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公开(公告)号：US20220123837A1
公开(公告)日：2022-04-21
申请号：US17367944
申请日：2021-07-06
Inventor： Kwang Ok KIM , Kyeong Hwan DOO , Jung-yeol OH , Han Hyub LEE , Hwan Seok CHUNG
IPC: H04B10/27
Abstract: Disclosed is a method of registering a new optical network unit (ONU) to be performed by an optical line terminal (OLT). The method includes transmitting a ranging notification message to a centralized unit (CU)/distributed unit (DU) to register the new ONU, receiving scheduling information for registering the new ONU from the CU/DU in response to the ranging notification message, transmitting a serial number request message to a service region in which ONUs are present based on the received scheduling information, and when the serial number response message is received from the new ONU in response to the serial number request message, registering the new ONU that transmits a serial number request message. The transmitting of the serial number request message is performed through a multi-quiet zone of a short period.
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公开(公告)号：US20200014992A1
公开(公告)日：2020-01-09
申请号：US16503766
申请日：2019-07-05
Inventor： Hwan Seok CHUNG , Kyeong Hwan DOO , Han Hyub LEE , Kwang Ok KIM
Abstract: A cooperative dynamic bandwidth allocation (CO-DBA) method in a structure in which a mobile network and an optical access network are combined allows the mobile network and the optical access network to share mobile scheduling information in advance and allocate bandwidths in advance, and thus prevent a latency in upstream transmission of mobile traffic.
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13.发明申请公开(公告)号：US20180152244A1
公开(公告)日：2018-05-31
申请号：US15823823
申请日：2017-11-28
Inventor： Seung-Hyun CHO , Hwan Seok CHUNG , Minkyu SUNG , Jong Hyun LEE
IPC: H04B10/2575 , H04J14/02
CPC classification number: H04B10/25753 , H04B1/38 , H04B2210/006 , H04J14/02
Abstract: A host unit is provided between a remote radio head and a radio unit. The host unit performs a conversion between a digital optical signal used by the remote radio head and an analog optical signal used by the radio unit. A frequency of the analog optical signal converted by the host unit may be an intermediate frequency. The radio unit performs a conversion between an analog optical signal used by the host unit and an analog radio signal used by a user terminal. A frequency of the analog radio signal may be included in a millimeter wave band or radio frequency band.
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公开(公告)号：US20180062762A1
公开(公告)日：2018-03-01
申请号：US15685452
申请日：2017-08-24
Inventor： Sil Gu MUN , Hwan Seok CHUNG
IPC: H04B10/69
CPC classification number: H04B10/69 , H04B10/6933
Abstract: An optical signal receiving apparatus included in an optical line terminal (OLT) includes a resistor disposed between a capacitor connected to a receiving optical sub-assembly (ROSA) and a limiting amplifier, wherein a resistance value of the resistor may be determined based on the OLT receives an optical signal from an optical network unit (ONU) and whether the ONU transmitting the optical signal to the OLT is switched, the resistance value of the resistor may be determined to reduce a data loss occurring from the optical signal receiving apparatus in response to the OLT receiving the optical signal from the ONU, and the resistance value of the resistor may be determined such that the optical signal receiving apparatus more rapidly follows a change in intensity of the optical signal in response to the ONU transmitting the optical signal to the OLT being switched.
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公开(公告)号：US20170293076A1
公开(公告)日：2017-10-12
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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Patent Agency Ranking
公开(公告)号：US20170086300A1
公开(公告)日：2017-03-23
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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17.发明申请公开(公告)号：US20250007614A1
公开(公告)日：2025-01-02
申请号：US18757716
申请日：2024-06-28
Inventor： Han Hyub LEE , Hwan Seok CHUNG
Abstract: Proposed is an operation method of an optical transceiver. The operation method includes determining a first center wavelength for a downstream optical signal, determining a second center wavelength for an upstream optical signal, allocating the first center wavelength to a downstream optical signal, allocating the second center wavelength to an upstream optical signal, wherein the first center wavelength and the second center wavelength has a separation distance corresponding to a predetermined wavelength spacing therebetween, and separating the downstream optical signal and the upstream optical signal on the basis of the separation distance.
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公开(公告)号：US20240196119A1
公开(公告)日：2024-06-13
申请号：US18231860
申请日：2023-08-09
Inventor： Kwang Ok KIM , Kyeong Hwan DOO , Hwan Seok CHUNG
CPC classification number: H04Q11/0067 , H04L1/0076 , H04Q2011/0081 , H04Q2011/0083 , H04Q2011/0086
Abstract: A rogue ONU detection and recovery method in a PON network includes steps of: monitoring upstream signals transmitted from a plurality of ONUs to an OLT to acquire LOS signal information and FEC error information; sensing an operation of the rogue ONU in the PON network on the basis of the LOS signal information and the FEC error information; and deactivating at least one of the plurality of ONUs and recovering the rogue ONU to a normal ONU according to whether or not the operation of the rogue ONU is released.
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公开(公告)号：US20230144071A1
公开(公告)日：2023-05-11
申请号：US17871176
申请日：2022-07-22
Inventor： Han Hyub LEE , Hwan Seok CHUNG
IPC: H04B10/508 , H04B10/40 , H04B10/50 , H04B10/69
CPC classification number: H04B10/508 , H04B10/40 , H04B10/504 , H04B10/697
Abstract: Provided is a burst mode optical transmitter capable of preventing an optical signal from being output from a light source during burst mode disable time through an arithmetic circuit configured to remove an idle signal included in a MAC electrical signal by using a MAC electrical signal and a burst mode control signal.
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公开(公告)号：US20190305871A1
公开(公告)日：2019-10-03
申请号：US16203665
申请日：2018-11-29
Inventor： Han Hyub LEE , Hwan Seok CHUNG
Abstract: An optical network unit (ONU) for optical transmission in a burst mode includes an electro-absorption modulated laser (EML) transmitter including a laser diode (LD) and configured to transmit an uplink optical signal through the LD, an electro-absorption modulator (EAM) driver integrated circuit (IC) (EAM driver IC) configured to amplify an uplink data signal and provide the amplified data signal to the EML transmitter, an LD burst-mode driving circuit configured to control an operation of turning on or off the LD based on a burst-enable signal, and a media access control (MAC) configured to transmit the data signal to the EAM driver IC and transmit the burst-enable signal to the LD burst-mode driving circuit.
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