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1.发明授权公开(公告)号：US10904043B2
公开(公告)日：2021-01-26
申请号：US15931821
申请日：2020-05-14
Inventor： Hun Sik Kang , Sang Rok Moon , Seung Woo Lee , In Ki Hwang , Sun Hyok Chang
Abstract: An optical transmission method for processing a signal based on direct detection includes setting, by an equalizer, an adaptive equalization coefficient by performing an equalization process during a training symbol field section in a frame of a received signal, performing, by a channel estimator, channel estimation to perform an equalization process of a soft output maximum likelihood sequence equalizer (MLSE) during the training symbol field section, driving the soft output MLSE, and compensating for, by the soft output MLSE, distortion of the received signal during a data symbol field section in the frame on the basis of the adaptive equalization coefficient and an estimated result value of a channel, and recovering, by an error corrector which allows soft-decision processing to be performed, the received signal by performing error correction on the received signal in which the distortion is compensated for.
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公开(公告)号：US11408822B2
公开(公告)日：2022-08-09
申请号：US17131063
申请日：2020-12-22
Inventor： Sun Hyok Chang , Sang Rok Moon
IPC: G01N21/3586 , G01N21/39 , G02F1/39
Abstract: A method of generating a terahertz wave and apparatuses performing the method are disclosed. According to an example embodiment, a method of generating a terahertz wave includes outputting a laser comb by modulating a laser output from a laser source based on a linearly modulated frequency of an output that is output from a frequency source, and generating a terahertz wave based on a first comb line and a second comb line selected from the laser comb.
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公开(公告)号：US10523333B2
公开(公告)日：2019-12-31
申请号：US16023187
申请日：2018-06-29
Inventor： Jie Hyun Lee , Sun Hyok Chang , Joon Young Huh , Sae-Kyoung Kang , Joon Ki Lee
Abstract: An optical signal transmission apparatus generates a multi-level optical signal from a multi-level electric signal. The optical signal transmission apparatus detects, based on a supervisory signal generated from an optical signal, an electric-to-optical (E/O) conversion characteristic of an E/O converter configured to convert an electric signal into an optical signal. For example, when the E/O converter generates a multi-level optical signal from a multi-level electric signal based on a bias signal, the optical signal transmission apparatus determines a correspondence relationship between the bias signal and the optical signal. The optical signal transmission apparatus adjusts a use range of intensities of the bias signal based on the determined correspondence relationship so that the E/O converter may linearly operate.
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Patent Agency Ranking
公开(公告)号：US11079548B2
公开(公告)日：2021-08-03
申请号：US16672600
申请日：2019-11-04
Inventor： Sun Hyok Chang , Joon Ki Lee
Abstract: An optical connection apparatus includes a position fixing portion configured to fix optical circuits each having a different end portion, while interposing a connection member that is optically imprintable between the optical circuits, and an optical-imprinting portion configured to emit light to the connection member to form a three-dimensional (3D) optical waveguide in the connection member that connects the optical circuits to each other.
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公开(公告)号：US20210273406A1
公开(公告)日：2021-09-02
申请号：US16907682
申请日：2020-06-22
Inventor： Jie Hyun Lee , Sae-Kyoung Kang , Joon Ki Lee , Sun Hyok Chang , Joon Young Huh
IPC: H01S5/06 , H01S5/40 , H01S5/0687 , H04B10/40 , H04B10/50
Abstract: An optical transceiver and a method of setting a wavelength of the optical transceiver. The optical transceiver may include a thermoelectric cooler (TEC) configured to maintain a constant operating temperature of a transmitter optical sub-assembly (TOSA) of the optical transceiver based on an installation environment of the optical transceiver, a plurality of laser diodes arranged on the top of the TEC and configured to output optical signals having different wavelengths, an optical multiplexer configured to multiplex the optical signals having different wavelengths, output through the plurality of laser diodes, and a wavelength controller configured to control the wavelengths of the optical signals output through the plurality of laser diodes such that optical outputs of the optical signals having different wavelengths, detected through the optical multiplexer, are maximized, wherein the wavelength controller may be individually arranged in one region of each of the plurality of laser diodes.
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公开(公告)号：US10523323B2
公开(公告)日：2019-12-31
申请号：US16207287
申请日：2018-12-03
Inventor： Hun Sik Kang , Sang Rok Moon , Seung-Woo Lee , Sun Hyok Chang , In Ki Hwang
IPC: H04B10/54 , H04B10/2513 , H04B10/079
Abstract: A method and apparatus for compensation of a chromatic dispersion through an optical compensation and an electronical compensation in optical communication. An optical communication method receives an optical signal, estimates a first transmission length based on a null component included in a frequency spectrum of the optical signal, optically compensates for a chromatic dispersion of the optical signal based on the first transmission length, estimates a second transmission length based on a null component included in a frequency spectrum of the compensated optical signal, and electronically compensates for a residual chromatic dispersion of the compensated optical signal based on the second transmission length.
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公开(公告)号：US09787401B2
公开(公告)日：2017-10-10
申请号：US15218240
申请日：2016-07-25
Inventor： Sun Hyok Chang , Kwang Joon Kim , Hyun Jae Lee , Chan Gyo Han
IPC: H04B10/27 , H04B10/25 , H04B10/2581 , H04B10/2587 , H04B10/272 , H04J14/08
CPC classification number: H04B10/27 , H04B10/25 , H04B10/2504 , H04B10/2581 , H04B10/2587 , H04B10/272 , H04J14/04 , H04J14/08
Abstract: A Mode Division Multiplexed Passive Optical Network (MDM-PON) apparatus includes: a non-mode selective multiplexer which includes a first end where three or more single-mode optical fibers are spaced apart from each other by a predetermined distance, and a second end where cores of the three or more single-mode optical fibers are tapered such that a gap between the three or more single-mode optical fibers is narrower than the predetermined distance while the three or more single-mode optical fibers are spaced apart from each other by an equal distance; an optical line terminal (OLT) which is connected to the second end through a few-mode fiber, and transmits a downstream optical signal; and three or more optical network units (ONUs) which is connected to the first end through the three or more single-mode optical fibers, and transmits upstream optical signals.
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公开(公告)号：US09274354B2
公开(公告)日：2016-03-01
申请号：US14090707
申请日：2013-11-26
Inventor： Sun Hyok Chang , Hwan Seok Chung
CPC classification number: G02F1/0136
Abstract: A polarization control device in accordance with an exemplary embodiment of the present invention may include a first polarization converter for converting a polarization angle of an input optical signal in response to first control voltages, a second polarization converter for converting a polarization angle of an input optical signal in response to second control voltages, and a third polarization converter for converting an optical signal received from the first polarization converter or the second polarization converter into a first output optical signal having a linear polarization state and outputting the first output optical signal.
Abstract translation: 根据本发明的示例性实施例的偏振控制装置可以包括用于响应于第一控制电压转换输入光信号的偏振角的第一偏振转换器，用于转换输入光学器件的偏振角的第二偏振转换器 响应于第二控制电压的信号;以及第三偏振转换器，用于将从第一偏振转换器或第二偏振转换器接收的光信号转换为具有线性偏振状态的第一输出光信号并输出第一输出光信号。
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