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公开(公告)号：US20230068004A1
公开(公告)日：2023-03-02
申请号：US17545063
申请日：2021-12-08
Inventor： Sanghwa YOO , Sooyeon KIM , Heuk PARK , Jyung Chan LEE , Joon Ki LEE
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：US20210141157A1
公开(公告)日：2021-05-13
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：US20230358955A1
公开(公告)日：2023-11-09
申请号：US18142752
申请日：2023-05-03
Inventor： Sanghwa YOO , Heuk PARK , Joon Ki LEE
CPC classification number: G02B6/1225 , G02B6/12004 , G02B6/12002 , G02B2006/12061 , G02B2006/12142
Abstract: According one embodiment of the present disclosure, there is provided a silicon photonics-based optical modulation device having two metal layers. The optical modulation device includes a phase shifter, a ground unit, and a pad unit. The phase shifter includes a first signal electrode, a second signal electrode, and at least two ground electrodes formed in a first metal layer. The phase shifter includes two silicon optical waveguides. The ground unit is formed in a second metal layer different from the first metal layer. The pad unit is formed in the second metal layer, provided with a first local area electrically connected to the ground unit, and electrically connected to the first signal electrode and the second signal electrode via a second local area thereof electrically isolated from the ground unit.
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公开(公告)号：US20220091332A1
公开(公告)日：2022-03-24
申请号：US17371520
申请日：2021-07-09
Inventor： Sanghwa YOO , Heuk PARK , Jyung Chan LEE , Joon Ki LEE
Abstract: Disclosed is a silicon photonics-based electronic-photonic integrated circuit (EPIC). The silicon photonics-based EPIC includes a silicon photonic integrated circuit (PIC) chip in which an optical device is mounted on a silicon-on-insulator (SOI) wafer including a trench region, an electronic integrated circuit (EIC) chip mounted in the trench region of the PIC chip, and an electrical interface configured to connect an electrode pad of the PIC chip and an electrode pad of the EIC chip.
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公开(公告)号：US20220308285A1
公开(公告)日：2022-09-29
申请号：US17540439
申请日：2021-12-02
Inventor： Dongjun SEO , Heuk PARK , Sanghwa YOO , Joon Ki LEE
IPC: G02B6/12 , H01L31/0232 , H01L31/028 , H01L31/105
Abstract: A silicon photonics-based photodetector (PD) includes a silicon layer on which doped layers of different types are formed on a surface based on a first spacing based on a center line of an optical waveguide through which an optical signal moves, a germanium layer being stacked on an upper part of the silicon layer and formed with doped layers of different types on a surface based on a second spacing based on the center line of the optical waveguide, and a metal electrode configured to generate an electric field by being in contact with the doped layers of the silicon layer and the germanium layer.
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Patent Agency Ranking
公开(公告)号：US20220137477A1
公开(公告)日：2022-05-05
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：US20210297158A1
公开(公告)日：2021-09-23
申请号：US17204341
申请日：2021-03-17
Inventor： Joon Young HUH , Sae-Kyoung KANG , Sanghwa YOO
Abstract: A bidirectional optical transceiver module includes an optical Tx block including a light source configured to output an optical Tx signal; an optical Rx block provided in parallel to the optical Tx block and including a PD configured to receive an optical Rx signal; a wavelength distributor configured to change a travel path of the optical Tx signal; an optical filter provided on a predetermined area of a first surface of the wavelength distributor adjacent to the optical Tx or Rx block and configured to transmit the optical Rx signal and reflect the optical Tx signal; a first lens provided between the optical Tx block and the wavelength distributor; a second lens provided between the optical Rx block and the wavelength distributor; and a third lens configured to output the optical Tx signal to outside and output the optical Rx signal from the outside to the wavelength distributor.
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公开(公告)号：US20220360339A1
公开(公告)日：2022-11-10
申请号：US17545075
申请日：2021-12-08
Inventor： Sanghwa YOO , Joon Young HUH , Sae-Kyoung KANG , Joon Ki LEE
IPC: H04B10/564 , H04J14/08 , H04B10/54 , H04L7/00
Abstract: An optical transmitter based on optical time division multiplexing is disclosed, which may solve the issues of complex structure and operation of a multilevel-OTDM-based optical transmitter while using a multilevel signal modulation format and OTDM technology that may increase the transmission rate of an optical transmitter with limited bandwidth.
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公开(公告)号：US20210072614A1
公开(公告)日：2021-03-11
申请号：US16889086
申请日：2020-06-01
Inventor： Sanghwa YOO , Joon Ki LEE
IPC: G02F1/225
Abstract: A silicon-based optical modulator. An optical modulator of a Mach-Zehnder type includes an optical coupler configured to separate a single optical signal into two optical signals having same output power, two phase shifters having a PN junction through which the two optical signals separated through the optical coupler pass respectively, a plurality of electrodes configured to apply an electrical signal to the two phase shifters, and two PN diodes disposed between the two phase shifters and configured to adjust an operating bandwidth of the optical modulator. The optical signals respectively passing through the two phase shifters have phases that change as a width of a depletion region changes based on a magnitude of a reverse voltage provided to the two phase shifters through the electrodes and a refractive index changes.
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公开(公告)号：US20180139519A1
公开(公告)日：2018-05-17
申请号：US15469670
申请日：2017-03-27
Inventor： Sanghwa YOO , Joon Ki LEE
CPC classification number: H04Q11/0005 , H04B10/54 , H04B10/564 , H04Q2011/0018 , H04Q2011/0024
Abstract: An optical transmitter includes an optical modulator configured to modulate an optical signal, a dual-stage space switch configured to receive, as an input, the modulated optical signal from the optical modulator, and output ports configured to control light outputs based on an operation of the dual-stage space switch.
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