Patents by Inventor Jong Hoi Kim

Jong Hoi Kim 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).

  • Publication number: 20090154505
    Abstract: A wavelength tunable laser diode using a double coupled ring resonator is provided. A new double coupled ring resonator structure is formed by a connection of two ring resonators having different radii so that stable laser oscillation occurs only in a resonant wavelength at which the two ring resonators are simultaneously resonated, and the effective refractive index of the two ring resonators is properly controlled differently for tunable laser oscillation wavelengths. The reproducibility of the optical coupling characteristics of the passive waveguides and the ring resonator can be assured by multi-mode couplers. This results in improved manufacturing productivity of the wavelength tunable laser diode. It is possible to amplify and output an output light without having an effect on oscillation wavelength characteristic by means of an optical amplifier integrated in an output end.
    Type: Application
    Filed: July 29, 2008
    Publication date: June 18, 2009
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Kwang Ryong OH, Jong Hoi Kim, Dong Churl Kim, Oh Kee Kwon, Ki Soo Kim, Ki Hong Yoon
  • Publication number: 20090135857
    Abstract: Provided is a frequency-tunable terahertz light source device. The frequency-tunable terahertz light source device satisfies a Littrow diffraction condition at a wavelength and simultaneously satisfies a Littman-Metcalf diffraction condition at another wavelength using a double diffraction grating having two grating periods. Thus, oscillations simultaneously occur at the two different wavelengths, such that a terahertz wave can be stably generated by beating of the two oscillation wavelengths. In addition, the frequency-tunable terahertz light source device can readily change a frequency up to several terahertz and can be fabricated in a small size.
    Type: Application
    Filed: August 15, 2008
    Publication date: May 28, 2009
    Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Kwang Ryong OH, Jong Hoi KIM, Dong Churl KIM, Oh Kee KWON, Ki Soo KIM, Ki Hong YOON
  • Patent number: 7448758
    Abstract: An illumination unit includes first, second, third, and fourth light source units to emit first, second, third, and fourth light beams of different wavelength bands, and a hexahedral color synthesis prism to synthesize the first, second, third, and fourth light beams emitted from the first, second, third, and fourth light source units to propagate the first, second, third, and fourth light beams can propagate along the same path with respect to each other.
    Type: Grant
    Filed: September 26, 2005
    Date of Patent: November 11, 2008
    Assignee: Samsung Electronics Co., Ltd
    Inventors: Jong-hoi Kim, Young-chol Lee, Kye-hoon Lee, Won-yong Lee
  • Patent number: 7248415
    Abstract: Provided is an optical deflector for deflecting radiation beams. The optical deflector includes: a peripheral region having a first effective refractive index; and a deflection pattern region having a predetermined shape and a second effective refractive index, wherein the second effective refractive index differs from the first effective refractive index. Here, due to the deflection pattern region having the predetermined shape, the radiation beams are deflected in a direction starting from a certain point. By using the optical deflector, the locus of a light source can be designed in one of various forms, such as a straight line, a circle, an ellipse, or a parabola.
    Type: Grant
    Filed: September 28, 2005
    Date of Patent: July 24, 2007
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Oh Kee Kwon, Kang Ho Kim, Hyun Soo Kim, Jong Hoi Kim, Kwang Ryong Oh
  • Patent number: 7212560
    Abstract: Provided is a tunable external cavity laser diode using a variable optical deflector wherein the variable optical deflector, in which a refractive index varies according to an electrical signal, is arranged in a triangular shape between a concave diffraction grating and a reflective mirror. Since a resonant frequency is changed using the electrical signal rather than the mechanical movement, the stable operation and continuous high-speed tenability may be enabled. In addition, when the tunable external cavity laser diode according to the present invention is implemented in an InP/InGaAsP/InP slab waveguide, a variable time determined by the carrier lifetime may be reduced to several nanoseconds or less, the miniaturization is enabled, and the manufacturing costs are significantly reduced due to the process simplification.
    Type: Grant
    Filed: December 21, 2004
    Date of Patent: May 1, 2007
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Kwang Ryong Oh, Oh Kee Kwon, Kang Ho Kim, Jong Hoi Kim, Hyun Soo Kim
  • Publication number: 20060274278
    Abstract: An illumination system and a projection system capable of enhancing light efficiency and contrast. The projection system includes a display panel from which light incident to a projection lens unit is controlled according to the rotation of a plurality of micromirrors and an asymmetric stop which adjusts an angle of effective light incident from the display panel. The illumination system emitting light to the projection system includes: one or more light source units each including a single or an array of light emitting devices and having a light exit surface with an aspect ratio different from an aspect ratio of the display panel; and an aspect ratio adjusting unit adjusting the aspect ratio of the light such that the aspect ratio of the light exit surface of each of the light source units can be equal to the aspect ratio of the display panel.
    Type: Application
    Filed: January 20, 2006
    Publication date: December 7, 2006
    Inventors: Kye-hoon Lee, Won-yong Lee, Jong-hoi Kim
  • Patent number: 7136553
    Abstract: Provided are a tunable demultiplexer and a tunable laser, having an optical deflector in which a refractive index of a core layer of a deflection pattern region having a predetermined shape varies in response to an external electrical signal so that the optical deflector deflects incident light in the radial direction.
