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公开(公告)号：US12177045B2
公开(公告)日：2024-12-24
申请号：US18126137
申请日：2023-03-24
Inventor： Seung-Woo Lee , Sang Rok Moon , Joon Ki Lee
IPC: H04L25/03 , H04L25/497
Abstract: A method of equalization for high-speed processing and an equalizer thereof are proposed. The method of equalization includes determining a filter coefficient applied to a transmitter equalizer provided with a 2-tap precoder according to an approximate channel response characteristic, generating a pre-equalization signal by removing precursor ISI of a transmission feedback signal by the precoder to which the filter coefficient is applied, so as to output the pre-equalization signal as a transmitting signal, and receiving a transmission signal and generating an equalization signal by removing postcursor ISI of the received transmission signal by a receiver equalizer provided with a feedback filter having auxiliary coefficients for compensating for a difference between an overall channel response of the transmission signal and a channel response based on the precoder.
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公开(公告)号：US12176950B2
公开(公告)日：2024-12-24
申请号：US18389942
申请日：2023-12-20
Inventor： Seung-Hyun Cho , Joon Ki Lee
IPC: H04B10/07 , H04B10/077 , H04B10/2575
Abstract: A test device and method for testing a distributed feedback laser diode (DFB-LD) device for an optical transceiver of a radio over fiber (RoF) system examines the DFB-LD device based on an absolute limiting rating, an operating case environment, and a functional specification, in which the absolute limiting rating is a rating at which there is no fatal damage to the DFB-LD device during a short period of time when each limiting parameter is isolated and all other parameters are in a normal performance parameter, the operating case environment includes an operating temperature, and the functional specification includes parameters to be tested according to an operating condition for the functional specification.
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公开(公告)号：US11996890B2
公开(公告)日：2024-05-28
申请号：US17845190
申请日：2022-06-21
Inventor： Seung-Hyun Cho , Joon Ki Lee
IPC: H04B10/2575 , H04L7/04 , H04W88/08
CPC classification number: H04B10/25753 , H04L7/04 , H04W88/085
Abstract: Provided is a radio over fiber (RoF)-based distributed antenna system (DAS) structure that cost-effectively provides a fifth generation (5G) mobile communication service guaranteeing a quality of service (QoS) with high bandwidth and low latency characteristics without radio shadowing in an indoor environment.
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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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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：US12092873B2
公开(公告)日：2024-09-17
申请号：US17587194
申请日：2022-01-28
Inventor： Sae-Kyoung Kang , Joon Young Huh , Joon Ki Lee
IPC: G02B6/30
CPC classification number: G02B6/30
Abstract: An optical fiber coupler includes a plurality of optical fibers parallel to each other in a first direction, an optical fiber array block (FAB) configured to maintain a constant center-to-center distance between the plurality of optical fibers, and an optical waveguide block including a plurality of optical waveguides coupled to the plurality of optical fibers, respectively, and configured to transfer optical signals transmitted through the plurality of optical fibers connected to the optical FAB in a second direction in which a photonics chip is placed and which is different from the first direction.
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公开(公告)号：US12056528B2
公开(公告)日：2024-08-06
申请号：US17221086
申请日：2021-04-02
Inventor： Daeub Kim , Jongtae Song , Ji Wook Youn , Joon Ki Lee , Kyeong-Eun Han
IPC: G06F9/50
CPC classification number: G06F9/5027
Abstract: A system for cooperation of disaggregated computing resources interconnected through an optical circuit, and a method for cooperation of disaggregated resources are disclosed. Functional block devices such as a processor block, an accelerator block, and a memory fabric block exist at a remote location, and these three types of remote functional block devices are interconnected and interoperated in a specific program to perform a cooperative computation and processing process. Accordingly, the system shares data and information of a memory existing in each block through optical signal interconnection that provides low-latency, fast processing, and wide bandwidth, and maintains cooperation and memory coherency.
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公开(公告)号：US10805224B2
公开(公告)日：2020-10-13
申请号：US16122200
申请日：2018-09-05
Inventor： Kyeong Eun Han , Dae Ub Kim , Chan Sung Park , Jong Tae Song , Kwang Joon Kim , Joon Ki Lee
IPC: H04L12/863 , H04L12/841 , H04L12/935
Abstract: A parallel scheduling apparatus includes an information managing unit generating a first request information for scheduling, a first scheduling unit performing first scheduling and then generating first matching information on the basis of the first request information, and a second scheduling unit performing second scheduling on the basis of the first request information and the first matching information. The parallel scheduling has an advantage of improving the scheduling performance and lowering the implementation complexity, ensuring low delay and transmission fairness among VOQs at low input traffic, being applied to all scheduling algorithms that perform existing multi-iterations, and providing efficient scheduling in a packet switch having a long RTT time or having a very short time slot or cell size, such as an optical switch.
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公开(公告)号：US10110338B2
公开(公告)日：2018-10-23
申请号：US15625430
申请日：2017-06-16
Inventor： Sae-Kyoung Kang , Joon Young Huh , Joon Ki Lee , Jie Hyun Lee
Abstract: An optical signal detecting apparatus and method. The optical signal detecting apparatus includes an optical demultiplexer configured to demultiplex an input optical signal into a first optical signal having a first band wavelength and a second optical signal having a second band wavelength, a first optical detector configured to detect the first optical signal, and a second optical detector configured to detect the second optical signal, and the optical demultiplexer, the first optical detector, and the second optical detector may be provided in a TO-CAN package.
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