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公开(公告)号：US11409047B2
公开(公告)日：2022-08-09
申请号：US17094465
申请日：2020-11-10
Inventor： Sanghwa Yoo , Sae-Kyoung Kang , Heuk Park , Joon Young Huh , Jongtae Song , Joon Ki Lee
Abstract: An optical coupling method and apparatus are disclosed. The optical coupling method improve the speed of optical alignment between an optical fiber and a grating coupler (GC) of an optical coupling apparatus for a characteristic test of a silicon photonic integrated circuit (Si-PIC) chip by using a reflective grating couplers disposed on the Si-PIC chip.
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公开(公告)号：US11899334B2
公开(公告)日：2024-02-13
申请号：US17545063
申请日：2021-12-08
Inventor： Sanghwa Yoo , Sooyeon Kim , Heuk Park , Jyung Chan Lee , Joon Ki Lee
CPC classification number: G02F1/2257 , G02F1/0123 , G02F2202/105
Abstract: A silicon photonics-based optical modulator is disclosed. The optical modulator includes first radio frequency (RF) metal electrodes that operate as a ground, phase shifters disposed between the first RF metal electrodes for optically modulating an optical signal transmitted along an optical waveguide, second RF metal electrodes disposed between the phase shifters for providing an RF electrical signal received from a driving driver located outside of the optical modulator through one end, resistor-inductors (RL) connected to another end of the second RF metal electrodes, an inductive line disposed between the RLs and a power supply for applying a bias voltage to the optical modulator and the driving driver, and a silicon capacitor disposed between the RLs and the power supply for preventing a degradation of an RF response characteristic of the silicon photonics-based optical modulator caused by the inductive line.
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公开(公告)号：US11429006B2
公开(公告)日：2022-08-30
申请号：US17377658
申请日：2021-07-16
Inventor： Sanghwa Yoo , Heuk Park , Joon Ki Lee
Abstract: Disclosed is a silicon photonics-based optical transmission apparatus. The apparatus includes an optical modulator chip of a ground-signal-ground (GSG) electrode array including two phase shifters for differential driving, a sub-substrate including a metal electrode of a periodic pattern to connect two ground metal electrodes to each other at a GSG electrode connected to each of the two phase shifters, and a solder bump having a same periodic pattern as the metal electrode of the sub-substrate to connect the ground metal electrodes of the optical modulator chip and the metal electrode of the periodic pattern of the sub-substrate.
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公开(公告)号：US09804327B1
公开(公告)日：2017-10-31
申请号：US15466405
申请日：2017-03-22
Inventor： Heuk Park , Sae Kyoung Kang , Hwan Seok Chung
CPC classification number: G02B6/12011 , G02B6/12016 , H04J14/02
Abstract: Provided is a phase error compensating apparatus. The phase error compensating apparatus may include a waveguide array disposed between a first free propagation region and a second free propagation region and configured to allow a light signal passed through the first free propagation region to move toward the second free propagation region, in which a length of each of the waveguides included in the waveguide array may be adjusted to compensate for a phase error of light signals passed through the waveguides.
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公开(公告)号：US09720170B2
公开(公告)日：2017-08-01
申请号：US15081289
申请日：2016-03-25
Inventor： Heuk Park , Sang Soo Lee
CPC classification number: G02B6/12033 , G02B6/12007 , G02B6/12009 , G02B6/12011
Abstract: An arrayed waveguide grating device and a method for manufacturing the arrayed waveguide grating device. The arrayed waveguide grating device includes input channel waveguides formed on a substrate; output channel waveguides formed on the substrate that correspond to the input channel waveguides; and arrayed waveguides with different lengths interposed between the input channel waveguides and the output channel waveguides on the substrate while free propagation regions being formed at both ends of the arrayed waveguides, wherein the arrayed waveguides are designed so that a free spectral range (FSR) of a higher-order mode is twice or greater than a bandwidth of a region of interest (ROI).
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Patent Agency Ranking
6.发明授权公开(公告)号：US11609474B2
公开(公告)日：2023-03-21
申请号：US17496684
申请日：2021-10-07
Inventor： Won Kyoung Lee , Heuk Park , Seung-Hyun Cho
IPC: G02F1/21 , G02F1/225 , H04B10/516 , H04B10/114
Abstract: Disclosed are a terahertz signal generation apparatus and a terahertz signal generation method using the same. The terahertz signal generation apparatus includes first and second resonators configured to respectively output an optical signal of a first resonant frequency and an optical signal of a second resonant frequency from an optical signal input through a gain medium, an optical modulator configured to optically modulate the output optical signal of the second resonant frequency, an optical combiner configured to combine the CW optical signal of the first resonant frequency and the modulated optical signal of the second resonant frequency, and a signal generator configured to generate a terahertz signal using heterodyne beating between the CW optical signal of the first resonant frequency and the modulated optical signal of the second resonant frequency, wherein the first resonant frequency and the second resonant frequency are processed to have a predetermined frequency difference.
