-
公开(公告)号：US09998222B2
公开(公告)日：2018-06-12
申请号：US15245315
申请日：2016-08-24
Inventor： Chan Gyo Han , Min Kyu Sung , Jong Hyun Lee , Hwan Seok Chung , Seung Hyun Cho
IPC: H04B10/2513 , H04J1/02 , H04J14/02
CPC classification number: H04B10/2513 , H04B10/25753 , H04B10/548 , H04J1/02 , H04J14/0227
Abstract: An optical signal transmission system and method of allocating center frequencies of intermediate frequency (IF) carriers in a frequency division multiplexing (FDM) optical fiber link. The optical signal transmission method includes determining a center frequency interval between modulated signals based on a bandwidth of the modulated signals or a center frequency of a modulated signal having a lowest center frequency, among the modulated signals, reallocating center frequencies to the modulated signals based on the center frequency interval between the modulated signals, and converting the modulated signals reallocated the center frequencies from electrical signal into optical signal and transmitting the optical signal.
-
公开(公告)号：US11799552B2
公开(公告)日：2023-10-24
申请号：US17394735
申请日：2021-08-05
Inventor： Han Hyub Lee , Hwan Seok Chung
IPC: H04B10/50 , H04B10/079 , H04B10/69 , H04L1/00 , H01S5/06
CPC classification number: H04B10/50 , H04B10/07955 , H04B10/69 , H01S5/0617 , H01S2301/02 , H04L1/0061
Abstract: An optical network using an optical amplifier in a gain saturation region includes an optical transmission apparatus. The optical transmission apparatus includes an optical transmitter configured to output an optical signal, a semiconductor optical amplifier (SOA) configured to amplify the optical signal outputted through the optical transmitter, and a controller configured to control the SOA to operate in a gain saturation region or a linear gain region depending on whether a forward error correction (FEC) function is used in the optical network.
-
公开(公告)号：US11569911B2
公开(公告)日：2023-01-31
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.
-
Patent Agency Ranking
公开(公告)号：US10827240B2
公开(公告)日：2020-11-03
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.
-
公开(公告)号：US10090928B2
公开(公告)日：2018-10-02
申请号：US15378194
申请日：2016-12-14
Inventor： Min Kyu Sung , Jong Hyun Lee , Hwan Seok Chung , Seung Hyun Cho , Chan Gyo Han
IPC: H04B10/00 , H04B10/2513 , H04B10/2575
Abstract: Provided is an analog optical transmission system using a dispersion management technique. The analog optical transmission system may include a digital unit (DU) pool including a plurality of DUs to transmit an optical signal; a plurality of radio units (RUs) to receive the optical signal; and one or more dispersion management apparatus to remove a signal distortion component caused by an interaction between a chirp and chromatic dispersion by compensating for the chromatic dispersion before the plurality of RUs receives the optical signal that is transmitted from the DU pool.
-
公开(公告)号：US10027415B2
公开(公告)日：2018-07-17
申请号：US15079714
申请日：2016-03-24
Inventor： Seung Hyun Cho , Jong Hyun Lee , Hwan Seok Chung , Chan Gyo Han
IPC: H04B10/25 , H04B10/2575
CPC classification number: H04B10/25753 , H04B10/25759
Abstract: An apparatus for transmitting a control signal in a radio-over-fiber (RoF)-based mobile fronthaul includes: a data channel transmitter configured to generate a data signal at a preassigned frequency or wavelength; a control channel transmitter configured to generate a control signal at a designated frequency or wavelength that is shared with other apparatuses; and a combiner configured to combine the data signal with the control signal.
-
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.
-
公开(公告)号：US09787395B2
公开(公告)日：2017-10-10
申请号：US15007739
申请日：2016-01-27
Inventor： Hwan Seok Chung , Seung Hyun Cho , Jong Hyun Lee , Sang Soo Lee , Chan Gyo Han
IPC: H04B10/079 , H04B10/2575 , H04B10/50 , H04B10/564
CPC classification number: H04B10/07953 , H04B10/25759 , H04B10/50572 , H04B10/50575 , H04B10/564
Abstract: An optical fiber cable of a mobile fronthaul system based on a radio over fiber (RoF), which includes a control apparatus for monitoring an analog optical link according to an exemplary embodiment, may be monitored. The monitoring control apparatus may include an optical signal monitor to monitor an optical signal passing through an optical fiber cable, and a system controller to control the optical signal based on a result of the monitoring. The optical signal monitor may calculate an average optical power, carrier-to-noise ratio (CNR), and a size of a nonlinear component from an electrical signal, which has been acquired from the optical signal. Then, the optical signal monitor may control the calculated average optical power, CNR, and nonlinear component.
-
-
-
-
-
-
-
Search Results
28
records
(took 0.025 seconds)
