Patents by Inventor Yong-Tak Lee
Yong-Tak Lee 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: 9397479Abstract: The present invention relates to a silicon DBR structure-integrated light device, and a preparation method thereof, and more specifically, to a silicon DBR structure-integrated light device or vertical cavity light emitting diode, and a preparation method thereof, enabling preparation by a small number of layers and capable of reducing process time and costs due to a large contrast in refractive index of a silicon DBR structure formed by depositing silicon in a slanted or vertical manner.Type: GrantFiled: November 30, 2012Date of Patent: July 19, 2016Assignee: GWANGJU INSTITUTE OF SCIENCE AND TECHNOLOGYInventors: Yong-Tak Lee, Sung Joon Jang, Young Min Song
-
Patent number: 9190545Abstract: An optical device is provided including an active layer having two outer barriers and a coupled quantum well between the two outer barriers. The coupled quantum well includes a first quantum well layer, a second quantum well layer, a third quantum well layer, a first coupling barrier between the first quantum well layer and the second quantum well layer, and a second coupling barrier between the second quantum well layer and the third quantum well layer. A thickness of the first quantum well layer and a thickness of the third quantum well layer are each different from a thickness of the second quantum well layer. Also, an energy level of the first quantum well layer and an energy level of the third quantum well layer are each different from an energy level of the second quantum well layer.Type: GrantFiled: May 21, 2014Date of Patent: November 17, 2015Assignees: SAMSUNG ELECTRONICS CO., LTD., GWANGJU INSTITUTE OF SCIENCE AND TECHNOLOGYInventors: Yong-chul Cho, Yong-tak Lee, Chang-young Park, Byung-hoon Na, Yong-hwa Park, Gun-wu Ju
-
Patent number: 9151917Abstract: The present invention relates to the apparatus and method for optical interconnection. The present invention provides an optical interconnection structure comprising: a substrate on which double side perforated multi-hole through a predetermined region is formed; bottom hole which is etched and tapered for optical fiber array is bigger than upper hole which is etched for the optical devices. The present invention provides the optical interconnection structure that can facilitate the optical interconnection between the active optoelectronic devices that transmit/receive the optical signals and the optical fiber array, making it possible to align easily and acutely between the optical devices and optical fiber array.Type: GrantFiled: July 12, 2013Date of Patent: October 6, 2015Assignee: YTEL PHOTONICS INC.Inventor: Yong Tak Lee
-
Patent number: 9123832Abstract: A method of fabricating nanostructure for antireflection and a method of fabricating a photo device integrated with the nanostructure for antireflection are provided. The fabrication of the nanostructure for antireflection includes coating a solution containing a combination of metal ions with organic or inorganic ions on a substrate, sintering the coated solution using an annealing process to grow nanoscale metal particles, and chemically etching the substrate using the metal particles as mask or accelerator to form a subwavelength nanostructure on the surface of the substrate, thereby manufacturing the nanostructure for antireflection without an apparatus requiring a vacuum state using a simple method for a short amount of time to minimize reflection of light at an interface between a semiconductor material and the air, and producing a photo device having good luminous efficiency and performance at low cost in large quantities by applying it to the photo device.Type: GrantFiled: November 30, 2010Date of Patent: September 1, 2015Assignee: Gwangju Institute of Science and TechnologyInventors: Chan Il Yeo, Yong Tak Lee, Young Min Song
-
Patent number: 9082909Abstract: Provided is an optical device which includes an active layer which includes at least two outer barriers and at least one coupled quantum well, each of the at least one coupled quantum well is sandwiched between the at least two outer barriers. Each of the at least one coupled quantum well includes at least three quantum well layers and at least two coupling barriers interposed between the at least three quantum layers. The at least two coupling barriers have a potential energy which is higher than a ground level and is lower than energy levels of the at least two outer barriers.Type: GrantFiled: January 6, 2014Date of Patent: July 14, 2015Assignees: SAMSUNG ELECTRONICS CO., LTD., GWANGJU INSTITUTE OF SCIENCE AND TECHNOLOGYInventors: Yong-chul Cho, Yong-tak Lee, Chang-young Park, Byung-hoon Na, Yong-hwa Park, Gun-wu Ju, Hee-ju Chio