    Type: Grant
    Filed: June 24, 2005
    Date of Patent: November 14, 2006
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Oh Kee Kwon, Kang Ho Kim, Jong Hoi Kim, Hyun Soo Kim, Kwang Ryong Oh
  • Patent number: 7133194
    Abstract: Provided is a wavelength tunable light source that can electrically tune wavelengths by monolithically integrating an optical amplifier, a beam steering unit, and a concave diffraction grating on a single substrate. A beam is deflected by the beam steering unit when an electrical signal is applied to two electrodes installed in the beam steering unit to be incident on the diffraction grating, and then diffracted by the diffraction grating according to the incidence angle such that part of the beam with a specific wavelength is reflected, thereby achieving wavelength tuning. Since the wavelength tuning is achieved electrically, the wavelength tunable light source is structurally stable and has a rapid wavelength tuning rate.
    Type: Grant
    Filed: March 24, 2006
    Date of Patent: November 7, 2006
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Oh Kee Kwon, Kang Ho Kim, Kwang Ryong Oh, Jong Hoi Kim, Eun Deok Sim, Hyun Soo Kim
  • Publication number: 20060238716
    Abstract: A light source module and an image projection apparatus employing the same are provided. The light source module includes: a light-emitting chip installed on a base to generate and emit illuminating light and having reflectivity to reflect light incident on the light-emitting chip; a reflection mirror coupled with the base to reflect the light coming from the light-emitting chip toward a front direction; and a polarization alignment unit installed on an exit end of the reflection mirror to feed back a portion of light incident on the polarization alignment unit by reflection and to polarize the light coming from the light-emitting chip in one direction and output the polarized light, wherein the fed back light of the light incident on the polarization alignment unit is reflected back to the polarization alignment unit by at least one of the reflection mirror and the base.
    Type: Application
    Filed: April 25, 2006
    Publication date: October 26, 2006
    Inventors: Kye-hoon Lee, Jong-hoi Kim, Hyun-seung Cho
  • Publication number: 20060221310
    Abstract: An illumination unit and an image projection apparatus employing the same. The illumination unit includes: a first reflective surface reflecting light incident thereon; a light-emitting device generating and emitting illuminating light; and a second reflective surface reflecting light emitted from the light-emitting device to a light source surface that includes the light-emitting device.
    Type: Application
    Filed: March 30, 2006
    Publication date: October 5, 2006
    Inventors: Jong-hoi Kim, Won-yong Lee, Young-chol Lee, Kye-hoon Lee
  • Publication number: 20060127006
    Abstract: Provided are a tunable demultiplexer and a tunable laser, having an optical deflector in which a refractive index of a core layer of a deflection pattern region having a predetermined shape varies in response to an external electrical signal so that the optical deflector deflects incident light in the radial direction.
    Type: Application
    Filed: June 24, 2005
    Publication date: June 15, 2006
    Inventors: Oh Kee Kwon, Kang Ho Kim, Jong Hoi Kim, Hyun Soo Kim, Kwang Ryong Oh
  • Publication number: 20060114420
    Abstract: An illumination unit includes first, second, third, and fourth light source units to emit first, second, third, and fourth light beams of different wavelength bands, and a hexahedral color synthesis prism to synthesize the first, second, third, and fourth light beams emitted from the first, second, third, and fourth light source units to propagate the first, second, third, and fourth light beams can propagate along the same path with respect to each other.
    Type: Application
    Filed: September 26, 2005
    Publication date: June 1, 2006
    Inventors: Jong-hoi Kim, Young-chol Lee, Kye-hoon Lee, Won-yong Lee
  • Patent number: 6980345
    Abstract: Disclosed is a high speed optical signal processor which includes a saturable absorber area including a substrate, an active layer, a clad layer and a first upper electrode which are sequentially formed on one face of the substrate, and a first lower electrode formed on the other face of the substrate; and a gain-clamped optical amplifier area including a substrate having a diffraction grating for generating a laser beam, an active layer, a clad layer and a second upper electrode which are sequentially formed on one face of the substrate, and a second lower electrode formed on the other face of the substrate, the second upper electrode being isolated from the first upper electrode of the saturable absorber area.
    Type: Grant
    Filed: September 26, 2003
    Date of Patent: December 27, 2005
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Hyun-Soo Kim, Jong-Hoi Kim, Eun-Deok Sim, Kang-Ho Kim, Oh-Kee Kwon, Kwang-Ryong Oh
  • Patent number: 6856452
    Abstract: Filter-free wavelength converters for separating and rejecting an optical input signal. A first input port couples a continuous wave (CW) light. A second input port couples an optical input signal. A multimode interference semiconductor optical amplifier (MMI-SOA) determines the output port with the input port and intensity-modulation of the CW light with the optical input signal. A first output port guides the converted signal, and a second output port guides the optical input signal.
