公开(公告)号：US20170244486A1

公开(公告)日：2017-08-24

申请号：US15245315

申请日：2016-08-24

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Chan Gyo HAN ,  Min Kyu SUNG ,  Jong Hyun LEE ,  Hwan Seok CHUNG ,  Seung Hyun CHO

IPC: H04B10/2513

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：US20160282560A1

公开(公告)日：2016-09-29

申请号：US15081267

申请日：2016-03-25

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Joon Young HUH ,  Sun Hyok CHANG ,  Hwan Seok CHUNG

IPC: G02B6/293 ,  H04L25/14

CPC classification number: G02B6/2938 ,  G02B6/29316 ,  G02B6/29386 ,  H04J14/02

Abstract: An optical demultiplexing apparatus and method for multi-carrier distribution are provided. The optical demultiplexing apparatus may include a demultiplexer and a carrier distributor. The optical demultiplexing apparatus and method allow efficient demultiplexing of a multi-carrier light source by using a single demultiplexer even when a carrier spacing of the light source varies.

Abstract translation: 提供了一种用于多载波分配的光解复用装置和方法。 光解复用装置可以包括解复用器和载波分配器。 光解复用装置和方法即使当光源的载波间隔变化时，也可以通过使用单个解复用器来高效地解复用多载波光源。

公开(公告)号：US20150372755A1

公开(公告)日：2015-12-24

申请号：US14742036

申请日：2015-06-17

Applicant: Electronics and Telecommunications Research Institute

Inventor： Hwan Seok CHUNG ,  Sun Hyok CHANG

IPC: H04B10/2513 ,  H04B10/2569 ,  H04B10/67 ,  G02F1/21 ,  H04B10/556

CPC classification number: H04B10/25133 ,  G02F1/21 ,  G02F1/225 ,  H04B10/2569 ,  H04B10/506 ,  H04B10/5561 ,  H04B10/677

Abstract: An optical transmitting apparatus based on multicarrier differential phase shift keying. The optical transmitting may include a multicarrier generator to output two or more optical signals, each of which has a different wavelength; two or more optical modulators to receive the two or more optical signals, respectively, which have been output from the multicarrier generator, wherein each of the two or more optical modulators modulates phases of the two or more received optical signals by electrical signals that are applied in pairs.

Abstract translation: 一种基于多载波差分相移键控的光发射装置。 光发射可以包括多载波发生器，以输出两个或更多个光信号，每个光信号具有不同的波长; 两个或多个光调制器分别接收从多载波发生器输出的两个或多个光信号，其中两个或多个光调制器中的每一个调制器通过施加的电信号调制两个或多个接收到的光信号的相位 成对。

公开(公告)号：US20140294333A1

公开(公告)日：2014-10-02

申请号：US14090707

申请日：2013-11-26

Applicant: Electronics and Telecommunications Research Institute

Inventor： Sun Hyok CHANG ,  Hwan Seok CHUNG

IPC: G02F1/01

CPC classification number: G02F1/0136

Abstract: A polarization control device in accordance with an exemplary embodiment of the present invention may include a first polarization converter for converting a polarization angle of an input optical signal in response to first control voltages, a second polarization converter for converting a polarization angle of an input optical signal in response to second control voltages, and a third polarization converter for converting an optical signal received from the first polarization converter or the second polarization converter into a first output optical signal having a linear polarization state and outputting the first output optical signal.

Abstract translation: 根据本发明的示例性实施例的偏振控制装置可以包括用于响应于第一控制电压转换输入光信号的偏振角的第一偏振转换器，用于转换输入光学器件的偏振角的第二偏振转换器 响应于第二控制电压的信号;以及第三偏振转换器，用于将从第一偏振转换器或第二偏振转换器接收的光信号转换为具有线性偏振状态的第一输出光信号并输出​​第一输出光信号。

公开(公告)号：US20230163861A1

公开(公告)日：2023-05-25

申请号：US17860219

申请日：2022-07-08

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Kwang Ok KIM ,  Kyeong Hwan DOO ,  Hwan Seok CHUNG

IPC: H04B10/80 ,  H04B10/27

CPC classification number: H04B10/80 ,  H04B10/27

Abstract: Provided are a power management method and apparatus of an ONU supporting a slicing function. A power management method performed by a power management apparatus of an ONU supporting a slicing function includes receiving a first message for discovering a power management attribute of an ONU including at least one slice from an optical line terminal (OLT), transmitting a second message including the power management attribute of the ONU to the OLT in response to the first message received, receiving a third message for setting up a power management parameter for each slice included in the ONU from the OLT, setting up the power management parameter for each slice included in the ONU based on the third message received, and transmitting a fourth message including a set up result of the power management parameter for each slice included in the ONU to the OLT.

