Patents by Inventor Joon Tae Ahn
Joon Tae Ahn 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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Publication number: 20140029267Abstract: Provided are a random wrinkle structure-formable compound, a composition including the same, a film including a random wrinkle structure, a method of forming the film, and an organic light emitting device including the film. A compound according to the present invention is coated and then, a film having a surface structure of random wrinkles may be simply formed through simple ultraviolet (UV) curing or thermosetting. When the film thus formed is used in an organic light emitting device, light generated from the organic light emitting device is scattered on surfaces of the random wrinkles to prevent light guide or total reflection, and thus, light is extracted to the outside. That is, a random structure disposed at the outside of the device performs a light extraction function and consequently, light efficiency of the organic light emitting device may be increased.Type: ApplicationFiled: February 28, 2013Publication date: January 30, 2014Applicant: Electronics and Telecommunications Research InstituteInventors: Jaehyun MOON, Seung Koo Park, Jeong Ik Lee, Jin Wook Shin, Doo-Hee Cho, Joo Hyun Hwang, Chul Woong Joo, Jun-Han Han, Jin Woo Huh, Joon Tae Ahn, Nam Sung Cho, Hye Yong Chu, Byoung Gon Yu
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Publication number: 20140027727Abstract: Disclosed are organic light emitting devices and methods of fabricating the same. The organic light emitting device may include light scattering parts having irregular island-shapes irregularly arranged. The organic light emitting device may further include a planarization layer, a first electrode, an organic light emitting layer, a second electrode, and an encapsulation layer. The light scattering parts may be formed using an organic solution having a low refractive index to improve light extraction efficiency of the organic light emitting device. Additionally, the light scattering parts of the irregular island-shapes may improve the light extraction efficiency of lights of all wavelengths, so as to be applied to an organic white light emitting device. The light scattering parts of the irregular island-shapes may be formed using the organic solution by a dewetting phenomenon. The light scattering parts may be formed at a temperature of about 250 degrees Celsius or less.Type: ApplicationFiled: January 22, 2013Publication date: January 30, 2014Applicant: Electronics and Telecommunications Research InstituteInventors: Bong Joon LEE, Doo-Hee Cho, Jaehyun Moon, Seung Koo Park, Jeong Ik Lee, Hye Yong Chu, Jin Wook Shin, Nam Sung Cho, Jin Woo Huh, Joon Tae Ahn, Jun-Han Han, Chul Woong Joo, Joo Hyun Hwang
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Patent number: 8611003Abstract: Provided is a double clad fiber device. The double clad fiber device includes a double clad fiber, a pump combiner, at least one first laser diode, and at least one second laser diode. The double clad fiber includes a core and a clad. The pump combiner provides pump light to the core and the clad through one end of the double clad fiber, respectively. The at least one first laser diode provides first pump light to the clad through the pump combiner. The at least one second laser diode provides second pump light to the core through the pump combiner.Type: GrantFiled: December 8, 2010Date of Patent: December 17, 2013Assignee: Electronics and Telecommunications Research InstituteInventors: Joon Tae Ahn, Hong-Seok Seo, Bong Je Park, Dae Kon Oh
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Publication number: 20130243377Abstract: The inventive concept provides optic couplers, optical fiber laser devices, and active optical modules using the same. The optic coupler may include a first optical fiber having a first core and a first cladding surrounding the first core, a second optical fiber having a second core transmitting a signal light to the first optical fiber and a third cladding surrounding the second core, third optical fibers transmitting pump-light to the first optical fiber in a direction parallel to the second optical fiber; and a connector connected between the first optical fiber and the second optical fiber, the connector extending the third optical fibers disposed around the second optical fiber toward the first optical fiber, the connector comprising a third core connected between the first core and the second core and a fifth cladding surrounding the third core.Type: ApplicationFiled: September 13, 2012Publication date: September 19, 2013Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Hong-Seok SEO, Bong Je Park, Joon Tae Ahn, Jung-Ho Song
