Patents by Inventor Dae-Su Yee
Dae-Su Yee 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: 10222204Abstract: Provided is a high-speed 3D imaging system using continuous-wave THz beam scan, and more particularly, a high-speed 3D imaging system using continuous-wave THz beam scan capable of acquiring a 3D image for a sample at a high speed and high precision by measuring a signal reflected from a sample using the continuous-wave THz beam generated from a wavelength-fixed laser and a wavelength-swept laser and having a frequency varying at a high speed to obtain depth direction information on a sample and performing a 2D scan on the sample using a THz beam scanner.Type: GrantFiled: October 12, 2016Date of Patent: March 5, 2019Assignee: KOREA RESEARCH INSTITUTE OF STANDARDS AND SCIENCEInventors: Ji Sang Yahng, Dae-Su Yee
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Publication number: 20170102231Abstract: Provided is a high-speed 3D imaging system using continuous-wave THz beam scan, and more particularly, a high-speed 3D imaging system using continuous-wave THz beam scan capable of acquiring a 3D image for a sample at a high speed and high precision by measuring a signal reflected from a sample using the continuous-wave THz beam generated from a wavelength-fixed laser and a wavelength-swept laser and having a frequency varying at a high speed to obtain depth direction information on a sample and performing a 2D scan on the sample using a THz beam scanner.Type: ApplicationFiled: October 12, 2016Publication date: April 13, 2017Inventors: Ji Sang YAHNG, Dae-Su YEE
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Patent number: 9541377Abstract: Provided is an apparatus for real-time non-contact non-destructive thickness measurement using a terahertz wave, and more particularly, an apparatus for real-time non-contact non-destructive thickness measurement using a terahertz wave, which is capable of measuring a thickness of a sample by irradiating a terahertz continuous wave, which is generated from a wavelength-fixed laser and a wavelength-swept laser and of which the frequency is changed at a high speed, to the sample and measuring the terahertz wave transmitting or reflected from the sample.Type: GrantFiled: November 9, 2015Date of Patent: January 10, 2017Assignee: Korea Research Institute of Standards and ScienceInventors: Dae-Su Yee, Ji Sang Yahng
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Publication number: 20170003116Abstract: Provided is an apparatus for real-time non-contact non-destructive thickness measurement using a terahertz wave, and more particularly, an apparatus for real-time non-contact non-destructive thickness measurement using a terahertz wave, which is capable of measuring a thickness of a sample by irradiating a terahertz continuous wave, which is generated from a wavelength-fixed laser and a wavelength-swept laser and of which the frequency is changed at a high speed, to the sample and measuring the terahertz wave transmitting or reflected from the sample.Type: ApplicationFiled: November 9, 2015Publication date: January 5, 2017Inventors: Dae-Su Yee, Ji Sang Yahng
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Patent number: 8476592Abstract: Provided is a terahertz wave apparatus. The terahertz wave apparatus includes: a wavelength-fixed laser emitting a first laser light having a fixed first wavelength; a wavelength-swept laser emitting a second laser light having a tunable second wavelength; a coupler coupling the first laser light with the second laser light; and a generator converting a mixed light emitted from the coupler into a terahertz wave, wherein a frequency of the terahertz wave is continuously tunable.Type: GrantFiled: October 20, 2010Date of Patent: July 2, 2013Assignees: Electronics and Telecommunications Research Institute, Korea Research Institute of Standards and ScienceInventors: Min Yong Jeon, Kyung Hyun Park, Dae-Su Yee
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Publication number: 20110192978Abstract: Provided is a terahertz wave apparatus. The terahertz wave apparatus includes: a wavelength-fixed laser emitting a first laser light having a fixed first wavelength; a wavelength-swept laser emitting a second laser light having a tunable second wavelength; a coupler coupling the first laser light with the second laser light; and a generator converting a mixed light emitted from the coupler into a terahertz wave, wherein a frequency of the terahertz wave is continuously tunable.Type: ApplicationFiled: October 20, 2010Publication date: August 11, 2011Applicants: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE, KOREA RESEARCH INSTITUTE OF STANDARD AND SCIENCEInventors: Min Yong JEON, Kyung Hyun PARK, Dae-Su YEE
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Patent number: 7680169Abstract: A multi-section semiconductor laser diode is disclosed. The laser diode includes a complex-coupled DFB laser section that includes a complex-coupled grating and an active structure for controlling the intensity of oscillating laser light, to oscillate laser light in a single mode, and an external cavity including a phase control section and an amplifier section, the phase control section having a passive waveguide that controls a phase variation of feedback laser light, the amplification section having an active structure that controls the strength of the feedback laser light. Currents are separately provided to the three sections to generate optical pulses with tuning range of tens of GHz. Applications include the clock recovery in the 3R regeneration of the optical communication.Type: GrantFiled: December 1, 2003Date of Patent: March 16, 2010Assignee: Electronics and Telecommunications Research InstituteInventors: Kyung-Hyun Park, Dae-Su Yee, Dong-Churl Kim, Young-Ahn Leem, Sung-Bock Kim