    Type: Grant
    Filed: December 31, 2002
    Date of Patent: February 15, 2005
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Jong Hoi Kim, Kwang Ryong Oh, Yong Soon Baek, Hyun Soo Kim, Kang Ho Kim
  • Patent number: 6822591
    Abstract: The present invention relates to all-optical OR and XOR logic elements employing saturable absorbers as optical gates. Saturable absorbers are arranged in paths of the Mach-Zehnder interferometer, respectively. If the total power of an input optical signal and a continuous wave signal is higher than a transparent input power of the saturable absorbers, the input optical signal passes through the saturable absorbers, and then the optical signals through the two paths are combined, so that it is possible to obtain the operational characteristics of the OR and XOR logic elements. According to the present invention, unlike the optical logic element using a cross-phase modulation by a semiconductor optical amplifier, phase difference depending upon the input optical power is not generated between two paths, so that it is possible to alleviate a restriction of an allowable range of the input optical power.
    Type: Grant
    Filed: October 8, 2003
    Date of Patent: November 23, 2004
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Hyun Soo Kim, Jong Hoi Kim, Eun Deok Sim, Kang Ho Kim, Oh Kee Kwon, Kwang Ryong Oh
  • Publication number: 20040114644
    Abstract: Disclosed is a tunable wavelength semiconductor laser diode which comprises a FP(fabry-parrot) laser diode array for producing at least two light beams, a combiner for combining the light beams output by an end of the laser diode array, a lens for collimating the light beams output by another end thereof, a grating for diffracting the light beams collimated by the lens, and a reflector for reflecting the light beams diffracted by the grating to feed the reflected light beams back to the laser diode array.
    Type: Application
    Filed: October 30, 2003
    Publication date: June 17, 2004
    Inventors: Oh-Kee Kwon, Kang-Ho Kim, Hyun-Soo Kim, Jong-Hoi Kim, Kwang-Ryong Oh
  • Publication number: 20040109221
    Abstract: Disclosed is a high speed optical signal processor which includes a saturable absorber area including a substrate, an active layer, a clad layer and a first upper electrode which are sequentially formed on one face of the substrate, and a first lower electrode formed on the other face of the substrate; and a gain-clamped optical amplifier area including a substrate having a diffraction grating for generating a laser beam, an active layer, a clad layer and a second upper electrode which are sequentially formed on one face of the substrate, and a second lower electrode formed on the other face of the substrate, the second upper electrode being isolated from the first upper electrode of the saturable absorber area.
    Type: Application
    Filed: September 26, 2003
    Publication date: June 10, 2004
    Inventors: Hyun-Soo Kim, Jong-Hoi Kim, Eun-Deok Sim, Kang-Ho Kim, Oh-Kee Kwon, Kwang-Ryong Oh
  • Publication number: 20040085828
    Abstract: The present invention relates to all-optical OR and XOR logic elements employing saturable absorbers as optical gates. Saturable absorbers are arranged in paths of the Mach-Zehnder interferometer, respectively. If the total power of an input optical signal and a continuous wave signal is higher than a transparent input power of the saturable absorbers, the input optical signal passes through the saturable absorbers, and then the optical signals through the two paths are combined, so that it is possible to obtain the operational characteristics of the OR and XOR logic elements.
    Type: Application
    Filed: October 8, 2003
    Publication date: May 6, 2004
    Inventors: Hyun Soo Kim, Jong Hoi Kim, Eun Deok Sim, Kang Ho Kim, Oh Kee Kwon, Kwang Ryong Oh
  • Publication number: 20040075890
    Abstract: The present invention relates to an optical signal processing element capable of performing various functions of equalization of output power, wavelength converting, reshaping or reamplifying an input optical signal using an optical amplifier in which saturable absorbers are integrated, the saturable absorbers being used as an optical gate to improve the extinction ratio of the input optical signal. The saturable absorber and the optical amplifier are connected in series, and a transparent output optical power outputted from the saturable absorber is not less than a saturation input optical power of the optical amplifier.
    Type: Application
    Filed: September 22, 2003
    Publication date: April 22, 2004
    Inventors: Hyun Soo Kim, Jong Hoi Kim, Eun Deok Sim, Kang Ho Kim, Oh Kee Kwon, Kwang Ryong Oh
  • Patent number: 6639735
    Abstract: Disclosed is a method for the fabrication of a spot-size converter with a lateral-tapered waveguide (or an active layer), which utilizes a mask during a lithographic process wherein the mask has a pad that can absorb strain to be occurred during forming a lateral-tapered waveguide pattern at its distal end and the lateral-tapered waveguide is fabricated by forming the distal end on the order of about 0.6 &mgr;m in width followed by forming the lateral-tapered waveguide on the order of 0.1 &mgr;m using an wet etching. Thus, it is possible to reduce a fabrication cost because it is free from a high-resolution electron beam lithography and a stepper, and hence enhance a reproducibility of the lateral-tapered waveguide because it is free from an excessive wet etching during the use of a contact exposure equipment.
    Type: Grant
    Filed: August 10, 2001
    Date of Patent: October 28, 2003
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Kyung-Hyun Park, Jong-Hoi Kim, Yong-Soon Baek, Moon-Ho Park, Sung-Bock Kim, Kwang-Ryong Oh