Patents by Inventor Guangning Yang
Guangning Yang 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).
-
Patent number: 11693148Abstract: A satellite includes a fast tracking mirror (“mirror”) placed at or near center of mass (CoM) of the satellite along a line of sight between the CoMs of two satellites. The satellite also includes a detector at a distance away from the mirror. The mirror is adjusted to maintain the distance between the mirror and the detector, when a location of the detector changes due to pitch and yaw of the satellite.Type: GrantFiled: August 6, 2019Date of Patent: July 4, 2023Assignee: United States of America as represented by the Administrator of NASAInventors: Guangning Yang, Jeffrey Chen
-
Patent number: 11493602Abstract: A photonic, integrated circuit chip can have a frequency comb laser configured to generate a plurality of wavelengths, a plurality of modulators, one respective modulator for each wavelength of the plurality of wavelengths, the plurality of modulators being aligned in series with each of the plurality of modulators being tuned to a respective one of the wavelengths of the plurality of wavelengths, a connector configured to convey a drive signal for each modulator of the plurality of modulators, a semiconductor optical amplifier configured to receive light exiting from the plurality of modulators, and a chip having present thereon the frequency comb laser, the plurality of modulators, and the semiconductor optical amplifier. The plurality of modulators can be configured to produce a single beam of time-interleaved, multiple-wavelength output laser light. A mobile system, such as a satellite, can also have the photonic, integrated circuit chip as a component thereof.Type: GrantFiled: April 30, 2020Date of Patent: November 8, 2022Assignee: United States of America as represented by the Administrator of NASAInventors: Guangning Yang, Jeffrey Chen
-
Patent number: 10228465Abstract: An apparatus for improving a pointing capability of an optical pointing system includes a star tracker attitude control system for maintaining an alignment between the optical pointing system and a target, a beam steering mirror controlled by the star tracker attitude control system to direct an optical signal to impinge on the target, a fixed optical assembly configured to direct a portion of the optical signal from the bean steering mirror into a field of view of a star tracker telescope of the star tracker attitude control system, and a detector array for detecting the portion of the optical signal superimposed over a location in a current star scene in the star tracker telescope field of view, where the star tracker attitude control system is configured to operate the beam steering mirror to maintain the optical signal on the target by maintaining the superimposed signal on the location in the star scene.Type: GrantFiled: June 14, 2017Date of Patent: March 12, 2019Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space AdministrationInventors: Guangning Yang, Jeffrey R. Chen
-
Publication number: 20180364359Abstract: An apparatus for improving a pointing capability of an optical pointing system includes a star tracker attitude control system for maintaining an alignment between the optical pointing system and a target, a beam steering mirror controlled by the star tracker attitude control system to direct an optical signal to impinge on the target, a fixed optical assembly configured to direct a portion of the optical signal from the bean steering mirror into a field of view of a star tracker telescope of the star tracker attitude control system, and a detector array for detecting the portion of the optical signal superimposed over a location in a current star scene in the star tracker telescope field of view, where the star tracker attitude control system is configured to operate the beam steering mirror to maintain the optical signal on the target by maintaining the superimposed signal on the location in the star scene.Type: ApplicationFiled: June 14, 2017Publication date: December 20, 2018Inventors: Guangning Yang, Jeffrey R. Chen
-
Patent number: 10148352Abstract: An apparatus for measuring a distance between a first and second terminal includes a frame counter for determining a number of data frames traversing a distance between the first terminal 105 and the second terminal, a frame bit counter for determining a number of data clock bits offset between a transmitted data frame and a concurrently received data frame, a data clock phase detector for determining a phase difference between an RF data clock for the transmitted data frame and an RF data clock for the concurrently received data frame, and an optical carrier phase detector for determining a phase difference between an optical carrier used to transmit the transmitted data frame and an optical carrier for the concurrently received data frame. The distance between the first and second terminal is determined from a round trip transit time T between the first and second terminals.Type: GrantFiled: July 11, 2017Date of Patent: December 4, 2018Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space AdministrationInventors: Guangning Yang, Jeffrey R. Chen