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Patent number: 7583868Abstract: A full 3R (re-timing, re-shaping, re-amplifying) recovery system is provided. In the full 3R recovery system, a self-pulsating laser diode (SP-LD) and an electroabsorption modulator (EAM) are integrated and disposed on a semiconductor substrate.Type: GrantFiled: December 6, 2005Date of Patent: September 1, 2009Assignee: Electronics and Telecommunications Research InstituteInventors: Dae Su Yee, Young Ahn Leem, Dong Churl Kim, Kyung Hyun Park, Sung Bock Kim
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Patent number: 7489873Abstract: The 3R regeneration system for a retiming, reshaping, and reamplifying an optical signal includes: first and second input ports in which a connected optical signal is input; an interferometer including first and second branches formed on a substrate, split at a common input node, combined at a common output node, semiconductor optical amplifiers in each of the first and second branches, the first branch being connected to the first input port, and the common input node being connected to the second input port; a self-pulsating laser diode monolithically integrated with the interferometer between one of the first input port and the first branch, and the second input port and the common input node on the substrate, receiving an optical signal, and outputting the optical signal regenerated by optical injection locking; and an output port connected to the common output node.Type: GrantFiled: November 22, 2005Date of Patent: February 10, 2009Assignee: Electronics and Telecommunications Research InstituteInventors: Young Ahn Leem, Dae Su Yee, Eun Deok Sim, Dong Churl Kim, Kyung Hyun Park
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Patent number: 7356263Abstract: Provided is a signal processor for converting a signal that converts a return to zero (RZ) signal into a non-return to zero (NRZ) signal, in which two 2R (re-amplifying, re-shaping) regenerators are connected in parallel between an input waveguide and an output waveguide with different lengths from each other. The 2R regenerator includes: two semiconductor optical amplifiers having different lengths from each other; and phase control means connected to a short semiconductor optical amplifier. The RZ signal input by a length difference of the waveguide is delayed by a time difference of a half of one bit so that the 2R regenerated NRZ signal can be obtained.Type: GrantFiled: July 27, 2005Date of Patent: April 8, 2008Assignee: Electronics and Telecommunications Research InstituteInventors: Dong Churl Kim, Dae Su Yee, Young Ahn Leem, Eun Deok Sim, Kyung Hyun Park
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Patent number: 7174070Abstract: A light source has a structure in which a 3-dB beam splitter is integrated with a Febry-Perot laser diode having a cleaved plane. A first waveguide grating and a first refractive index modifier changing a Bragg wavelength of the first waveguide grating are provided at one branch of the 3-dB beam splitter. A second waveguide grating and a second refractive index modifier changing a Bragg wavelength of the second waveguide grating are provided at another branch of the 3-dB beam splitter.Type: GrantFiled: July 1, 2004Date of Patent: February 6, 2007Assignee: Electronics and Telecommunications Research InstituteInventors: Dong Churl Kim, Dae Su Yee, Young Ahn Leem, Kyung Hyun Park
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Publication number: 20060092502Abstract: Provided is a signal regenerator for correcting distortion of an optical signal transmitted via an optical fiber in an optical communication system, which includes semiconductor optical amplifiers having different lengths from each other, an asymmetric Mach-Zehnder interferometer that performs 2R (re-amplifying, re-shaping) regeneration, and a delay interferometer with optical waveguides having different lengths from each other, whereby the fabrication is easy and a high-speed signal regeneration is enable.Type: ApplicationFiled: November 28, 2005Publication date: May 4, 2006Inventors: Dong Kim, Dae Su Yee, Young Ahn Leem, Eun Deok Sim, Kyung Hyun Park
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Publication number: 20060078253Abstract: The 3R regeneration system for a retiming, reshaping, and reamplifying an optical signal includes: first and second input ports in which a connected optical signal is input; an interferometer including first and second branches formed on a substrate, split at a common input node, combined at a common output node, semiconductor optical amplifiers in each of the first and second branches, the first branch being connected to the first input port, and the common input node being connected to the second input port; a self-pulsating laser diode monolithically integrated with the interferometer between one of the first input port and the first branch, and the second input port and the common input node on the substrate, receiving an optical signal, and outputting the optical signal regenerated by optical injection locking; and an output port connected to the common output node.Type: ApplicationFiled: November 22, 2005Publication date: April 13, 2006Inventors: Young Ahn Leem, Dae Su Yee, Eun Deok Sim, Dong Churl Kim, Kyung Hyun Park
