Patents by Inventor Gee-Kung Chang
Gee-Kung Chang 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: 10516434Abstract: A communication circuit in a wireless communications system (WCS) is provided. The WCS employs self-interference cancellation (SIC) circuitry to suppress an interference signal(s) associated with an uplink communications signal(s) in a target uplink band(s). A communication circuit is employed to provide more accurate temporal and phase estimates about interference signal(s) in the target uplink band(s). The communication circuit utilizes an anchor downlink signal, which can be any of the downlink communications signals communicated in the WCS, to help determine an optimal phase shift for uplink communications signal(s) in the target uplink band(s). Accordingly, the SIC circuitry can suppress the interference signal(s) in the target uplink band(s) based on the optimal phase shift.Type: GrantFiled: March 15, 2018Date of Patent: December 24, 2019Assignee: Corning IncorporatedInventors: Gee-Kung Chang, Lin Cheng, Anthony Ng'Oma, Po-Tsung Shih
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Publication number: 20180269923Abstract: A communication circuit in a wireless communications system (WCS) is provided. The WCS employs self-interference cancellation (SIC) circuitry to suppress an interference signal(s) associated with an uplink communications signal(s) in a target uplink band(s). A communication circuit is employed to provide more accurate temporal and phase estimates about interference signal(s) in the target uplink band(s). The communication circuit utilizes an anchor downlink signal, which can be any of the downlink communications signals communicated in the WCS, to help determine an optimal phase shift for uplink communications signal(s) in the target uplink band(s). Accordingly, the SIC circuitry can suppress the interference signal(s) in the target uplink band(s) based on the optimal phase shift.Type: ApplicationFiled: March 15, 2018Publication date: September 20, 2018Inventors: Gee-Kung Chang, Lin Cheng, Anthony Ng'Oma, Po-Tsung Shih
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Patent number: 9634786Abstract: In one aspect, the present disclosure relates to a communications system which, in one embodiment, includes a phase-correlated, orthogonally-polarized, light-stream generator (POLG) for preparing light into phase coherent light streams having defined states of polarization and spectral composition. In one embodiment, the POLG includes a light source configured to emit light having a predetermined wavelength and a polarization apparatus configured to prepare light from the light source into particular states of polarization. The POLG also includes a phase modulator configured to produce light having a plurality of wavelengths and configured to retard the phase of propagation of light with a first state of linear polarization while not retarding the phase of light with a state of linear polarization orthogonal to the first state of linear polarization when an external electric field is applied.Type: GrantFiled: February 13, 2016Date of Patent: April 25, 2017Assignee: Georgia Tech Research CorporationInventors: Jian Yu Zheng, Gee-Kung Chang, Daniel Guidotti, Mu Xu
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Publication number: 20160248515Abstract: In one aspect, the present disclosure relates to a communications system which, in one embodiment, includes a phase-correlated, orthogonally-polarized, light-stream generator (POLG) for preparing light into phase coherent light streams having defined states of polarization and spectral composition. In one embodiment, the POLG includes a light source configured to emit light having a predetermined wavelength and a polarization apparatus configured to prepare light from the light source into particular states of polarization. The POLG also includes a phase modulator configured to produce light having a plurality of wavelengths and configured to retard the phase of propagation of light with a first state of linear polarization while not retarding the phase of light with a state of linear polarization orthogonal to the first state of linear polarization when an external electric field is applied.Type: ApplicationFiled: February 13, 2016Publication date: August 25, 2016Inventors: Jian Yu Zheng, Gee-Kung Chang, Daniel Guidotti, Mu Xu
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Patent number: 8971712Abstract: Certain implementations of the disclosed technology may include systems, methods, and apparatus for carrier-embedded optical radio-over-fiber (RoF) communications. Example embodiments of the method may include modulating a baseband signal with and an intermediate frequency (IF) and a radio frequency (RF) carrier signal to produce a RF modulated optical signal, transmitting the RF modulated optical signal to a remote access point with an optical fiber, and detecting the transmitted RF modulated optical signal. The method may also include receiving a RF uplink signal and mixing a harmonic of the RF carrier signal with the received RF uplink signal to down-convert the received RF uplink signal to an IF uplink signal. The method may include modulating a second optical source with the IF uplink signal to produce an IF uplink optical signal, transmitting the IF uplink optical signal via an optical fiber, and detecting the IF uplink optical signal.Type: GrantFiled: March 4, 2013Date of Patent: March 3, 2015Assignee: Georgia Tech Research CorporationInventors: Shu Hao Fan, Gee-Kung Chang, Cheng Liu
