Patents by Inventor Sandeep T. Vohra
Sandeep T. Vohra 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: 9094149Abstract: An arrangement is provided for transporting information from a central information distribution center (CIDC) to locations where such information is intended. Upon receiving a request for narrowcast information to be delivered to a node associated with a head end, the CIDC selects the requested information, generates an optical signal encoded with the requested information using information channels dedicated to narrowcast information transport for the node, and sends the optical signal to the head end via an optical fiber. When the head end receives the optical signal, the narrowcast information transport channels dedicated to the node are translated into subcarriers acceptable to the node before the requested narrowcast information is forwarded to the node.Type: GrantFiled: October 4, 2011Date of Patent: July 28, 2015Assignee: ARRIS Enterprises, Inc.Inventors: Irl N. Duling, Sandeep T. Vohra, Paul J. Matthews
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Patent number: 8032016Abstract: An arrangement is provided for transporting information from a central information distribution center (CIDC) to locations where such information is intended. Upon receiving a request for narrowcast information to be delivered to a node associated with a head end, the CIDC selects the requested information, generates an optical signal encoded with the requested information using information channels dedicated to narrowcast information transport for the node, and sends the optical signal to the head end via an optical fiber. When the head end receives the optical signal, the narrowcast information transport channels dedicated to the node are translated into subcarriers acceptable to the node before the requested narrowcast information is forwarded to the node.Type: GrantFiled: February 13, 2003Date of Patent: October 4, 2011Assignee: ARRIS Group, Inc.Inventors: Irl N. Duling, Sandeep T. Vohra, Paul J. Matthews
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Patent number: 7196840Abstract: Arrangements are provided for an amplitude balanced optical amplifier. A combination of an optical preamplifier and a gain/loss variation modification device (VMD) is employed. The gain/loss VMD compensates the gain variation across different wavelength channels introduced by the preamplifier. The gain/loss VMD operates based on a gain/loss profile that is complementary to that of the preamplifier. More than one amplifier may be deployed. In addition, feedback control may be applied to either the preamplifier or the gain/loss VMD to dynamically control the performance.Type: GrantFiled: November 25, 2002Date of Patent: March 27, 2007Assignee: Broadband Royalty CorporationInventors: Irl N. Duling, Sandeep T. Vohra, Paul J. Matthews
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Patent number: 7127182Abstract: A transmitter for optical communication systems includes a source of optical radiation, a source of complex non-information signals, and a modulator unit in communication with the source of optical radiation. The modulator unit is also in communication with the source of complex non-information signals. The modulator has an input adapted to receive information-bearing signals.Type: GrantFiled: October 16, 2002Date of Patent: October 24, 2006Assignee: Broadband Royalty Corp.Inventors: Paul J. Matthews, Paul D. Biernacki, Sandeep T. Vohra
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Patent number: 6959153Abstract: An add-drop multiplexer is described, in one embodiment the add-drop multiplexer includes an optical transmission signal input port adapted to receive a wavelength division multiplexed optical transmission signal, an optical transmission signal output port adapted to output at least a portion of the wavelength division multiplexed optical transmission signal, an add-drop optical channel port adapted to receive an optical add channel and output an optical drop channel, and a wavelength selective optical filter arranged between the optical transmission signal input port, the optical transmission signal output port and the optical add-drop channel port. The wavelength selective optical filter reflects optical channels that will continue through the add-drop multiplexer along a transmission line to the optical transmission signal output port and permits an optical channel that is to be dropped to pass therethrough.Type: GrantFiled: December 20, 2001Date of Patent: October 25, 2005Assignee: Broadband Royalty CorporationInventor: Sandeep T. Vohra