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Patent number: 7012945Abstract: A multi DFB laser diode for generating spontaneous pulses comprises first and second DFB sections each of which has a substrate including a diffraction grating, an active layer formed on the substrate, a clad layer formed on the active layer and including a refraction varying layer, and an electrode formed on the active layer; and a phase tuning section including a substrate, an active layer formed on the substrate, a clad layer formed on the active layer, and an electrode isolated from the electrode of the first and second DFB sections. The refraction varying layer in the active layer of the first DFB section has a refractive index different from that of the refraction varying layer in the active layer of the second DFB section.Type: GrantFiled: December 1, 2003Date of Patent: March 14, 2006Assignee: Electronics and Telecommunications Research InstituteInventors: Kyung-Hyun Park, Young-Ahn Leem, Dong-Churl Kim, Dae-Su Yee, Sung-Bock Kim, Yong-Soon Baek
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Publication number: 20050276614Abstract: Provided is a signal processor for converting a signal that converts a return to zero (RZ) signal into a non-return to zero (NRZ) signal, in which two 2R (re-amplifying, re-shaping) regenerators are connected in parallel between an input waveguide and an output waveguide with different lengths from each other. The 2R regenerator includes: two semiconductor optical amplifiers having different lengths from each other; and phase control means connected to a short semiconductor optical amplifier. The RZ signal input by a length difference of the waveguide is delayed by a time difference of a half of one bit so that the 2R regenerated NRZ signal can be obtained.Type: ApplicationFiled: July 27, 2005Publication date: December 15, 2005Inventors: Dong Churl Kim, Dae Su Yee, Young Ahn Leem, Eun Deok Sim, Kyung Hyun Park
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Patent number: 6928098Abstract: Disclosed is a high frequency optical pulse source generating stable optical pulses over a wide current range in an optical transmission system to enhance stability and reliability, the high frequency optical pulse source implementing, in one chip, a multi-section distributed feedback (DFB) laser diode with a phase control section arranged between two DFB laser diodes. By controlling the current applied to the electrode of the phase control section while applying currents to the first and second DFB sections, the present invention causes self-mode locking between the compound-cavity modes having similar threshold currents, thereby generating stable tens GHz-level optical pulses. Hence, the present invention generates optical pulses uniformly over a wide current range, thereby enhancing the stability and reliability of the element.Type: GrantFiled: July 31, 2003Date of Patent: August 9, 2005Assignee: Electronics and Telecommunications Research InstituteInventors: Dong-Churl Kim, Young-Ahn Leem, Dae-Su Yee, Kyung-Hyun Pakr, Sung-Bock Kim, Yong-Soon Baek, Eun-Deok Sim
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Publication number: 20040125851Abstract: A multi-section semiconductor laser diode is disclosed. The laser diode includes a complex-coupled DFB laser section that includes a complex-coupled grating and an active structure for controlling the intensity of oscillating laser light, to oscillate laser light in a single mode, and an external cavity including a phase control section and an amplifier section, the phase control section having a passive waveguide that controls a phase variation of feedback laser light, the amplification section having an active structure that controls the strength of the feedback laser light. Currents are separately provided to the three sections to generate optical pulses with tuning range of tens of GHz. Applications include the clock recovery in the 3R regeneration of the optical communication.Type: ApplicationFiled: December 1, 2003Publication date: July 1, 2004Inventors: Kyung-Hyun Park, Dae-Su Yee, Dong-Churl Kim, Young-Ahn Leem, Sung-Bock Kim
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Publication number: 20040125845Abstract: A multi DFB laser diode for generating spontaneous pulses comprises first and second DFB sections each of which has a substrate including a diffraction grating, an active layer formed on the substrate, a clad layer formed on the active layer and including a refraction varying layer, and an electrode formed on the active layer; and a phase tuning section including a substrate, an active layer formed on the substrate, a clad layer formed on the active layer, and an electrode isolated from the electrode of the first and second DFB sections. The refraction varying layer in the active layer of the first DFB section has a refractive index different from that of the refraction varying layer in the active layer of the second DFB section.Type: ApplicationFiled: December 1, 2003Publication date: July 1, 2004Inventors: Kyung-Hyun Park, Young-Ahn Leem, Dong-Churl Kim, Dae-Su Yee, Sung-Bock Kim, Yong-Soon Baek
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Publication number: 20040114656Abstract: Disclosed is a high frequency optical pulse source generating stable optical pulses over a wide current range in an optical transmission system to enhance stability and reliability, the high frequency optical pulse source implementing, in one chip, a multi-section distributed feedback (DFB) laser diode with a phase control section arranged between two DFB laser diodes. By controlling the current applied to the electrode of the phase control section while applying currents to the first and second DFB sections, the present invention causes self-mode locking between the compound-cavity modes having similar threshold currents, thereby generating stable tens GHz-level optical pulses. Hence, the present invention generates optical pulses uniformly over a wide current range, thereby enhancing the stability and reliability of the element.Type: ApplicationFiled: July 31, 2003Publication date: June 17, 2004Inventors: Dong-Churl Kim, Young-Ahn Leem, Dae-Su Yee, Kyung-Hyun Park, Sung-Bock Kim, Yong-Soon Baek, Eun-Deok Sim