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公开(公告)号：US10003427B1
公开(公告)日：2018-06-19
申请号：US15640696
申请日：2017-07-03
Inventor： Heuk Park , Hwan Seok Chung
IPC: H04J14/02 , H04B10/275 , G02B6/293
CPC classification number: H04J14/0216 , G02B6/29338 , G02B6/29343 , G02B6/29383 , H04B10/275 , H04J14/0202 , H04J14/0204
Abstract: A bidirectional optical element in optical network units (ONUs) of a passive optical network (PON) includes a main filter configured to pass an upstream signal having an upstream-channel wavelength and a downstream signal having a downstream-channel wavelength, a drop filter configured to pass the downstream signal having the downstream-channel wavelength and reject the upstream signal having the upstream-channel wavelength, and an add filter configured to pass the upstream signal having the upstream-channel wavelength and reject the downstream signal having the downstream-channel wavelength, wherein the main filter, the drop filter, and the add filter are configured to share a single optical waveguide, and the optical waveguide is configured to connect input ports of the main filter and the drop filter and an output port of the drop filter and is provided in a straight line shape.
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公开(公告)号：US10476625B2
公开(公告)日：2019-11-12
申请号：US15798807
申请日：2017-10-31
Inventor： Han Hyub Lee , Heuk Park , Hwan Seok Chung
IPC: H04J14/02 , H04B10/572 , H04B10/27 , H04J14/08
Abstract: Wavelength channels used in the optical network system are classified into downstream channels used to transmit optical signals from an optical line terminal (OLT) to an optical network unit (ONU) and upstream channels that are used to transmit optical signals from the ONU to the OLT. The wavelength channels are included in an O-band and may not overlap each other. One of the upstream channels are allocated to a wavelength band (for example, a zero-dispersion window) in which a four-wave mixing occurs. A wavelength spacing between the upstream channels and the downstream channels is determined based on a performance of separating the upstream channels and the downstream channels in a bidirectional optical sub assembly (BOSA) of the ONU. Also, a wavelength spacing between the downstream channels is determined based on a performance of separating the downstream channels in the BOSA.
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公开(公告)号：US09900991B2
公开(公告)日：2018-02-20
申请号：US15263498
申请日：2016-09-13
Inventor： Sae Kyoung Kang , Heuk Park , Hwan Seok Chung
CPC classification number: H05K1/189 , H05K1/025 , H05K1/116 , H05K3/28 , H05K3/3447 , H05K2201/10121
Abstract: A flexible printed circuit board (FPCB) for an optical module includes: a signal via pad connected with a signal lead pin of the optical module; a ground layer spaced apart from the signal via pad; an isolation gap formed between the signal via pad and the ground layer; and a protective layer which is formed at a portion that comprises the isolation gap, and which, when connected with the signal via pad, compensates for parasitic inductance caused by a protruding signal lead pin.
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10.发明授权Tunable optical network unit for multi-wavelength passive optical network system and operating method thereof 有权用于多波长无源光网络系统的可调光网络单元及其操作方法公开(公告)号：US09397778B2
公开(公告)日：2016-07-19
申请号：US14694224
申请日：2015-04-23
Inventor： Jie Hyun Lee , Heuk Park , Jyung Chan Lee , Sang Soo Lee
CPC classification number: H04J14/0278 , H04B10/272 , H04J14/023 , H04J14/0241
Abstract: A tunable optical network unit (ONU) for a multi-wavelength passive optical network (MW PON) system and an operation method thereof are provided. The tunable ONU includes a cyclic tunable filter configured to have cyclic wavelength transmission properties that allow all wavelength channels of both a downstream signal and an upstream signal and to vary a wavelength to pass therethrough; a wavelength splitter configured to split an upstream signal wavelength band and a downstream signal wavelength band; a photodetector element configured to detect a downstream signal that is transmitted through the wavelength splitter, passing through the cyclic tunable filter which is aligned to a specific downstream signal wavelength channel; and a tunable transmitter configured to output to the wavelength transmitter an upstream signal of a wavelength channel that is determined based on an aligned downstream signal wavelength channel of the cyclic tunable filter.
Abstract translation: 提供了一种用于多波长无源光网络（MW PON）系统的可调谐光网络单元（ONU）及其操作方法。 可调谐ONU包括循环可调滤波器，其被配置为具有允许下行信号和上行信号的所有波长信道并且使波长变化通过的循环波长传输特性; 波长分离器，被配置为分离上游信号波长带和下游信号波长带; 光检测器元件，被配置为检测通过波长分离器传输的下行信号，通过与特定下行信号波长信道对准的循环可调滤波器; 以及可调谐发射器，被配置为向所述波长发射器输出基于所述循环可调滤波器的对准的下行信号波长信道确定的波长信道的上行信号。
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