Patents by Inventor Gap Youl Lyu
Gap Youl Lyu 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: 7986886Abstract: An optical signal detector is provided that detects an optical signal from an optical source using a plurality of optical sensors having different wavelength selectivities, thereby determining the peak wavelength of the optical signal and measuring the power of an optical signal corresponding to the peak wavelength. According to the optical signal detector, separate optical filters are not required and space and costs attributable to the installation of the optical filters can be saved, and thus there are effects in that the overall size and manufacturing costs of the device can be reduced.Type: GrantFiled: July 25, 2008Date of Patent: July 26, 2011Assignee: Wooriro Optical Telecom Co., Ltd.Inventors: Chan Yong Park, Gap Youl Lyu, Kil Hun Koo, Min Hee Kang
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Patent number: 7619727Abstract: The present invention relates to a light wavelength and intensity measuring device. The device automatically measures a center wavelength of the light source and an intensity of the light corresponding to the center wavelength by using a main photodetector, at least one optical filter, and at least one sub photodetector when the light source is connected to the device. The main photodetector detects the intensity of the light applied by the light source, the optical filter transmits the light corresponding to a prediscriminated transmission wavelength, and the sub photodetector detects the intensity of the light transmitted through the optical filter. Therefore, the light intensity is more accurately measured by calibrating the intensity according to the wavelength.Type: GrantFiled: June 7, 2006Date of Patent: November 17, 2009Assignee: Raybit Systems Inc.Inventors: Gap Youl Lyu, Kilhun Koo, Min Hee Kang, Ba Cao
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Publication number: 20090175623Abstract: An optical signal detector is provided that detects an optical signal from an optical source using a plurality of optical sensors having different wavelength selectivities, thereby determining the peak wavelength of the optical signal and measuring the power of an optical signal corresponding to the peak wavelength. According to the optical signal detector, separate optical filters are not required and space and costs attributable to the installation of the optical filters can be saved, and thus there are effects in that the overall size and manufacturing costs of the device can be reduced.Type: ApplicationFiled: July 25, 2008Publication date: July 9, 2009Applicants: PHOTONIC SOLUTION, INC., RAYBIT SYSTEMS, INC.Inventors: Chan Yong PARK, Gap Youl LYU, Kil Hun KOO, Min Hee KANG
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Patent number: 7512166Abstract: The present invention relates to an optical power and extinction ratio controlling device and method. An optical signal output from a light source is detected and optical power and extinction ratio of the light source are controlled. In detail, a feedback signal is provided to the light source to automatically control the bias current based on a DC signal output by a photodetector detecting the optical signal. Therefore, the optical output of the light source is maintained. Also, an optical signal output by the photodetector is converted into a predetermined times DC signal, and a feedback signal is provided to the light source to automatically control the modulation current based on the DC signal. Therefore, the extinction ratio of the light source is maintained. As a result, the extinction ratio is automatically maintained to satisfy the change of condition and the characteristic of light source, thereby maintaining quality optical outputs.Type: GrantFiled: December 1, 2006Date of Patent: March 31, 2009Assignee: Raybit SystemsInventors: Gap Youl Lyu, Kilhun Koo, Min Hee Kang
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Publication number: 20090033923Abstract: The present invention relates to a light wavelength and intensity measuring device. The device automatically measures a center wavelength of the light source and an intensity of the light corresponding to the center wavelength by using a main photodetector, at least one optical filter, and at least one sub photodetector when the light source is connected to the device. The main photodetector detects the intensity of the light applied by the light source, the optical filter transmits the light corresponding to a prediscriminated transmission wavelength, and the sub photodetector detects the intensity of the light transmitted through the optical filter. Therefore, the light intensity is more accurately measured by calibrating the intensity according to the wavelength.Type: ApplicationFiled: June 7, 2006Publication date: February 5, 2009Inventors: Gap Youl Lyu, Kilhun Koo, Min Hee Kang, Ba Cao
