Patents by Inventor Kun-Yii Tu
Kun-Yii Tu 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: 9164239Abstract: There is provided a method and apparatus for optically filtering a communication signal. More specifically, in one embodiment, there is provided an apparatus comprising an optical filter having first and second input ports and first and second output ports, the optical filter being configured to transmit light in a target frequency range to the first output port in response to receiving light at the first input port and being configured to transmit light in the target frequency range to the second input port in response to receiving light at the second output port, and first and second photodiodes, the first diode being located to be illuminated by light from the first output port and the second photodiode being located to be illuminated by light from the second input port.Type: GrantFiled: March 15, 2006Date of Patent: October 20, 2015Assignee: Alcatel LucentInventors: Douglas M. Gill, Mahmoud Rasras, Kun-Yii Tu
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Patent number: 8238017Abstract: An optical path is configured to propagate an input optical signal. A plurality of electrodes are configured to produce a plurality of discrete phase shifts on the optical signal. An output optical signal is phase-shifted with respect to the input optical signal by a sum of the plurality of discrete phase shifts.Type: GrantFiled: December 18, 2009Date of Patent: August 7, 2012Assignee: Alcatel LucentInventors: Kun-Yii Tu, Ting-Chen Hu, Young-Kai Chen
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Publication number: 20120121268Abstract: A radiofrequency (rf) signal-processing device offers the possibility of high bandwidth operation. The disclosed device applies principles of microwave photonics and Linear Amplification based on Nonlinear Components (LINC). For some applications, the device may be embodied in an rf amplifier or rf transmitter. In an embodiment, an optical phase modulator is configured to receive an optical carrier signal as input, and further configured so that, when driven by an rf modulation signal, it will produce a complementary pair of optical signals as output. Each of a pair of detectors is configured to convert a respective one of the complementary optical signals to an rf signal. An rf combiner is configured to add the converted radiofrequency signals from the detectors to form an output signal.Type: ApplicationFiled: January 19, 2012Publication date: May 17, 2012Inventors: Young-Kai Chen, Kun-Yii Tu, Michael George Zierdt
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Patent number: 8164819Abstract: In a radio frequency (RF)-photonic arbitrary waveform generator (AWG), an optical carrier signal is phase-modulated using an arbitrary waveform optical phase generator (AWPOG), which may include, e.g., sequential optical phase modulators. The phase-modulated optical signal is combined with a version of the optical carrier signal to yield an optical waveform, whose amplitude varies with a phase shift introduced by the AWPOG to the optical carrier signal. By manipulating electrical inputs to the AWPOG which control the phase shift, the optical waveform can be arbitrary shaped. The optical waveform may then be converted to an electrical waveform having a radio frequency.Type: GrantFiled: May 10, 2010Date of Patent: April 24, 2012Assignee: Alcatel LucentInventors: Kun-Yii Tu, Ting-Chen Hu, Young-Kai Chen
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Patent number: 8055141Abstract: An apparatus and method for reducing electrical signal intermodulation by processing a balanced electrical signal in the optical domain in a manner adapted to reduce noise and second order intermodulation, and converting the processed optical signal back to an electrical domain signal with either a single or balanced (differential) outputs.Type: GrantFiled: December 17, 2007Date of Patent: November 8, 2011Assignee: Alcatel LucentInventors: Young-Kai Chen, Andreas Bertold Leven, Mahmoud Rasras, Kun-Yii Tu
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Patent number: 8032023Abstract: Programmable wavelength line switches and routers based on a complementary wavelength switch (CWS) building block are described for switching optical signals of different wavelengths between signal lines, with each carrying multiple wavelengths. The CWS building block is based on a complementary bandpass filter structure. The reconfigurable wavelength routers described allow any of a plurality of wavelengths on any line to be switched to any output line by programming the filters accordingly. The various implementations described are useful for wavelength division multiplexing (WDM), dense WDM, and ultra dense WDM optical communications systems, as well as for on-chip interconnects and optical signal processing.Type: GrantFiled: November 7, 2008Date of Patent: October 4, 2011Assignee: Alcatel LucentInventors: Mahmoud Rasras, Kun-Yii Tu
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Patent number: 8014676Abstract: According to one embodiment, a microwave photonic band-stop (MPBS) filter uses an electrical input signal to drive an optical Mach-Zehnder modulator. A modulated optical carrier produced by the modulator is applied to an optical filter having at least two tunable spectral attenuation bands that are located substantially symmetrically on either side of the carrier frequency. The resulting filtered optical signal is applied to an optical-to-electrical (O/E) converter to produce an electrical output signal.Type: GrantFiled: February 22, 2008Date of Patent: September 6, 2011Assignee: Alcatel LucentInventors: Young-Kai Chen, Sanjay Patel, Mahmoud Rasras, Kun-Yii Tu