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Publication number: 20120213235Abstract: Provided are an optical coupler and an active optical module including the same. The optical coupler includes at least one first optical fiber, a second optical fiber, and a hollow optical block. The at least one first optical fiber transfers pump light. The second optical fiber includes a cladding with a facet enlarged from a first outer diameter to a second outer diameter, and passes the pump light which is transferred through the first optical fiber. The hollow optical block includes a through hole, an incident surface, and a coupling surface. The through hole passes the cladding with the first outer diameter. The incident surface is connected to the first optical fiber at a side end of the through hole. The coupling surface is joined to the facet of the second optical fiber at the other side end of the through hole facing the incident surface.Type: ApplicationFiled: January 9, 2012Publication date: August 23, 2012Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Hong-Seok SEO, Joon Tae AHN, Bong Je PARK, Jung-Ho SONG
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Publication number: 20120051692Abstract: There are provided an optical fiber coupler configured to improve or optimize optical efficiency and coupling efficiency, a method of manufacturing the optical fiber coupler, and an active optical module. The optical fiber coupler includes a first optical fiber and second optical fibers. The first optical fiber includes a first core and a first cladding surrounding the first core, and the second optical fibers are coupled to the first cladding. The first cladding includes a first coupling facet to which ends of the second optical fibers are coupled.Type: ApplicationFiled: February 1, 2011Publication date: March 1, 2012Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Hong-Seok SEO, Joon Tae Ahn, Bong Je Park
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Patent number: 8077382Abstract: Provided is a gain-clamped (GC) optical amplifier using a fiber Raman amplifier (FRA) having a Raman cavity. The FRA having a Raman cavity comprises a Raman fiber module (RFM) amplifying and outputting an input optical signal and a resonant cavity generating a Raman laser and a gain clamping laser (GC laser), wherein the resonant cavity is formed as a feedback loop between an input terminal and an output terminal of the RFM. Accordingly, a gain of an optical signal propagating along a core of RFM keeps a constant value regardless of input signal intensity by generating the GC laser for gain clamping between a wavelength band of the Raman laser and a gain band of input signals.Type: GrantFiled: June 4, 2008Date of Patent: December 13, 2011Assignee: Electronics and Telecommunications Research InstituteInventors: Hong-Seok Seo, Joon Tae Ahn, Bong Je Park, Woon Jin Chung
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Publication number: 20110261580Abstract: Provided are an optical fiber coupler, a method of manufacturing the same, and an active optical module. The optical fiber coupler comprises a first core, a first optical fiber, and a plurality of second optical fibers. The first optical fiber comprises a first cladding surrounding a first core. The plurality of second optical fibers have a tapering region of a cylindrical shape and surround the first cladding of the first optical fiber. Here, the first core has the same diameter within the tapering region.Type: ApplicationFiled: November 15, 2010Publication date: October 27, 2011Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Hong-Seok SEO, Joon Tae AHN, Bong Je PARK
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Publication number: 20110141758Abstract: Provided are an optical coupler, which can improve miniaturization and integration, and an active optical module comprising the same. The optical coupler comprises a hollow optical block having a through hole formed to pass an optical fiber therethrough. The hollow optical block comprises at least one incidence plane, at least one internal reflection plane, and at least one tapering region. The incidence plane is disposed at the bottom of the hollow optical block, which is parallel to the through hole, to incident-transmit light. The internal reflection plane is disposed at the top of the hollow optical block, which is opposite to the incidence plane, to reflect the light, which is received from the incidence plane, into the hollow optical block. The tapering region is configured to concentrate the light on the optical fiber in the through hole. The tapering region is formed such that the outer diameter of the hollow optical block decreases away from the internal reflection plane and the incidence plane.Type: ApplicationFiled: November 18, 2010Publication date: June 16, 2011Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Hong-Seok SEO, Joon Tae Ahn, Bong Je Park, Dae Kon Oh, Jung-Ho Song