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Publication number: 20130230328Abstract: Certain implementations of the disclosed technology may include systems, methods, and apparatus for carrier-embedded optical radio-over-fiber (RoF) communications. Example embodiments of the method may include modulating a baseband signal with and an intermediate frequency (IF) and a radio frequency (RF) carrier signal to produce a RF modulated optical signal, transmitting the RF modulated optical signal to a remote access point with an optical fiber, and detecting the transmitted RF modulated optical signal. The method may also include receiving a RF uplink signal and mixing a harmonic of the RF carrier signal with the received RF uplink signal to down-convert the received RF uplink signal to an IF uplink signal. The method may include modulating a second optical source with the IF uplink signal to produce an IF uplink optical signal, transmitting the IF uplink optical signal via an optical fiber, and detecting the IF uplink optical signal.Type: ApplicationFiled: March 4, 2013Publication date: September 5, 2013Applicant: Georgia Tech Research CorporationInventors: Shu Hao Fan, Gee-Kung Chang, Cheng Liu
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Publication number: 20110206383Abstract: The present invention describes systems and methods of providing optical information transmission systems. An exemplary embodiment of the present invention includes a precoder configured to differentially encode a binary data signal, a duobinary encoder configured to encode the differentially encoded binary data signal as a three-level duobinary signal, an electrical-to-optical conversion unit configured to convert the three-level duobinary signal into a two-level optical signal, and an optical upconversion unit configured to modulate the two-level optical signal onto a higher frequency optical carrier signal and transmit the modulated higher frequency optical carrier signal onto an optical transmission medium.Type: ApplicationFiled: February 25, 2011Publication date: August 25, 2011Applicant: GEORGIA TECH RESEARCH CORPORATIONInventors: Hung-Chang CHIEN, Arshad Chowdhury, Gee-Kung Chang
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Publication number: 20100278538Abstract: A wireless communication system adapted to transmit data between two locations, for example between a plurality of processors and memory. Digitally coded millimeter waves can be used to transfer data between antenna arrays. A global optical clock can provide network coherence, frequency self-tracking, and a local oscillator signal for data digital symbol coding/decoding and symbol up-down conversion to/from the millimeter wavelength carrier.Type: ApplicationFiled: April 28, 2010Publication date: November 4, 2010Applicant: Georgia Tech Research CorporationInventors: Daniel Guidotti, Gee-Kung Chang, Shu-Hao Fan, Arshad Chowdhury, Hung-Chang Chien
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Publication number: 20100158512Abstract: A centrally-managed, colorless, bi-directional wavelength division multiplexed passive optical network (WDM-PON) architecture. The WDM-PON architecture is self-survivable, and can protect network failures in, for example, distribution/feeder fiber, remote node and laser failure. The WDM-PON architecture requires only N-wavelength channels for N optical network units.Type: ApplicationFiled: October 20, 2009Publication date: June 24, 2010Applicant: Georgia Tech Research CorporationInventors: Gee-Kung Chang, Arshad Chowdhury, Hung-Chang Chien
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Patent number: 7482667Abstract: An edge viewing semiconductor photodetector may be provided. Light may be transmitted through an optical fiber conduit comprising a core region surrounded by a cladding region. The light may be received at the edge viewing semiconductor photodetector having an active area. The active area may be substantially contained within a first plane. The edge viewing semiconductor photodetector may further have conducting contact pads connected to the active area. The contact pads may be substantially contained within plural planes. The first plane may have its normal direction substantially inclined with respect to a normal direction of the plural planes. The first plane may further have its normal direction substantially inclined with respect to a direction of the received light incident to the active area. Next, a signal may be received from the pads. The signal may correspond to the transmitted light.Type: GrantFiled: February 22, 2006Date of Patent: January 27, 2009Assignee: Georgia Tech Research CorporationInventors: Daniel Guidotti, Gee-Kung Chang, Jae-Hyun Ryou, Russell Dean Dupuis
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Publication number: 20060269288Abstract: A flexible optical harness containing lasers and photodetectors that are pre-aligned to light conduits may be provided. Light may be transmitted through an optical conduit comprising a core region surrounded by a cladding region. The coupling between optical conduits and emitting laser and receiving photodetector occurs via an interface between each designated optical conduit and between each photodetector and each designated optical conduit. A detector's active area forms an interface with the designated light conduit's core. The laser's emission area forms an interface with the designated light conduit's core. The said optical harness may, in addition, be combined with a flexible conducting harness between common blocks.Type: ApplicationFiled: May 23, 2006Publication date: November 30, 2006Applicant: Georgia Tech Research CorporationInventors: Daniel Guidotti, Gee-Kung Chang