-
Patent number: 9264134Abstract: A communication system may include a first control circuit to detect a break on a first optical link; a first optical source to supply a first optical signal on a second optical link in response to detecting the break on the first optical link, the first optical signal propagating in a first direction on the second optical link; a second control circuit to detect a presence of the first optical signal on the second optical link, and output a control signal in response to detecting the presence of the first optical signal; and a second optical source to supply a second optical signal on the second optical link, the second optical signal propagating in a second direction opposite the first direction, where the Raman pump is disabled in response to the control signal.Type: GrantFiled: September 29, 2008Date of Patent: February 16, 2016Assignee: Infinera CorporationInventors: David Kerr, Mark LaLiberte, Avery Van Gieson, John Lai, Kim Jepsen, Wei Lu, Yan Han, Marc Placidet, Ulrik Gliese, David Copeland, Guangning Yang
-
Patent number: 9065242Abstract: An apparatus and method is provided to enable precision and fast laser frequency tuning. For instance, a fast tunable slave laser may be dynamically offset-locked to a reference laser line using an optical phase-locked loop. The slave laser is heterodyned against a reference laser line to generate a beatnote that is subsequently frequency divided. The phase difference between the divided beatnote and a reference signal may be detected to generate an error signal proportional to the phase difference. The error signal is converted into appropriate feedback signals to phase lock the divided beatnote to the reference signal. The slave laser frequency target may be rapidly changed based on a combination of a dynamically changing frequency of the reference signal, the frequency dividing factor, and an effective polarity of the error signal. Feed-forward signals may be generated to accelerate the slave laser frequency switching through laser tuning ports.Type: GrantFiled: May 17, 2012Date of Patent: June 23, 2015Assignee: The United States of America as represented by the Administrator of the National Aeronautics Space AdministrationInventors: Jeffrey R. Chen, Kenji Numata, Stewart T. Wu, Guangning Yang
-
Publication number: 20130308663Abstract: An apparatus and method is provided to enable precision and fast laser frequency tuning. For instance, a fast tunable slave laser may be dynamically offset-locked to a reference laser line using an optical phase-locked loop. The slave laser is heterodyned against a reference laser line to generate a beatnote that is subsequently frequency divided. The phase difference between the divided beatnote and a reference signal may be detected to generate an error signal proportional to the phase difference. The error signal is converted into appropriate feedback signals to phase lock the divided beatnote to the reference signal. The slave laser frequency target may be rapidly changed based on a combination of a dynamically changing frequency of the reference signal, the frequency dividing factor, and an effective polarity of the error signal. Feed-forward signals may be generated to accelerate the slave laser frequency switching through laser tuning ports.Type: ApplicationFiled: May 17, 2012Publication date: November 21, 2013Inventors: JEFFREY R. CHEN, Kenji Numata, Stewart T. Wu, Guangning Yang
-
Publication number: 20100080553Abstract: A communication system may include a first control circuit to detect a break on a first optical link; a first optical source to supply a first optical signal on a second optical link in response to detecting the break on the first optical link, the first optical signal propagating in a first direction on the second optical link; a second control circuit to detect a presence of the first optical signal on the second optical link, and output a control signal in response to detecting the presence of the first optical signal; and a second optical source to supply a second optical signal on the second optical link, the second optical signal propagating in a second direction opposite the first direction, where the Raman pump is disabled in response to the control signal.Type: ApplicationFiled: September 29, 2008Publication date: April 1, 2010Inventors: David Kerr, Mark Laliberte, Avery Van Gieson, John Lai, Kim Jepsen, Wei Lu, Yan Han, Marc Placidet, Ulrik Gliese, David Copeland, Guangning Yang
-
