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公开(公告)号：US11860376B2
公开(公告)日：2024-01-02
申请号：US16415708
申请日：2019-05-17
发明人： Kap-Joong Kim , Chun Ju Youn , Heasin Ko , Byung-Seok Choi , Joong-Seon Choe
CPC分类号： G02B27/283 , G02B27/286 , H04K1/08
摘要： Provided is a polarization decomposition device. The polarization decomposition device includes a polarization beam splitter configured to split an optical signal into a first polarized light having a first polarization direction and a second polarized light having a second polarization direction different from the first polarized light, a phase shifter configured to delay a phase of the first polarized light, a polarization rotator configured to rotate the second polarized light so that the polarization direction of the second polarized light is changed, and an interference beam splitter configured to allow the first polarized light in which the phase is delayed and the second polarized light in which the polarization direction is rotated to interfere with each other and split them into a third polarized light and a fourth polarized light.
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公开(公告)号：US08929731B2
公开(公告)日：2015-01-06
申请号：US13687741
申请日：2012-11-28
发明人： Chun Ju Youn , Joong-Seon Choe , Jong-Hoi Kim , Duk Jun Kim , Yong-Hwan Kwon , Eun Soo Nam
IPC分类号： H04B10/08 , H04B17/00 , H04B10/06 , H04B10/61 , H04B10/079
CPC分类号： H04B10/614 , H04B10/0799
摘要： An apparatus for measuring performance of a coherent optical receiver includes a beam splitter splitting light into first and second paths, a first optical modulator modulating the first path light, a variable optical attenuator controlling an optical power of the first optical modulator, a first polarization controller transmitting a signal controlling polarization of an output of the variable optical attenuator to the coherent optical receiver, a second optical modulator modulating the second path light, a variable optical delay line delaying time of an output of the second optical modulator, a second polarization controller transmitting a signal controlling polarization of an output of the variable optical delay line to the coherent optical receiver, a network analyzer measuring performance of the coherent optical receiver and controlling the optical modulators, and a controller transmitting a control signal to the optical modulators.
摘要翻译： 一种用于测量相干光接收机性能的装置，包括将光分成第一和第二路径的光束分配器，调制第一路径光的第一光调制器，控制第一光调制器的光功率的可变光衰减器，第一偏振控制器 将所述可变光衰减器的输出的偏振信号控制到所述相干光接收器，调制所述第二路径光的第二光调制器，所述第二光调制器的输出的可变光延迟线延迟时间，第二偏振控制器发送 控制可变光延迟线到相干光接收机的输出的偏振的信号，测量相干光接收机的性能并控制光调制器的网络分析仪，以及向光调制器发送控制信号的控制器。
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公开(公告)号：US09893810B2
公开(公告)日：2018-02-13
申请号：US15133945
申请日：2016-04-20
发明人： Seo Young Lee , Young Tak Han , Jong Hoi Kim , Joong Seon Choe , Chun Ju Youn , Hyun Do Jung
IPC分类号： H01L31/0232 , H04B10/25 , G02B6/00
CPC分类号： H04B10/2504 , G02B6/00 , G02B6/4249 , G02B6/4279
摘要： There is provided a receiver optical module including a photodetector having a plurality of channels, a capacitor disposing block formed on an upper portion of the photodetector, a plurality of capacitors formed on the capacitor disposing block, and an electrical wiring configured to connect the plurality of capacitors to electrodes of a plurality of channels of the photodetector, wherein the plurality of capacitors are formed on the capacitor disposing block such that distance between the capacitors and the electrodes of the corresponding channels are the same. Distortion and loss of signal characteristics of high frequency can be reduced and quality of a signal can be enhanced.
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公开(公告)号：US09166680B2
公开(公告)日：2015-10-20
申请号：US14027445
申请日：2013-09-16
发明人： Chun Ju Youn , Jong-Hoi Kim , Joong-Seon Choe , Duk Jun Kim , Yong-Hwan Kwon , Eun Soo Nam
IPC分类号： H04B10/073 , H04B10/61 , H04L27/22 , H04L27/36 , H04L27/00
CPC分类号： H04B10/0731 , H04B10/613 , H04L27/223 , H04L27/364 , H04L2027/0083
摘要： Provided is an apparatus and method for measuring IQ imbalance, and in particular, is an apparatus and method for measuring IQ imbalance for an optical receiver. The apparatus for measuring IQ imbalance for an optical receiver includes a light generating unit generating optical and reference signals to provide the optical and reference signals to an optical receiver, a graph creating unit creating a Lissajous figure by using an in-phase (I) signal and a quadrature-phase (Q) signal output from the optical receiver in response to the optical and reference signals, and a calculating unit calculating IQ imbalance for the optical receiver with reference to the Lissajous figure.