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Patent number: 6944372Abstract: A tunable dispersion compensating device for optical communications systems has a compliant support block having a longitudinal axis and a load-receiving surface oriented substantially parallel to the longitudinal axis. The load receiving surface is suitable to receive an applied load in a direction substantially orthogonal to the longitudinal axis. A Bragg-grating fiber is disposed in the compliant support block and extends substantially along, and at an angle to, the longitudinal axis of the compliant support block.Type: GrantFiled: September 21, 2001Date of Patent: September 13, 2005Assignee: Broadband Royalty CorporationInventors: Evelyn Boettcher, Sandeep T. Vohra, Gregg Johnson
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Publication number: 20040190828Abstract: A wavelength tunable filter for optical communication systems has an optical fiber containing a Bragg grating disposed within a compliant support block. A length of the fiber is wrapped in a spiral of fixed pitch around the longitudinal axis of a cylindrical polymer support block. The support block is placed within a support frame to which a micrometer screw assembly is attached and oriented to apply a variable mechanical load substantially parallel to the longitudinal axis of the cylindrical support block. Application of the load introduces a strain on the support block, changing the period of the refractive index in the fiber Bragg grating with a resulting shift in the Bragg reflection peak.Type: ApplicationFiled: April 12, 2004Publication date: September 30, 2004Applicant: Optinel Systems, Inc.Inventors: Evelyn Boettcher, Sandeep T. Vohra, Paul J. Matthews, Paul D. Biernacki
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Patent number: 6744035Abstract: A passive, temperature compensated tunable filter calibration device in a Bragg-grating interrogation system. The invention comprises two systems: 1) a dual substrate Bragg grating calibration system, the temperature of an array of gratings is estimated using an array of gratings bonded to a common host substrate and a single grating bonded to a material with a different coefficient of thermal expansion; 2) a hydrogen cyanide wavelength reference absorption cell that absorbs light at discrete wavelengths corresponding to the molecular vibration mode frequencies of the gas. A first photodetector sees the transmission spectrum and a second sees the reflections from Bragg gratings in a sensing array. In this system there is no temperature compensation step as the absorption lines are not sensitive to temperature.Type: GrantFiled: January 17, 2003Date of Patent: June 1, 2004Assignee: The United States of America as represented by the Secretary of the NavyInventors: Gregg A. Johnson, Bryan L. Althouse, Greg Nau, Sandeep T. Vohra
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Patent number: 6744986Abstract: A tunable wavelength add/drop (t-WDM) device utilizes a multiwavelength input (which serves as a data input port), a low loss optical circulator or an optical coupler, a wavelength division de-multiplexer which splits the input multi-wavelength data stream into itsd individual components, a modified multi-channel DOS, a telecommunications grade optical fiber, and a wavelength multiplexer for adding optical data channels. The input multi-wavelength data stream from a network is sent to a wavelength de-multiplexer where it is demultiplexed into individual wavelengths which are applied to an array of Y-branch digital optical switching devices controlled by a computer. If a specific wavelength is to be dropped, it is diverted towards a branch of a given switch which has a fiber pig tail attached.Type: GrantFiled: June 30, 2000Date of Patent: June 1, 2004Assignee: The United States of America as represented by the Secretary of the NavyInventor: Sandeep T. Vohra
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Patent number: 6738536Abstract: A wavelength tunable filter for optical communication systems has an optical fiber containing a Bragg grating disposed within a compliant support block. A length of the fiber is wrapped in a spiral of fixed pitch around the longitudinal axis of a cylindrical polymer support block. The support block is placed within a support frame to which a micrometer screw assembly is attached and oriented to apply a variable mechanical load substantially parallel to the longitudinal axis of the cylindrical support block. Application of the load introduces a strain on the support block, changing the period of the refractive index in the fiber Bragg grating with a resulting shift in the Bragg reflection peak.Type: GrantFiled: December 20, 2001Date of Patent: May 18, 2004Assignee: Optinel Systems, Inc.Inventors: Evelyn Boettcher, Sandeep T. Vohra, Paul J. Matthews, Paul D. Biernacki