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Publication number: 20080128587Abstract: The present invention relates to an optical power and extinction ratio controlling device and method. An optical signal output from a light source is detected and optical power and extinction ratio of the light source are controlled. In detail, a feedback signal is provided to the light source to automatically control the bias current based on a DC signal output by a photodetector detecting the optical signal. Therefore, the optical output of the light source is maintained. Also, an optical signal output by the photodetector is converted into a predetermined times DC signal, and a feedback signal is provided to the light source to automatically control the modulation current based on the DC signal. Therefore, the extinction ratio of the light source is maintained. As a result, the extinction ratio is automatically maintained to satisfy the change of condition and the characteristic of light source, thereby maintaining quality optical outputs.Type: ApplicationFiled: December 1, 2006Publication date: June 5, 2008Applicant: Raybit Systems Inc.Inventors: Gap Youl Lyu, Kilhun Koo, Min Hee Kang
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Patent number: 6748172Abstract: A multi-channel light source generator has a pumping laser source for generating a pumping laser having a predetermined wavelength, a multi-channel light source generating device for generating multi-channel light sources using the pumping laser, a light separating device for separating the pumping laser and the multi-channel light sources, a demultiplexing device for separating the multi-channel light sources into a plurality of individual light sources, an intensity adjusting device for adjusting an intensity of the individual light sources, and a multiplexing device for combining the individual light sources outputted from the intensity adjusting device.Type: GrantFiled: December 21, 2000Date of Patent: June 8, 2004Assignee: Electronics and Telecommunications Research InstituteInventor: Gap Youl Lyu
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Patent number: 6369926Abstract: A multichannel light source wavelength and strength stabilizing apparatus and a method thereof are disclosed.Type: GrantFiled: August 19, 1998Date of Patent: April 9, 2002Assignees: Electronics and Telecommunications Research Institute, Korea TelecomInventors: Gap Youl Lyu, Hyun Jae Lee, Seo Yeon Park, Jong Hyun Lee
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Publication number: 20010015840Abstract: The invention relates to a WDM optical communication system, more particularly, to a multi-channel light source generator in a WDM optical communication system using a single multiplexer/demultiplexer. According to the present invention, the multi-channel light source generator is provided to include a pumping laser source for generating a pumping laser having a predetermined wavelength, a multi-channel light source generating means for generating multi-channel light sources using the pumping laser, a light separating means for separating the pumping laser and the multi-channel light sources, a demultiplexing means for separating the multi-channel light sources into a plurality of individual light sources, an intensity adjusting means for adjusting an intensity of the individual light sources, and a multiplexing mean for combining the individual light sources outputted from the intensity adjusting means.Type: ApplicationFiled: December 21, 2000Publication date: August 23, 2001Inventor: Gap Youl Lyu
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Patent number: 6118562Abstract: A wavelength aligning apparatus using an arrayed waveguide grating (AWG), and particularly, to a wavelength aligning apparatus using an arrayed waveguide grating which is capable of aligning optical sources using a transmission characteristic of an arrayed waveguide grating in a wavelength alignment method.Type: GrantFiled: December 5, 1997Date of Patent: September 12, 2000Assignees: Electronics and Telecommunications Research Institute, Korea TelecomInventors: Hyun Jae Lee, Gap Youl Lyu, Seo Yeon Park
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Patent number: 5764359Abstract: An apparatus for measuring the linewidth of a laser is disclosed in which the linewidth of a laser is measured in a wide range from a narrow linewidth to a wide linewidth by utilizing frequency-shifted rays based on a stimulated Brillouin scattering within an optical fiber in an easy and efficient manner.Type: GrantFiled: March 21, 1997Date of Patent: June 9, 1998Assignees: Electronics and Telecommunications Research Institute, Korea TelecomInventors: Gap-Youl Lyu, Sang-Soo Lee, Dong-Ho Lee, Chang-Soo Park