公开(公告)号：US08224190B2

公开(公告)日：2012-07-17

申请号：US12618579

申请日：2009-11-13

Applicant: Hwan-seok Chung ,  Sun-hyok Chang ,  Sang-soo Lee ,  Kwang-joon Kim

Inventor： Hwan-seok Chung ,  Sun-hyok Chang ,  Sang-soo Lee ,  Kwang-joon Kim

IPC: H04B10/04

CPC classification number: H04B10/2557 ,  H04J14/0224 ,  H04J14/0257 ,  H04J14/026 ,  H04J14/0279

Abstract: Provided is a channel assignment method in a wavelength-division-multiplexed transmission system. The channel assignment method includes obtaining information about signal modulation schemes from a plurality of optical transmitters, and assigning channels to the respective optical transmitters in consideration of the obtained information about the signal modulation schemes. Accordingly, in transmission of channels of different modulation formats, cross phase modulation is minimized, thereby reducing inter-channel interference.

Abstract translation: 提供了一种波分复用传输系统中的信道分配方法。 信道分配方法包括从多个光发射机获取关于信号调制方案的信息，并且考虑所获得的关于信号调制方案的信息，向各个光发射机分配信道。 因此，在传输不同调制格式的信道时，交叉相位调制被最小化，从而减少信道间干扰。

公开(公告)号：US20120020676A1

公开(公告)日：2012-01-26

申请号：US12912870

申请日：2010-10-27

Applicant: Hwan-Seok Chung ,  Sun-Hyok Chang ,  Jyung-Chan Lee ,  Kwang-Joon Kim

Inventor： Hwan-Seok Chung ,  Sun-Hyok Chang ,  Jyung-Chan Lee ,  Kwang-Joon Kim

IPC: H04B10/06

CPC classification number: H04B10/677

Abstract: An apparatus for receiving optical signals in DQPSK and method of controlling a phase offset in receiving optical signals for DQPSK is provided. An original optical signal modulated in DQPSK is received. The original optical signal is delayed by one bit to make a delay optical signal such that an interference on the original optical signal and the delay optical signal is performed. A control signal is generated by use of an interference result between the original optical signal and the delay optical signal. A phase offset for the interference between the original optical signal and the delay optical signal is controlled by use of the generated control signal. In receiving optical signals, the phase offset between the delay optical signal and the original optical signal is precisely controlled, thereby optimizing the transfer characteristics of an optical delay interferometer.

Abstract translation: 提供一种用于接收DQPSK中的光信号的装置以及控制接收用于DQPSK的光信号的相位偏移的方法。 接收以DQPSK调制的原始光信号。 原始光信号被延迟一位以产生延迟光信号，使得对原始光信号和延迟光信号的干扰被执行。 通过使用原始光信号和延迟光信号之间的干扰结果来产生控制信号。 通过使用所生成的控制信号来控制原始光信号与延迟光信号之间的干扰的相位偏移。 在接收光信号时，精确控制延迟光信号与原始光信号之间的相位偏移，从而优化光延迟干涉仪的传输特性。

公开(公告)号：US20110008059A1

公开(公告)日：2011-01-13

申请号：US12643087

申请日：2009-12-21

Applicant: Sun-hyok Chang ,  Hwan-seok Chung ,  Kwang-joon Kim

Inventor： Sun-hyok Chang ,  Hwan-seok Chung ,  Kwang-joon Kim

IPC: H04B10/06 ,  H03H7/30

CPC classification number: H04B10/25073 ,  H04B10/2569 ,  H04B10/60 ,  H04B10/611 ,  H04B10/6161 ,  H04B10/6162

Abstract: Disclosed are a digital equalization apparatus for a coherent optical receiver and a digital equalization method for a coherent optical receiver, capable of compensating for chromatic dispersion and polarization impairment through a digital signal processing, and capable of performing a clock recovery and a data recovery through a digital symbol synchronization. The digital equalization apparatus and the method compensate for various impairments occurring on an optical path in a digital manner and achieve synchronization through a simple structure.