-
Patent number: 9051178Abstract: A transmissive light modulator including a first reflection layer; a first active layer, arranged on the first reflection layer and including a plurality of quantum well layers and a plurality of barrier layers; a second reflection layer arranged on the first active layer; a second active layer, arranged on the second reflection layer and including a plurality of quantum well layers and a plurality of barrier layers; and a third reflection layer arranged on the second active layer, wherein the first reflection layer and the third reflection layer are each doped with a first type dopant, and the second reflection layer is doped with a second type dopant, which is electrically opposite to the first type dopant.Type: GrantFiled: September 14, 2012Date of Patent: June 9, 2015Assignees: GWANGJU INSTITUTE OF SCIENCE AND TECHNOLOGY, SAMSUNG ELECTRONICS CO., LTD.Inventors: Yong-chul Cho, Yong-tak Lee, Jang-woo You, Byung-hoon Na, Yong-hwa Park, Chang-young Park, Hee-ju Chio, Gun-wu Ju
-
Publication number: 20150153628Abstract: An optical modulator includes: a bottom reflective layer; an active layer which is disposed on the bottom reflective layer and includes a multiple quantum well layer; and a top reflective layer which is disposed on the active layer, the top reflective layer including a first top reflective layer which is disposed on the active layer, a first cavity layer which is disposed on the first top reflective layer, a second top reflective layer which is disposed on the first cavity layer, a second cavity layer which is disposed on the second top reflective layer, and a third top reflective layer which is disposed on the second cavity layer. When a center wavelength of an incident light to be modulated is ?, the active layer and the first and second cavity layers have an optical thickness that is an integer multiple of ?/2 to provide an individual resonant cavity.Type: ApplicationFiled: February 12, 2015Publication date: June 4, 2015Applicants: GWANGJU INSTITUTE OF SCIENCE AND TECHNOLOGY, SAMSUNG ELECTRONICS CO., LTD.Inventors: Yong-Chul CHO, Yong-Tak LEE, Yong-Hwa PARK, Byung-Hoon NA
-
Publication number: 20150138620Abstract: A transmissive image modulator for allowing image modulation over a wide bandwidth with multiple Fabry-Perot resonant modes and multiple absorption modes is provided. The transmissive image modulator includes a lower reflection layer; an active layer disposed on the lower reflection layer, including multiple quantum well layers and multiple barrier layers; an upper reflection layer disposed on the active layer; and at least one micro-cavity layer disposed in at least one of the lower and upper reflection layer. The active layer and the at least one micro-cavity layer have thicknesses of a multiple of ?/2, where ? is a resonant wavelength.Type: ApplicationFiled: December 16, 2014Publication date: May 21, 2015Applicants: GWANGJU INSTITUTE OF SCIENCE AND TECHNOLOGY, SAMSUNG ELECTRONICS CO., LTD.Inventors: Yong-chul CHO, Yong-tak LEE, Byung-hoon NA, Chang-young PARK, Yong-hwa PARK, Jang-woo YOU, Hee-ju CHOI
-
Publication number: 20150131691Abstract: The present invention relates to a silicon DBR structure-integrated light device, and a preparation method thereof, and more specifically, to a silicon DBR structure-integrated light device or vertical cavity light emitting diode, and a preparation method thereof, enabling preparation by a small number of layers and capable of reducing process time and costs due to a large contrast in refractive index of a silicon DBR structure formed by depositing silicon in a slanted or vertical manner.Type: ApplicationFiled: November 30, 2012Publication date: May 14, 2015Inventors: Yong-Tak Lee, Sung Joon Jang, Young Min Song
-
Publication number: 20150123077Abstract: An optical device is provided including an active layer having two outer barriers and a coupled quantum well between the two outer barriers. The coupled quantum well includes a first quantum well layer, a second quantum well layer, a third quantum well layer, a first coupling barrier between the first quantum well layer and the second quantum well layer, and a second coupling barrier between the second quantum well layer and the third quantum well layer. A thickness of the first quantum well layer and a thickness of the third quantum well layer are each different from a thickness of the second quantum well layer. Also, an energy level of the first quantum well layer and an energy level of the third quantum well layer are each different from an energy level of the second quantum well layer.Type: ApplicationFiled: May 21, 2014Publication date: May 7, 2015Applicants: GWANGJU INSTITUTE OF SCIENCE AND TECHNOLOGY, SAMSUNG ELECTRONICS CO., LTD.Inventors: Yong-chul CHO, Yong-tak LEE, Chang-young PARK, Byung-hoon NA, Yong-hwa PARK, Gun-wu JU