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Publication number: 20030218124Abstract: A passive, temperature compensated tunable filter calibration device for a Bragg grating interrogation system. In a first system, a dual-substrate Bragg grating calibration system, the temperature of an array of gratings is estimated using an array of gratings bonded to a common host substrate and a single grating bonded to a material with a different coefficient of thermal expansion. Changes in a common temperature of the substrates is measured by monitoring the difference between shifts of grating wavelength. As a filter voltage is scanned from its lowest to its highest voltage, the voltages are recorded. The second lowest wavelength corresponds to the grating attached to the differing substrate. The voltages are used to calculate a voltage-to-wavelength function for the scanning range of the filter. To compensate for variations in a calibration curve and temperature variations of the calibration array, the temperature is estimated and function re-calculated at every pass of the scanning filter.Type: ApplicationFiled: January 17, 2003Publication date: November 27, 2003Inventors: Gregg A. Johnson, Bryan L. Althouse, Greg Nau, Sandeep T. Vohra
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Publication number: 20030161634Abstract: Arrangements are provided for optical transport of data. A scalable data transport system has an optical transmission system having a reconfigurable bit rate; an optical transmission fiber in communication with the optical transmission system; and an optical receiver system in communication with the optical transmission fiber. The optical transmission system is adapted to modulate an optical carrier with a subcarrier-multiplexed RF signal, and the subcarrier-multiplexed RF signal comprises a selectable plurality of RF signals that can be selected to configure a bit rate of the optical transmitter and reselected to reconfigure the bit rate of said optical transmitter.Type: ApplicationFiled: December 16, 2002Publication date: August 28, 2003Inventors: James J. Costabile, Sandeep T. Vohra, Paul J. Matthews, Irl N. Duling
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Patent number: 6611633Abstract: This invention pertains to a sensor comprising of glass optical fiber, a cellular pressure release material surrounding the fiber, and means for determining responsivity of the sensor, the sensor having responsivity of at least about −160 dB re rad/m-&mgr;/Pa, which corresponds to sensitivity of about 50 times better than prior art. The sensor can be made part of an optical interferometer which is characterized by splitting of an entering light beam and measurement of an optical phase shift caused by light traversing different paths. The sensor can form a part of a fiber Bragg grating geometry characterized by a fiber Bragg grating in the glass fiber covered by the cellular pressure release material wherein shift of the Bragg wavelength induced by strain on to the cellular pressure release material is measured.Type: GrantFiled: March 24, 2000Date of Patent: August 26, 2003Assignee: The United States of America as represented by the Secretary of the NavyInventors: Sandeep T. Vohra, Anthony Dandridge, Alan B. Tveten
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Publication number: 20030152386Abstract: Arrangements are provided for multi-format information optical transport. A multi-format optical signal transport generator is designed to generate a multi-format optical signal based on information in different formats from heterogeneous information sources. Such generated multi-format optical signal is optically transported via an optical fiber. Upon receiving the optical at a receiving end, a multi-format optical signal transport receiver decodes the multi-format optical signal to recover the information of different formats.Type: ApplicationFiled: December 3, 2002Publication date: August 14, 2003Inventors: Sandeep T. Vohra, Paul J. Matthews, Irl N. Duling
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Publication number: 20030152387Abstract: An optical communication system has an optical transmitter, an optical transmission line in optical communication with the optical transmitter, an optical receiver in optical communication with the optical transmission line, and a dispersion compensator disposed between the optical transmitter and the optical receiver along the optical transmission line. The optical transmitter is adapted to transmit an optical signal that includes multilevel encoding. The optical transmission line causes a first dispersion of the optical signal and the dispersion compensator causes a second dispersion of the optical signal. The second dispersion at least partially cancels the first dispersion.Type: ApplicationFiled: December 3, 2002Publication date: August 14, 2003Inventors: Irl N. Duling, Sandeep T. Vohra, Paul J. Matthews