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Publication number: 20110134512Abstract: Provided is a double clad fiber device. The double clad fiber device includes a double clad fiber, a pump combiner, at least one first laser diode, and at least one second laser diode. The double clad fiber includes a core and a clad. The pump combiner provides pump light to the core and the clad through one end of the double clad fiber, respectively. The at least one first laser diode provides first pump light to the clad through the pump combiner. The at least one second laser diode provides second pump light to the core through the pump combiner.Type: ApplicationFiled: December 8, 2010Publication date: June 9, 2011Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Joon Tae AHN, Hong-Seok Seo, Bong Je Park, Dae Kon Oh
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Patent number: 7957432Abstract: A light coupler emitting a high power laser with a high beam quality and a fiber laser system including the light coupler is disclosed. The light coupler includes a first optical fiber bundle comprising a plurality of first optical fibers having either a single-mode core or a few-mode core and a second optical fiber, which guides multi-mode beams and is connected to the first optical fiber bundle. The optical fiber laser system includes a light coupler having a first optical fiber bundle comprising a plurality of first optical fiber having either a single-mode core or a few-mode core and a second optical fiber, which is connected to the first optical fiber bundle, is either a single cladding optical fiber or a double cladding optical fiber, and guides multi-mode beams, and one or more gain medium optical fiber, which is connected to the light coupler and emits light.Type: GrantFiled: February 24, 2009Date of Patent: June 7, 2011Assignee: Electronics and Telecommunications Research InstituteInventors: Hong Seok Seo, Joon Tae Ahn, Bong Je Park
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Patent number: 7738165Abstract: Provided is an all-optical gain-clamped fiber amplifier, comprising transmission and isolation means for periodically transmitting an optical signal or reflecting amplified spontaneous emission (ASE) back to a gain medium. The transmission and isolation means can be embodied by an optical interleaver or a number of optical fiber Bragg gratings. Accordingly, an optical signal can be amplified across the entire C-band, and an ASE reflector-based gain-clamped fiber amplifier having a wider dynamic range than conventional amplifiers can be implemented.Type: GrantFiled: February 17, 2009Date of Patent: June 15, 2010Assignee: Electronics and Telecommunications Research InstituteInventors: Joon Tae Ahn, Hong Seok Seo, Woon Jin Chung, Bong Je Park
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Publication number: 20100111118Abstract: A light coupler emitting a high power laser with a high beam quality and a fiber laser system including the light coupler is disclosed. The light coupler includes a first optical fiber bundle comprising a plurality of first optical fibers having either a single-mode core or a few-mode core and a second optical fiber, which guides multi-mode beams and is connected to the first optical fiber bundle. The optical fiber laser system includes a light coupler having a first optical fiber bundle comprising a plurality of first optical fiber having either a single-mode core or a few-mode core and a second optical fiber, which is connected to the first optical fiber bundle, is either a single cladding optical fiber or a double cladding optical fiber, and guides multi-mode beams, and one or more gain medium optical fiber, which is connected to the light coupler and emits light.Type: ApplicationFiled: February 24, 2009Publication date: May 6, 2010Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Hong Seok Seo, Joon Tae Ahn, Bong Je Park
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Patent number: 7646951Abstract: Provided is an apparatus for manufacturing an optical fiber Bragg grating.Type: GrantFiled: November 20, 2007Date of Patent: January 12, 2010Assignee: Electronics and Telecommunications Research InstituteInventors: Joon Tae Ahn, Hong Seok Seo, Bong Je Park
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Publication number: 20090285246Abstract: Provided is a multi-resonant optical fiber laser system including a multi-resonator having an optical fiber containing at least one rare-earth element and an optical fiber inducing the stimulated Raman effect. The multi-resonant optical fiber laser system includes a pump light source irradiating pump light, a first resonator, which includes a first gain medium optical fiber containing at least one rare-earth element and first and second reflectors disposed to face each other across the first gain medium optical fiber and irradiates first laser radiation having a first wavelength by converting the pump light using the first gain medium optical fiber, a second resonator, which includes a second gain medium optical fiber inducing the stimulated Raman effect and third and fourth reflectors disposed to face each other across the second gain medium optical fiber and irradiates second laser radiation having a second wavelength by converting the first laser radiation using the second gain medium optical fiber.Type: ApplicationFiled: September 18, 2008Publication date: November 19, 2009Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Hong Seok Seo, Joon Tae Ahn, Bong Je Park, Taehyoung Zyung