公开(公告)号：US20220369007A1

公开(公告)日：2022-11-17

申请号：US17741997

申请日：2022-05-11

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Hwan Seok CHUNG ,  Kyeong Hwan DOO

IPC: H04Q11/00 ,  H04B10/11 ,  H04W72/04

Abstract: Provided are a method of bandwidth allocation for transmitting mobile data and a network device. The bandwidth allocation method includes receiving a cooperative transport interface (CTI) message including a traffic pattern corresponding to a CTI pattern identification (ID) from a distributed unit (DU) of a mobile network, and allocating a bandwidth for transmitting mobile data based on the traffic pattern included in the CTI message.

公开(公告)号：US20210160597A1

公开(公告)日：2021-05-27

申请号：US16952794

申请日：2020-11-19

Applicant: Electronics and Telecommunications Research Institute

Inventor： Kyeong Hwan DOO ,  Kwang Ok KIM ,  Jung-yeol OH ,  Han Hyub LEE ,  Hwan Seok CHUNG

IPC: H04Q11/00 ,  H04J14/02 ,  H04J14/08

Abstract: An integrated dynamic bandwidth allocation method and apparatus in a passive optical network (PON) are provided. The bandwidth allocation method performed by an optical line terminal (OLT) includes generating a service level agreement (SLA) table including an SLA required for calculation for bandwidth allocation corresponding to at least one service queue included in at least one optical network unit (ONU) connected to the OLT, calculating maximum allocatable bandwidths for respective predetermined cycles based on the generated SLA table, and, when a service queue requiring bandwidth allocation is present in the ONU, performing bandwidth allocation according to different bandwidth allocation methods based on a priority level of the service queue using the calculated maximum allocatable bandwidths.

公开(公告)号：US20190356406A1

公开(公告)日：2019-11-21

申请号：US16208867

申请日：2018-12-04

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Kyeong Hwan DOO ,  Kwang Ok KIM ,  Hwan Seok CHUNG

IPC: H04J14/02 ,  H04J14/08 ,  H04Q11/00

Abstract: A bandwidth allocation apparatus and method for providing a low-latency service in an optical network that may guarantee low-latency requirements and improve a network utilization rate by allocating a static bandwidth to an ONU requiring low latency within an allocable bandwidth and by allocating a dynamic bandwidth to an ONU not requiring the low latency within a remaining bandwidth.

公开(公告)号：US20170250753A1

公开(公告)日：2017-08-31

申请号：US15378194

申请日：2016-12-14

Applicant: Electronics and Telecommunications Research Institute

Inventor： Min Kyu SUNG ,  Jong Hyun LEE ,  Hwan Seok CHUNG ,  Seung Hyun CHO ,  Chan Gyo HAN

IPC: H04B10/2513 ,  H04B10/2575

CPC classification number: H04B10/25133 ,  H04B10/25753 ,  H04B10/25754

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：US20160218801A1

公开(公告)日：2016-07-28

申请号：US15007739

申请日：2016-01-27

Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE

Inventor： Hwan Seok CHUNG ,  Seung Hyun CHO ,  Jong Hyun LEE ,  Sang Soo LEE ,  Chan Gyo HAN

IPC: H04B10/079 ,  H04B10/2575

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.

Abstract translation: 可以监视基于无线电光纤（RoF）的移动前端系统的光纤电缆，其包括用于监视根据示例性实施例的模拟光链路的控制装置。 监视控制装置可以包括用于监视通过光纤电缆的光信号的光信号监视器，以及基于监视结果来控制光信号的系统控​​制器。 光信号监视器可以根据从光信号获得的电信号计算平均光功率，载波噪声比（CNR）和非线性分量的大小。 然后，光信号监视器可以控制计算的平均光功率CNR和非线性分量。