-
Patent number: 8879601Abstract: Provided is a multi-wavelength laser diode module including a plurality of laser diodes having different consecutive light emission wavelength regions, a plurality of filters respectively corresponding to the plurality of laser diodes, and an optical waveguide path that transmits light emitted from the plurality of laser diodes to the plurality of filters and collects light reflected or transmitted by the plurality of filters to transmit the collected light to the outside.Type: GrantFiled: November 1, 2013Date of Patent: November 4, 2014Assignee: Ytel Photonics Inc.Inventor: Yong Tak Lee
-
Publication number: 20140191196Abstract: Provided is an optical device which includes an active layer which includes at least two outer barriers and at least one coupled quantum well, each of the at least one coupled quantum well is sandwiched between the at least two outer barriers. Each of the at least one coupled quantum well includes at least three quantum well layers and at least two coupling barriers interposed between the at least three quantum layers. The at least two coupling barriers have a potential energy which is higher than a ground level and is lower than energy levels of the at least two outer barriers.Type: ApplicationFiled: January 6, 2014Publication date: July 10, 2014Applicants: GWANGJU INSTITUTE OF SCIENCE AND TECHNOLOGY, SAMSUNG ELECTRONICS CO., LTD.Inventors: Yong-chul CHO, Yong-tak LEE, Chang-young PARK, Byung-hoon NA, Yong-hwa PARK, Gun-wu JU, Hee-ju CHIO
-
Patent number: 8760754Abstract: A wavelength-tunable laser system includes an optical fiber collimator array having at least two ports, an optical amplifier connected to one port of an optical fiber, an optical coupler for coupling light incident from the optical amplifier and transmitting the coupled light to another port, a diffraction grating plate for guiding each wavelength component of light incident from the optical fiber collimator array in a different direction, and an Opto-Very Large Scale Integration (Opto-VLSI) processor.Type: GrantFiled: June 4, 2010Date of Patent: June 24, 2014Assignee: Ytel Photonics Inc.Inventors: Yong Tak Lee, Feng Xiao, Kamal Alameh
-
Patent number: 8647903Abstract: A method of fabricating an antireflective grating pattern and a method of fabricating an optical device integrated with an antireflective grating pattern are provided. The method of fabricating the antireflective grating pattern includes forming a photoresist (PR) pattern on a substrate using a hologram lithography process, forming a PR lens pattern having a predetermined radius of curvature by reflowing the PR pattern, and etching the entire surface of the substrate including the PR lens pattern to form a wedge-type or parabola-type antireflective subwavelength grating (SWG) pattern having a pointed tip on a top surface of the substrate. In this method, a fabrication process is simplified, the reflection of light caused by a difference in refractive index between the air and a semiconductor material can be minimized, and the antireflective grating pattern can be easily applied to optical devices.Type: GrantFiled: December 22, 2009Date of Patent: February 11, 2014Assignee: Gwangju Institute of Science and TechnologyInventors: Yong Tak Lee, Young Min Song
-
Publication number: 20130342894Abstract: The present invention relates to a wavelength conversion laser system and provides a wavelength conversion laser system including a semiconductor optical amplifier, an optical condenser that condenses light emitted from the optical amplifier, a diffraction grating plate that induces wavelength components of the light having passed through the optical condenser in different directions, and an optical very large scale integration (VLSI) processor.Type: ApplicationFiled: August 23, 2013Publication date: December 26, 2013Applicant: Ytel Photonics Inc.Inventor: Yong Tak Lee
-
Publication number: 20130336611Abstract: An optical device includes a first waveguide extended in one direction. A second waveguide is positioned at a side of the first waveguide. The second waveguide includes the first conductive semiconductor layer, the second conductive semiconductor layer, and the undoped semiconductor layer positioned between the first conductive semiconductor layer and the second conductive semiconductor layer, wherein the undoped semiconductor layer has a refractive index larger than those of the first conductive semiconductor layer and the second conductive semiconductor layer. First and second electrodes are connected to the first conductive semiconductor layer and the second conductive semiconductor layer of the second waveguide, respectively.Type: ApplicationFiled: June 17, 2013Publication date: December 19, 2013Inventors: YONG-TAK LEE, Sooraj Ravindran, Chan IL Yeo