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Patent number: 7616668Abstract: Provided is a fiber laser system including fiber containing dysprosium. The fiber laser system uses 1.7-?m pump light. A resonator of the fiber laser system includes a dichroic mirror, a partial reflection mirror, and/or an FBG. Therefore, the fiber laser system can provide 3-?m laser light and have high light pumping efficiency and high output power. The fiber laser system includes: fiber including dysprosium, a pump light source disposed at a side of the fiber and emitting pump light having a wavelength exciting electrons of the dysprosium from a ground energy level 6H15/2 to an energy level 6H11/2; a first reflection member, disposed between the fiber and the pump light source, transmitting the pump light, and reflecting first lasing light having a first wavelength; and a second reflection member, disposed at a side opposite to the pump light source with respect to the fiber, transmitting a portion of the first lasing light.Type: GrantFiled: February 7, 2008Date of Patent: November 10, 2009Assignee: Electronics and Telecommunications Research InstituteInventors: Joon Tae Ahn, Hong-Seok Seo, Bong Je Park
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Patent number: 7551348Abstract: Provided are a tellurite glass composite, an optical waveguide, and an optical amplifier using the tellurite glass composite. The tellurite glass composite includes an entire composite including 25 (mol %)?TeO2?90 (mol %), 1 (mol %)?T1O3?55 (mol %) or 1 (mol %)?T2O3?40 (mol %), 0 (mol %)?ZnO?35 (mol %), 0 (mol %)?M2O?35 (mol %), and 0 (mol %)?Bi2O3?20 (mol %). Here, T1 includes a transition metal Mo, T2 includes a transition metal W, M2O includes Li2O, Na2O, or two or more of Li2O, Na2O, K2O, Rb2O, and Cs2O including metals having +1 valence electrons, and amounts of M2O and ZnO are not simultaneously “0”.Type: GrantFiled: December 8, 2005Date of Patent: June 23, 2009Assignee: Electronics and Telecommunications Research InstituteInventors: Woon Jin Chung, Bong Je Park, Hong Seok Seo, Joon Tae Ahn
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Publication number: 20090147350Abstract: Provided is an all-optical gain-clamped fiber amplifier, comprising transmission and isolation means for periodically transmitting an optical signal or reflecting amplified spontaneous emission (ASE) back to a gain medium. The transmission and isolation means can be embodied by an optical interleaver or a number of optical fiber Bragg gratings. Accordingly, an optical signal can be amplified across the entire C-band, and an ASE reflector-based gain-clamped fiber amplifier having a wider dynamic range than conventional amplifiers can be implemented.Type: ApplicationFiled: February 17, 2009Publication date: June 11, 2009Inventors: Joon Tae AHN, Hong Seok SEO, Woon Jin CHUNG, Bong Je PARK
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Patent number: 7511881Abstract: Provided is an all-optical gain-clamped fiber amplifier, comprising transmission and isolation means for periodically transmitting an optical signal or reflecting amplified spontaneous emission (ASE) back to a gain medium. The transmission and isolation means can be embodied by an optical interleaver or a number of optical fiber Bragg gratings. Accordingly, an optical signal can be amplified across the entire C-band, and an ASE reflector-based gain-clamped fiber amplifier having a wider dynamic range than conventional amplifiers can be implemented.Type: GrantFiled: October 6, 2005Date of Patent: March 31, 2009Assignee: Electronics and Telecommunications Research InstituteInventors: Joon Tae Ahn, Hong Seok Seo, Woon Jin Chung, Bong Je Park
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Publication number: 20090046353Abstract: Provided is a gain-clamped (GC) optical amplifier using a fiber Raman amplifier (FRA) having a Raman cavity. The FRA having a Raman cavity comprises a Raman fiber module (RFM) amplifying and outputting an input optical signal and a resonant cavity generating a Raman laser and a gain clamping laser (GC laser), wherein the resonant cavity is formed as a feedback loop between an input terminal and an output terminal of the RFM. Accordingly, a gain of an optical signal propagating along a core of RFM keeps a constant value regardless of input signal intensity by generating the GC laser for gain clamping between a wavelength band of the Raman laser and a gain band of input signals.Type: ApplicationFiled: June 4, 2008Publication date: February 19, 2009Applicant: Electronics and Telecommunications Research InstituteInventors: Hong-Seok SEO, Joon Tae Ahn, Bong Je Park, Woon Jin Chung