LO signal. A quadrature representation of a phase-diverse heterodyne signal is generated from signals from the mixing. The negative image and the positive image from the quadrature representation are separated. The spectral content of the optical signal is determined from the images.Type: ApplicationFiled: September 25, 2003Publication date: March 31, 2005Inventors: Mohan Gurunathan, William McAlexander, Tun Tan
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Publication number: 20040246491Abstract: A phase-diverse coherent optical spectrum analyzer is presented. An optical receiver receives a first input signal and a second input signal, and produces at least a first output signal, a second output signal, and a third output signal based on mixing the first input signal and the second input signal. A processing unit isolates heterodyne components from the first output signal, the second output signal and the third output signal, wherein the heterodyne components comprise a first signal and a second signal that represent the phase-diverse nature of the optical mixing process. Phase diversity of the heterodyning between the first input signal and the second input signal is achieved by the coherent optical spectrum analyzer.Type: ApplicationFiled: June 9, 2003Publication date: December 9, 2004Inventors: Mohan Gurunathan, William I. McAlexander, Richard D. Pering
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Publication number: 20040239940Abstract: An optical fiber device with reduced thermal sensitivity comprises a first optical fiber arm having a first composite coefficient of thermal expansion and a first length and a second optical fiber arm having a second composite coefficient of thermal expansion and a second length. A ratio of the first and second lengths inversely matches a ratio of the first and second composite coefficients of thermal expansion to minimize thermal sensitivity in the device.Type: ApplicationFiled: May 30, 2003Publication date: December 2, 2004Inventors: Mohan Gurunathan, Richard D. Pering, Bogdan Szafraniec
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Patent number: 6707025Abstract: A high dynamic range receiver includes a detector that produces a current at a pair of terminals. A first gain element, implemented as a current-to-voltage converter for example, is coupled to the first terminal, receiving the current and generating a first output signal corresponding to the current. A second gain element, implemented as a current-to-voltage converter for example, is coupled to the second terminal, receiving the current and generating a second output signal corresponding to the received current. A switch selectively couples the first output signal or the second output signal to a port based on a comparison of at least one of the first output signal and the second output signal to a threshold.Type: GrantFiled: June 4, 2002Date of Patent: March 16, 2004Assignee: Agilent Technologies, Inc.Inventors: Zoltan D Azary, Joseph N West, Mohan Gurunathan
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Publication number: 20030222206Abstract: A high dynamic range receiver includes a detector that produces a current at a pair of terminals. A first gain element, implemented as a current-to-voltage converter for example, is coupled to the first terminal, receiving the current and generating a first output signal corresponding to the current. A second gain element, implemented as a current-to-voltage converter for example, is coupled to the second terminal, receiving the current and generating a second output signal corresponding to the received current. A switch selectively couples the first output signal or the second output signal to a port based on a comparison of at least one of the first output signal and the second output signal to a threshold.Type: ApplicationFiled: June 4, 2002Publication date: December 4, 2003Inventors: Zoltan D. Azary, Joseph N. West, Mohan Gurunathan
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Patent number: 6548802Abstract: A zero calibration system and method for an optical receiver include an illuminated photodetector, switchably coupled to an amplifier. The photodetector is de-coupled from the amplifier while illumination of the photodetector is maintained and an error signal is measured at the output of the amplifier The photodetector is then coupled to the amplifier and subsequent signals measured at the output of the amplifier are corrected according to the measured error signal, based on a comparison of the relative values of a feedback resistor, coupled between the output and an input of the amplifier, and an equivalent resistance of the photodetector. When the ratio of the feedback resistor to the equivalent resistance does not exceed a predetermined threshold, the subsequently measured signals at the output of the amplifier are corrected by offsetting the subsequently measured signals by the measured error signal.Type: GrantFiled: April 20, 2001Date of Patent: April 15, 2003Assignee: Agilent Technologies, Inc.Inventors: Mohan Gurunathan, Zoltan D. Azary, Greg C. Richtenburg
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Publication number: 20020153475Abstract: A zero calibration system and method for an optical receiver include an illuminated photodetector, switchably coupled to an amplifier. The photodetector is de-coupled from the amplifier while illumination of the photodetector is maintained and an error signal is measured at the output of the amplifier The photodetector is then coupled to the amplifier and subsequent signals measured at the output of the amplifier are corrected according to the measured error signal, based on a comparison of the relative values of a feedback resistor, coupled between the output and an input of the amplifier, and an equivalent resistance of the photodetector. When the ratio of the feedback resistor to the equivalent resistance does not exceed a predetermined threshold, the subsequently measured signals at the output of the amplifier are corrected by offsetting the subsequently measured signals by the measured error signal.Type: ApplicationFiled: April 20, 2001Publication date: October 24, 2002Inventors: Mohan Gurunathan, Zoltan D. Azary, Greg C. Richtenburg