摘要翻译： 提供了一种用于测量IQ不平衡的装置和方法，特别是用于测量光接收机的IQ不平衡的装置和方法。 用于测量光接收机的IQ不平衡的装置包括产生光学和参考信号以向光学接收器提供光学参考信号的光产生单元，通过使用同相（I）信号产生李萨如图的图形创建单元 以及响应于光学参考信号从光学接收器输出的正交相位（Q）信号，以及计算单元，参考利萨如图来计算光学接收机的IQ不平衡。
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公开(公告)号：US11770245B2
公开(公告)日：2023-09-26
申请号：US17488955
申请日：2021-09-29
发明人： Kyongchun Lim , Chun Ju Youn , Byung-seok Choi , Young-Ho Ko , Kap-Joong Kim , Minchul Kim , Ju Hee Baek , Joong-Seon Choe
IPC分类号： H04L9/08
CPC分类号： H04L9/0855 , H04L9/0825 , H04L9/0858
摘要： Disclosed is a quantum key distribution system using an RFI (reference frame independent) QKD (quantum key distribution) protocol, which includes a first signal processing circuit that generates transmission basis information and transmission bit information, a quantum channel transmitter that generates a single photon or coherent light, and modulates the single photon or the coherent light based on the transmission basis information and the transmission bit information to generate a quantum signal, a quantum channel receiver that receives the quantum signal through a quantum channel and detects reception bit information from the quantum signal based on reception basis information, and a second signal processing circuit that generates the reception basis information, transmits the reception basis information to the first signal processing circuit through a public channel, and receives the transmission basis information from the first signal processing circuit through the public channel.
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公开(公告)号：US09710231B2
公开(公告)日：2017-07-18
申请号：US15144771
申请日：2016-05-02
发明人： Chun Ju Youn , Joong Seon Choe , Jong Hoi Kim
CPC分类号： G06F7/588 , G06N99/002 , H04L9/0852
摘要： A multiple output quantum random number generator coherently measures an optical source noise and outputs a random number sequence based on the independent and coherent measurement of optical source noise. Therefore, it is possible to output a random number sequence at a high speed and to perform multiple outputs.
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公开(公告)号：US20240168307A1
公开(公告)日：2024-05-23
申请号：US18516066
申请日：2023-11-21
发明人： Kap Joong KIM , Chun Ju Youn , Young-Ho Ko , Minchul Kim , Seong Su Park , Kyongchun Lim , Byung-seok Choi , Joong-Seon Choe , Won Seok Han
IPC分类号： G02B27/28
CPC分类号： G02B27/283 , G02B27/286
摘要： Disclosed is a polarized light generating device based on an optical waveguide, which includes first to fourth input optical waveguides, respectively, for receiving input light from an outside, first to fifth optical splitters configured to receive at least one light and output the received at least one light as at least one light, and an optical converter configured to receive at least one light from the fifth optical splitter and convert the received light to generate polarized light. The polarized light generating device receives the input light through one of the first to fourth input optical waveguides, and generates a first polarized light, a second polarized light, a third polarized light, and a fourth polarized light. The first to fourth polarized lights belong to elements of two arbitrary two-dimensional mutually unbiased basis sets.
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公开(公告)号：US11522618B2
公开(公告)日：2022-12-06
申请号：US17203186
申请日：2021-03-16
发明人： Kyongchun Lim , Chun Ju Youn , Young-Ho Ko , Kap Joong Kim , Minchul Kim , Byung-seok Choi , Joong-Seon Choe
摘要： Disclosed are a quantum information transmitter, a quantum communication system including the same, and an operating method of the quantum information transmitter. The quantum information transmitter includes a light source driver, a light source, and a light modulator. The light source driver generates a first light source driving signal having a first level and a second light source driving signal having a second level. The light source generates a first light signal having a first average number of photons in response to the first light source driving signal, and generates a second light signal having a second average number of photons in response to the second light source driving signal. The optical modulator modulates the first light signal to generate a target signal, and modulates the second light signal to generate a decoy signal.
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公开(公告)号：US20190162986A1
公开(公告)日：2019-05-30
申请号：US16184495
申请日：2018-11-08
发明人： Joong-Seon Choe , Chun Ju Youn , Heasin Ko , Kap-Joong Kim , Byung-seok Choi
摘要： Provided is an apparatus configured to split light into a plurality of polarizations, the apparatus including an input waveguide configured to receive the light, a first interferometer configured to split the light into a first polarization and a second polarization, and a second interferometer configured to split the light into a third polarization and a fourth polarization, wherein the first interferometer and the second interferometer are connected in parallel, the first interferometer comprises a first output waveguide configured to output the first polarization, and a second output waveguide configured to output the second polarization, and the second interferometer comprises a third output waveguide configured to output the third polarization, and a fourth output waveguide configured to output the fourth polarization.
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10.发明授权公开(公告)号：US09031421B2
公开(公告)日：2015-05-12
申请号：US13934589
申请日：2013-07-03
发明人： Joong-Seon Choe , Chun Ju Youn , Jong-Hoi Kim , Duk Jun Kim , Yong-Hwan Kwon , Kwang-Seong Choi , Eun Soo Nam
IPC分类号： H04B10/06 , H04B10/077
CPC分类号： H04B10/0779
摘要： Provided is a method of measuring signal transmission time difference of a measuring device. The measuring device according to embodiments, by measuring a skew on two optical paths through signal delays of sufficient sizes for skew measurement on the optical paths, even a skew having a minute size can be measured within a measurable range.
摘要翻译： 提供了测量装置的信号传输时间差的测量方法。 根据实施例的测量装置可以在可测量的范围内测量通过在光路上经过足够尺寸的信号延迟的信号延迟测量两个光路上的偏斜测量，甚至具有微小尺寸的偏斜。
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