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Publication number: 20110149369Abstract: An optical path is configured to propagate an input optical signal. A plurality of electrodes are configured to produce a plurality of discrete phase shifts on the optical signal. An output optical signal is phase-shifted with respect to the input optical signal by a sum of the plurality of discrete phase shifts.Type: ApplicationFiled: December 18, 2009Publication date: June 23, 2011Applicant: Alcatel-Lucent USA, IncorporatedInventors: Kun-Yii Tu, Ting-Chen Hu, Y. K. Chen
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Publication number: 20110149370Abstract: In a radio frequency (RF)-photonic arbitrary waveform generator (AWG), an optical carrier signal is phase-modulated using an arbitrary waveform optical phase generator (AWPOG), which may include, e.g., sequential optical phase modulators. The phase-modulated optical signal is combined with a version of the optical carrier signal to yield an optical waveform, whose amplitude varies with a phase shift introduced by the AWPOG to the optical carrier signal. By manipulating electrical inputs to the AWPOG which control the phase shift, the optical waveform can be arbitrary shaped. The optical waveform may then be converted to an electrical waveform having a radio frequency.Type: ApplicationFiled: May 10, 2010Publication date: June 23, 2011Applicant: Alcatel-Lucent USA Inc.Inventors: Kun-Yii Tu, Ting-Chen Hu, Young-Kai Chen
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Publication number: 20100247103Abstract: A radiofrequency (rf) signal-processing device offers the possibility of high bandwidth operation. The disclosed device applies principles of microwave photonics and Linear Amplification based on Nonlinear Components (LINC). For some applications, the device may be embodied in an rf amplifier or rf transmitter. In an embodiment, an optical phase modulator is configured to receive an optical carrier signal as input, and further configured so that, when driven by an rf modulation signal, it will produce a complementary pair of optical signals as output. Each of a pair of detectors is configured to convert a respective one of the complementary optical signals to an rf signal. An rf combiner is configured to add the converted radiofrequency signals from the detectors to form an output signal.Type: ApplicationFiled: March 31, 2009Publication date: September 30, 2010Inventors: Young-Kai Chen, Kun-Yii Tu, Michael George Zierdt
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Publication number: 20100119226Abstract: Programmable wavelength line switches and routers based on a complementary wavelength switch (CWS) building block are described for switching optical signals of different wavelengths between signal lines, with each carrying multiple wavelengths. The CWS building block is based on a complementary bandpass filter structure. The reconfigurable wavelength routers described allow any of a plurality of wavelengths on any line to be switched to any output line by programming the filters accordingly. The various implementations described are useful for wavelength division multiplexing (WDM), dense WDM, and ultra dense WDM optical communications systems, as well as for on-chip interconnects and optical signal processing.Type: ApplicationFiled: November 7, 2008Publication date: May 13, 2010Inventors: Mahmoud Rasras, Kun-Yii Tu
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Patent number: 7688872Abstract: A self-calibrating integrated photonic circuit and a method of controlling the same. In one embodiment, the circuit includes: (1) a substrate, (2) a laser located on the substrate and configured to produce source light at an output frequency, (3) a laser alignment sensor located on the substrate and including: (3a) a reference optical resonator configured to receive the source light, have a null proximate a predetermined center frequency and provide output light as a function of a relationship between the output frequency and the center frequency and (3b) a photodetector configured to provide an electrical signal of a magnitude that is based on the output light and (4) a calibration controller located on the substrate, coupled to the photodetector and configured to adjust the output frequency based on the magnitude.Type: GrantFiled: March 18, 2008Date of Patent: March 30, 2010Assignee: Alcatel-Lucent USA Inc.Inventors: Young-Kai Chen, Mahmoud Rasras, Kun-Yii Tu
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Publication number: 20090238557Abstract: A self-calibrating integrated photonic circuit and a method of controlling the same. In one embodiment, the circuit includes: (1) a substrate, (2) a laser located on the substrate and configured to produce source light at an output frequency, (3) a laser alignment sensor located on the substrate and including: (3a) a reference optical resonator configured to receive the source light, have a null proximate a predetermined center frequency and provide output light as a function of a relationship between the output frequency and the center frequency and (3b) a photodetector configured to provide an electrical signal of a magnitude that is based on the output light and (4) a calibration controller located on the substrate, coupled to the photodetector and configured to adjust the output frequency based on the magnitude.Type: ApplicationFiled: March 18, 2008Publication date: September 24, 2009Applicant: Lucent Technologies Inc.Inventors: Young-Kai Chen, Mahmoud Rasras, Kun-Yii Tu