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Publication number: 20030147127Abstract: Arrangements are provided for an amplitude balanced optical amplifier. A combination of an optical preamplifier and a gain/loss variation modification device (VMD) is employed. The gain/loss VMD compensates the gain variation across different wavelength channels introduced by the preamplifier. The gain/loss VMD operates based on a gain/loss profile that is complementary to that of the preamplifier. More than one amplifier may be deployed. In addition, feedback control may be applied to either the preamplifier or the gain/loss VMD to dynamically control the performance.Type: ApplicationFiled: November 25, 2002Publication date: August 7, 2003Inventors: Irl N. Duling, Sandeep T. Vohra, Paul J. Matthews
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Publication number: 20030128924Abstract: A wavelength tunable filter for optical communication systems has an optical fiber containing a Bragg grating disposed within a compliant support block. A length of the fiber is wrapped in a spiral of fixed pitch around the longitudinal axis of a cylindrical polymer support block. The support block is placed within a support frame to which a micrometer screw assembly is attached and oriented to apply a variable mechanical load substantially parallel to the longitudinal axis of the cylindrical support block. Application of the load introduces a strain on the support block, changing the period of the refractive index in the fiber Bragg grating with a resulting shift in the Bragg reflection peak.Type: ApplicationFiled: December 20, 2001Publication date: July 10, 2003Applicant: Optinel Systems, Inc.Inventors: Evelyn Boettcher, Sandeep T. Vohra, Paul J. Matthews, Paul D. Biernacki
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Patent number: 6580855Abstract: A bandwidth tunable fiber Bragg grating (FBG) device performs tuning in an optical transmission circuit by placing a grating in a compliant material, which is transversely loaded to create longitudinal strain through the Poisson effect of materials. Careful application of various load magnitudes along the length of the grating through the compliant material creates a strain gradient along the length of the grating, which chirps the grating thus resulting in altering the bandwidth of the grating. Tuning the grating bandwidth results, effectively, in tuning the dispersion of light being reflected off the grating. Insertion of such a device in the optical link allows for dynamic dispersion compensation in the link. The ability of the device to ‘dial-in’ a desired amount of dispersion is what makes it valuable.Type: GrantFiled: October 10, 2000Date of Patent: June 17, 2003Assignee: The United States of America as represented by the Secretary of the NavyInventors: Sandeep T. Vohra, Chia Chen Chang, Bryan Althouse
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Patent number: 6573489Abstract: A passive, temperature compensated tunable filter calibration device for a Bragg grating interrogation system. In a first system, a dual-substrate Bragg grating calibration system, the temperature of an array of gratings is estimated using an array of gratings bonded to a common host substrate and a single grating bonded to a material with a different coefficient of thermal expansion. Changes in a common temperature of the substrates is measured by monitoring the difference between shifts of grating wavelength. As a filter voltage is scanned from its lowest to its highest voltage, the voltages are recorded. The second lowest wavelength corresponds to the grating attached to the differing substrate. The voltages are used to calculate a voltage-to-wavelength function for the scanning range of the filter. To compensate for variations in a calibration curve and temperature variations of the calibration array, the temperature is estimated and function re-calculated at every pass of the scanning filter.Type: GrantFiled: August 9, 2000Date of Patent: June 3, 2003Assignee: The United States of America, as represented by the Secretary of the NavyInventors: Gregg A. Johnson, Bryan L. Althouse, Greg Nau, Sandeep T. Vohra
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Publication number: 20030076567Abstract: A transmitter for optical communication systems includes a source of optical radiation, a source of complex non-information signals, and a modulator unit in communication with the source of optical radiation. The modulator unit is also in communication with the source of complex non-information signals. The modulator has an input adapted to receive information-bearing signals.Type: ApplicationFiled: October 16, 2002Publication date: April 24, 2003Inventors: Paul J. Matthews, Paul D. Biernacki, Sandeep T. Vohra