Patent number: 7062169Abstract: A system compensates for the presence of power transients. The system receives a data signal and detects the occurrence of a power transient. The system generates a threshold signal based on the detected power transient and determines a value of the data signal based on the threshold signal.Type: GrantFiled: April 18, 2002Date of Patent: June 13, 2006Assignee: Dorsal Networks, Inc.Inventors: Greg Mooney, Guangning Yang
-
Patent number: 6714695Abstract: A method of modulating an optical signal is provided comprising the steps of providing a first electric field in a first optical signal path, providing a second electric field in a second optical signal path, transmitting an optical signal along the first optical signal path and the second optical signal path, amplitude modulating the optical signal via the first electric field and the second electric field, and phase modulating the optical signal via the first electric field and the second electric field. A clock source and a data source are ANDed to provide a data modulated RF signal on an offset waveguide electrode for generating the first and second electric fields. The magnitude of the electric field of the first electric field in the first optical signal path is greater than the magnitude of the electric field of the second electric field in the second optical signal path.Type: GrantFiled: September 17, 2001Date of Patent: March 30, 2004Assignee: Dorsal Networks, Inc.Inventor: Guangning Yang
-
Publication number: 20030198474Abstract: A system compensates for the presence of power transients. The system receives a data signal and detects the occurrence of a power transient. The system generates a threshold signal based on the detected power transient and determines a value of the data signal based on the threshold signal.Type: ApplicationFiled: April 18, 2002Publication date: October 23, 2003Inventors: Greg Mooney, Guangning Yang
-
Publication number: 20030067655Abstract: An IP router is integrated with an LRTR. A forward error correction (FEC) unit associated with the LRTR provides a frame structure, error detection and other functionality previously performed by SDH or SONET protocol devices. The FEC unit is clocked independently of the routing functionality and a processor coordinates the flow of IP data packets between the routing functionality and the LRTR functionality, e.g., by controlling buffer underflow and overflow conditions.Type: ApplicationFiled: October 5, 2001Publication date: April 10, 2003Inventors: Bo Pedersen, Lee Daniel Feinberg, Guangning Yang, Brent Ashley Miller, William C. Phillips
-
Publication number: 20030053728Abstract: A method of modulating an optical signal is provided comprising the steps of providing a first electric field in a first optical signal path, providing a second electric field in a second optical signal path, transmitting an optical signal along the first optical signal path and the second optical signal path, amplitude modulating the optical signal via the first electric field and the second electric field, and phase modulating the optical signal via the first electric field and the second electric field. A clock source and a data source are ANDed to provide a data modulated RF signal on an offset waveguide electrode for generating the first and second electric fields. The magnitude of the electric field of the first electric field in the first optical signal path is greater than the magnitude of the electric field of the second electric field in the second optical signal path.Type: ApplicationFiled: September 17, 2001Publication date: March 20, 2003Applicant: Dorsal Networks, Inc.Inventor: Guangning Yang
-
Publication number: 20020057858Abstract: A method and apparatus is provided for generating optical pulses with an electro-optic amplitude modulator. The modulator includes first and second waveguides that form an optical interferometer. At least the first waveguide includes an electro-optic material such as lithium niobate and an electrode extending along a portion thereof. Input and output optical waveguides are respectively coupled to input and output junctions of the interferometer. A voltage source biases the electrode such that a modulation switching curve arises that generates two optical pulses over a complete voltage cycle.Type: ApplicationFiled: January 10, 2002Publication date: May 16, 2002Inventor: Guangning Yang
-
Patent number: 6370283Abstract: A method and apparatus is provided for generating optical pulses with an electro-optic amplitude modulator. The modulator includes first and second waveguides that form an optical interferometer. At least the first waveguide includes an electro-optic material such as lithium niobate and an electrode extending along a portion thereof. Input and output optical waveguides are respectively coupled to input and output junctions of the interferometer. A voltage source biases the electrode such that a modulation switching curve arises that generates two optical pulses over a complete voltage cycle.Type: GrantFiled: October 29, 1998Date of Patent: April 9, 2002Assignee: TyCom (U.S.) Inc.Inventor: Guangning Yang