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Publication number: 20090214223Abstract: According to one embodiment, a microwave photonic band-stop (MPBS) filter uses an electrical input signal to drive an optical Mach-Zehnder modulator. A modulated optical carrier produced by the modulator is applied to an optical filter having at least two tunable spectral attenuation bands that are located substantially symmetrically on either side of the carrier frequency. The resulting filtered optical signal is applied to an optical-to-electrical (O/E) converter to produce an electrical output signal.Type: ApplicationFiled: February 22, 2008Publication date: August 27, 2009Applicant: LUCENT TECHNOLOGIES INC.Inventors: Young-Kai Chen, Sanjay Patel, Mahmoud Rasras, Kun-Yii Tu
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Publication number: 20090161113Abstract: An apparatus and method for automated calibration of an optical device are disclosed. The apparatus is an integrated optoelectronic system that includes input and output optical waveguides, a tunable optical device, an optical source, an optical detector, and an electronic controller formed on a single substrate. The tunable optical device has one or more tuning elements for varying one or more characteristics of the device. The optical source is coupled to the input waveguide for providing a calibration signal to the device. The optical detector is coupled to the output optical waveguide for measuring an intensity of the optical signal output by the device in response to receiving the calibration signal. The electronic controller is configured to perform a calibration of the device by varying a parameter of each tuning element and to receive intensity measurements of the optical signal output by the device as a function of the varied parameter.Type: ApplicationFiled: December 19, 2007Publication date: June 25, 2009Inventors: Young-Kai Chen, Sanjay Patel, Mahmoud Rasras, Kun-Yii Tu
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Publication number: 20090154940Abstract: An apparatus and method for reducing electrical signal intermodulation by processing a balanced electrical signal in the optical domain in a manner adapted to reduce noise and second order intermodulation, and converting the processed optical signal back to an electrical domain signal with either a single or balanced (differential) outputs.Type: ApplicationFiled: December 17, 2007Publication date: June 18, 2009Inventors: Young-Kai Chen, Andreas Bertold Leven, Mahmoud Rasras, Kun-Yii Tu
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Patent number: 7548668Abstract: An apparatus having a topology that allows building complicated optical programmable arrays useful for manipulating the phase and/or amplitude of an optical signal. Sophisticated filtering and other optical signal processing functionality can be programmed into the array after a chip containing the array has been fabricated. This programming capability is analogous to that of electronic field programmable gate arrays (FPGA's). Apparatus described herein will provide a powerful tool for processing optical signals or very broadband electrical signals.Type: GrantFiled: November 21, 2007Date of Patent: June 16, 2009Assignee: Alcatel-Lucent USA Inc.Inventors: Young-Kai Chen, Andreas Leven, Mahmoud Rasras, Kun-Yii Tu
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Publication number: 20090129723Abstract: An apparatus having a topology that allows building complicated optical programmable arrays useful for manipulating the phase and/or amplitude of an optical signal. Sophisticated filtering and other optical signal processing functionality can be programmed into the array after a chip containing the array has been fabricated. This programming capability is analogous to that of electronic field programmable gate arrays (FPGA's). Apparatus described herein will provide a powerful tool for processing optical signals or very broadband electrical signals.Type: ApplicationFiled: November 21, 2007Publication date: May 21, 2009Applicant: LUCENT TECHNOLOGIES INC.Inventors: Young-Kai CHEN, Andreas LEVEN, Mahmoud RASRAS, Kun-Yii TU
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Patent number: 7471904Abstract: A method and apparatus are provided for performing electronic equalization in optical communication systems. Coefficient values in equalizers, such as feed forward equalizers or decision feedback equalizers, are updated using higher-order algorithms in the Least-Mean-2Nth-Order family. An optical receiver includes a photo-detector for converting a received optical signal to an electrical signal; and an equalizer for removing intersymbol interference from the electrical signal, wherein coefficients of the equalizer are updated based upon a least-mean 2Nth-order (LMN) algorithm (N is greater than one). Feed forward equalizer and decision feedback equalizer implementations are disclosed. The non-symmetric nature of optical noise is addressed by varying A slicer threshold based on an incoming signal distribution to reduce bit errors.Type: GrantFiled: July 25, 2003Date of Patent: December 30, 2008Assignee: Alcatel-Lucent USA Inc.Inventors: Noriaki Kaneda, Ut-Va Koc, Kun-Yii Tu
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Publication number: 20070217737Abstract: There is provided a method and apparatus for optically filtering a communication signal. More specifically, in one embodiment, there is provided an apparatus comprising an optical filter having first and second input ports and first and second output ports, the optical filter being configured to transmit light in a target frequency range to the first output port in response to receiving light at the first input port and being configured to transmit light in the target frequency range to the second input port in response to receiving light at the second output port, and first and second photodiodes, the first diode being located to be illuminated by light from the first output port and the second photodiode being located to be illuminated by light from the second input port.Type: ApplicationFiled: March 15, 2006Publication date: September 20, 2007Inventors: Douglas Gill, Mahmoud Rasras, Kun-Yii Tu