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Publication number: 20060186503Abstract: An edge viewing semiconductor photodetector may be provided. Light may be transmitted through an optical fiber conduit comprising a core region surrounded by a cladding region. The light may be received at the edge viewing semiconductor photodetector having an active area. The active area may be substantially contained within a first plane. The edge viewing semiconductor photodetector may further have conducting contact pads connected to the active area. The contact pads may be substantially contained within plural planes. The first plane may have its normal direction substantially inclined with respect to a normal direction of the plural planes. The first plane may further have its normal direction substantially inclined with respect to a direction of the received light incident to the active area. Next, a signal may be received from the pads. The signal may correspond to the transmitted light.Type: ApplicationFiled: February 22, 2006Publication date: August 24, 2006Inventors: Daniel Guidotti, Gee-Kung Chang, Jae-Hyun Ryou, Russell Dupuis
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Patent number: 7039316Abstract: An optical signaling header technique applicable to optical networks wherein packet routing information is embedded in the same channel or wavelength as the data payload so that both the header and data payload propagate through network elements with the same path and the associated delays. The technique effects survivability and security of the optical networks by encompassing conventional electronic security with an optical security layer by generating replicated versions of the input data payload at the input node, and the transmission of each of the replicated versions over a corresponding one of the plurality of links. Moreover, each of the links is composed of multiple wavelengths to propagate optical signals or optical packets, and each of the replicated versions of the data payload may be propagated over a selected one of the wavelengths in each corresponding one of the plurality of links.Type: GrantFiled: January 30, 2001Date of Patent: May 2, 2006Assignee: The Regents of the University of CaliforniaInventors: Gee-Kung Chang, Arshad M. Chowdhury, Georgios Ellinas
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Patent number: 6934472Abstract: An optical signaling header technique applicable to optical networks wherein packet routing information is embedded in the same channel or wavelength as the data payload so that both the header and data payload propagate through network elements with the same path and the associated delays. The technique effects survivability and security of the optical networks by encompassing conventional electronic security with an optical security layer by generating replicated versions of the input data payload at the input node, and the transmission of each of the replicated versions over a corresponding one of the plurality of links. Moreover, each of the links is composed of multiple wavelengths to propagate optical signals or optical packets, and each of the replicated versions of the data payload may be propagated over a selected one of the wavelengths in each corresponding one of the plurality of links.Type: GrantFiled: January 30, 2001Date of Patent: August 23, 2005Assignee: The Regents of the University of CaliforniaInventors: Gee-Kung Chang, Arshad M. Chowdhury, Georgios Ellinas
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Patent number: 6873797Abstract: An optical signaling header technique applicable to optical networks wherein packet routing information is embedded in the same channel or wavelength as the data payload so that both the header and data payload propagate through network elements with the same path and the associated delays. The technique effects survivability and security of the optical networks by encompassing conventional electronic security with an optical security layer by generating replicated versions of the input data payload at the input node, and the transmission of each of the replicated versions over a corresponding one of the plurality of links. Moreover, each of the links is composed of multiple wavelengths to propagate optical signals or optical packets, and each of the replicated versions of the data payload may be propagated over a selected one of the wavelengths in each corresponding one of the plurality of links.Type: GrantFiled: January 30, 2001Date of Patent: March 29, 2005Assignee: The Regents of the University of CaliforniaInventors: Gee-Kung Chang, Arshad M. Chowdhury, Georgios Ellinas