-
Publication number: 20130301982Abstract: The present invention relates to the apparatus and method for optical interconnection. The present invention provides an optical interconnection structure comprising: a substrate on which double side perforated multi-hole through a predetermined region is formed; bottom hole which is etched and tapered for optical fiber array is bigger than upper hole which is etched for the optical devices. The present invention provides the optical interconnection structure that can facilitate the optical interconnection between the active optoelectronic devices that transmit/receive the optical signals and the optical fiber array, making it possible to align easily and acutely between the optical devices and optical fiber array.Type: ApplicationFiled: July 12, 2013Publication date: November 14, 2013Inventor: Yong Tak Lee
-
Patent number: 8492863Abstract: Optical modulator having wide bandwidth based on Fabry-Perot resonant reflection is disclosed. The optical modulator includes: a bottom Distributed Bragg Reflector (DBR) layer; a top DBR layer including at least one layer, and a modified layer; and an active layer disposed between bottom and top DBR layers, wherein the at least one layer includes at least one pair of a first refractive index layer having a first refractive index and a second refractive index layer having a second refractive index, the modified layer includes at least one pair of a third refractive index layer having a third refractive index and a fourth refractive index layer having a fourth refractive index, the third and the fourth refractive indexes being different, and at least one of the third and the fourth refractive index layers has a second optical thickness that is not ?/4 or that is not an odd multiple thereof.Type: GrantFiled: November 2, 2010Date of Patent: July 23, 2013Assignees: Samsung Electronics Co., Ltd., Gwangju Institute of Science and TechnologyInventors: Yong-chul Cho, Yong-tak Lee, Yong-hwa Park, Byung-hoon Na, Kwang-mo Park, Chang-soo Park
-
Publication number: 20130175500Abstract: A transmissive light modulator including a first reflection layer; a first active layer, arranged on the first reflection layer and including a plurality of quantum well layers and a plurality of barrier layers; a second reflection layer arranged on the first active layer; a second active layer, arranged on the second reflection layer and including a plurality of quantum well layers and a plurality of barrier layers; and a third reflection layer arranged on the second active layer, wherein the first reflection layer and the third reflection layer are each doped with a first type dopant, and the second reflection layer is doped with a second type dopant, which is electrically opposite to the first type dopant.Type: ApplicationFiled: September 14, 2012Publication date: July 11, 2013Applicants: GWANGJU INSTITUTE OF SCIENCE AND TECHNOLOGY, SAMSUNG ELECTRONICS CO., LTD.Inventors: Yong-chul CHO, Yong-tak LEE, Jang-woo YOU, Byung-hoon NA, Yong-hwa PARK, Chang-young PARK, Hee-ju CHIO, Gun-wu JU
-
Publication number: 20130128362Abstract: A micro/nano combined structure, a manufacturing method of a micro/nano combined structure, and a manufacturing method of an optical device having a micro/nano combined structure integrated therewith, the method comprising: forming a micro structure on a substrate; depositing a metal thin film on the substrate on which the micro structure is formed; heat treating and transforming the metal thin film into metal particles; and using the metal particles as a mask to form a non-reflective nanostructure having a frequency below that of light wavelengths and a sharp wedge-shaped end, on the top surface of the substrate on which the micro structure is formed, and etching the front surface of the substrate on which the micro structure is formed. The manufacturing process is simple, light reflectivity that occurs wherein a difference in refractive indices of air and semiconductor material can be minimized, and is easily applied to the optical device field.Type: ApplicationFiled: July 29, 2011Publication date: May 23, 2013Applicant: GWANGJU INSTITUTE OF SCIENCE AND TECHNOLOGYInventors: Young Min Song, Yong Tak Lee