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Patent number: 6850707Abstract: An optical signaling header technique applicable to optical networks wherein packet routing information is embedded in the same channel or wavelength as the data payload so that both the header and data payload propagate through network elements with the same path and the associated delays. The technique effects survivability and security of the optical networks by encompassing conventional electronic security with an optical security layer by generating replicated versions of the input data payload at the input node, and the transmission of each of the replicated versions over a corresponding one of the plurality of links. Moreover, each of the links is composed of multiple wavelengths to propagate optical signals or optical packets, and each of the replicated versions of the data payload may be propagated over a selected one of the wavelengths in each corresponding one of the plurality of links.Type: GrantFiled: January 30, 2001Date of Patent: February 1, 2005Assignee: The Regents of the University of CaliforniaInventors: Gee-Kung Chang, Arshad M. Chowdhury, Georgios Ellinas
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Patent number: 6850515Abstract: An optical signaling header technique applicable to optical networks wherein packet routing information is embedded in the same channel or wavelength as the data payload so that both the header and data payload propagate through network elements with the same path and the associated delays. The technique effects survivability and security of the optical networks by encompassing conventional electronic security with an optical security layer by generating replicated versions of the input data payload at the input node, and the transmission of each of the replicated versions over a corresponding one of the plurality of links. Moreover, each of the links is composed of multiple wavelengths to propagate optical signals or optical packets, and each of the replicated versions of the data payload may be propagated over a selected one of the wavelengths in each corresponding one of the plurality of links.Type: GrantFiled: January 30, 2001Date of Patent: February 1, 2005Assignee: The Regents of the University of CaliforniaInventors: Gee-Kung Chang, Arshad M. Chowdhury, Georgios Ellinas
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Patent number: 6819666Abstract: An optical signaling header technique applicable to optical networks wherein packet routing information is embedded in the same channel or wavelength as the data payload so that both the header and data payload propagate through network elements with the same path and the associated delays. The technique effects survivability and security of the optical networks by encompassing conventional electronic security with an optical security layer by generating replicated versions of the input data payload at the input node, and the transmission of each of the replicated versions over a corresponding one of the plurality of links. Moreover, each of the links is composed of multiple wavelengths to propagate optical signals or optical packets, and each of the replicated versions of the data payload may be propagated over a selected one of the wavelengths in each corresponding one of the plurality of links.Type: GrantFiled: January 30, 2001Date of Patent: November 16, 2004Assignee: The Regents of the University of CaliforniaInventors: Gee-Kung Chang, Arshad M. Chowdhury, Georgios Ellinas
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Patent number: 6813276Abstract: An optical signaling header technique applicable to optical networks wherein packet routing information is embedded in the same channel or wavelength as the data payload so that both the header and data payload propagate through network elements with the same path and the associated delays. The technique effects survivability and security of the optical networks by encompassing conventional electronic security with an optical security layer by generating replicated versions of the input data payload at the input node, and the transmission of each of the replicated versions over a corresponding one of the plurality of links. Moreover, each of the links is composed of multiple wavelengths to propagate optical signals or optical packets, and each of the replicated versions of the data payload may be propagated over a selected one of the wavelengths in each corresponding one of the plurality of links.Type: GrantFiled: January 30, 2001Date of Patent: November 2, 2004Assignee: The Regents of the University of CaliforniaInventors: Gee-Kung Chang, Arshad M. Chowdhury, Georgios Ellinas
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Patent number: RE41063Abstract: An optical signaling header technique applicable to optical networks wherein packet routing information is embedded in the same channel or wavelength as the data payload so that both the header and data payload propagate through network elements with the same path and the associated delays. The technique effects survivability and security of the optical networks by encompassing conventional electronic security with an optical security layer by generating replicated versions of the input data payload at the input node, and the transmission of each of the replicated versions over a corresponding one of the plurality of links. Moreover, each of the links is composed of multiple wavelengths to propagate optical signals or optical packets, and each of the replicated versions of the data payload may be propagated over a selected one of the wavelengths in each corresponding one of the plurality of links.Type: GrantFiled: May 2, 2008Date of Patent: December 29, 2009Assignee: The Regents of the University of CaliforniaInventors: Gee-Kung Chang, Arshad Chowdhury, Georgios Ellinas