Abstract translation: 公开了一种用于相干光接收机的数字均衡装置和用于相干光接收机的数字均衡方法，其能够通过数字信号处理补偿色散和极化损伤，并且能够通过一个数字信号处理器执行时钟恢复和数据恢复 数字符号同步。 数字均衡装置和方法以数字方式补偿在光路上发生的各种损伤，并通过简单的结构实现同步。

公开(公告)号：US20100150576A1

公开(公告)日：2010-06-17

申请号：US12610985

申请日：2009-11-02

Applicant: Hwan-seok Chung ,  Sun-hyok Chang ,  Kwang-joon Kim

Inventor： Hwan-seok Chung ,  Sun-hyok Chang ,  Kwang-joon Kim

IPC: H04B10/04

CPC classification number: H04B10/505 ,  G02F2001/212 ,  H04B10/5561

Abstract: An optical transmitting apparatus is disclosed. The optical transmitting apparatus outputs a signal having the same phase characteristics as a Return-to-Zero Differential Phase-Shift-Keying (RZ-DPSK) signal by using a single phase modulator. Accordingly, it is possible to generate RZ-DPSK signals without using a separate RZ modulator.

Abstract translation: 公开了一种光发射装置。 光发送装置通过使用单相调制器输出具有与归零差分相移键控（RZ-DPSK）信号相同的相位特性的信号。 因此，可以在不使用单独的RZ调制器的情况下产生RZ-DPSK信号。

公开(公告)号：US20100142964A1

公开(公告)日：2010-06-10

申请号：US12581797

申请日：2009-10-19

Applicant: Sun-hyok Chang ,  Hwan-seok Chung ,  Sang-soo Lee ,  Kwang-joon Kim

Inventor： Sun-hyok Chang ,  Hwan-seok Chung ,  Sang-soo Lee ,  Kwang-joon Kim

IPC: H04B10/04 ,  H04B10/00 ,  H04B10/12

CPC classification number: H04B10/50575 ,  H04B10/5053

Abstract: An optical transmission apparatus for high-speed optical signal transmission is provided. The optical transmission apparatus includes an optical modulator which includes first and second modulators of a Mach-Zehnder (MZ) interferometer type which are connected in parallel, and an output stabilizer which controls biases for the first modulator, the second modulator and the optical modulator and stabilizes a final output optical signal of the optical modulator. The optical transmission apparatus can perform a stable optical signal output.

Abstract translation: 提供了一种用于高速光信号传输的光传输装置。 光传输装置包括光调制器，其包括并联连接的马赫 - 曾德（MZ）干涉仪类型的第一和第二调制器和控制第一调制器，第二调制器和光调制器的偏置的输出稳定器，以及 稳定光调制器的最终输出光信号。 光传输装置可以执行稳定的光信号输出。

公开(公告)号：US20090080892A1

公开(公告)日：2009-03-26

申请号：US12121435

申请日：2008-05-15

Applicant: Sun-hyok Chang ,  Hwan-seok Chung ,  Sang-soo Lee ,  Young-hwa Kim ,  Kwang-joon Kim

Inventor： Sun-hyok Chang ,  Hwan-seok Chung ,  Sang-soo Lee ,  Young-hwa Kim ,  Kwang-joon Kim

IPC: H04J14/02

CPC classification number: H04J14/0297 ,  H04J14/0227 ,  H04J14/0246 ,  H04J14/025

Abstract: A network node and method for guaranteeing the role of an optical supervisory channel (OSC) in an optical transport network (OTN) are provided. In the network node, at least two OSC units are multiplexed, one of the OSC units is set as a main unit, the other OSC unit is set as an auxiliary unit; and the auxiliary unit is activated when the main unit cannot be operated. Thereby, the network node can guarantee the stable role of the OSC.

Abstract translation: 提供了一种用于保证光传输网络（OTN）中的光监控信道（OSC）的作用的网络节点和方法。 在网络节点中，至少两个OSC单元被复用，其中一个OSC单元被设置为主单元，另一个OSC单元被设置为辅助单元; 并且当主机不能操作时，辅助单元被激活。 因此，网络节点可以保证OSC的稳定作用。

公开(公告)号：US06559989B1

公开(公告)日：2003-05-06

申请号：US09499934

申请日：2000-02-08

Applicant: Kwang Joon Kim ,  Ji Wook Youn ,  Hee Sang Chung ,  Sung Un Lee ,  Jong Hyun Lee

Inventor： Kwang Joon Kim ,  Ji Wook Youn ,  Hee Sang Chung ,  Sung Un Lee ,  Jong Hyun Lee

IPC: H04J1408

CPC classification number: H04Q11/0005 ,  H04J14/08 ,  H04Q2011/0041

Abstract: An optical packet header processing apparatus for processing a header of an optical packet expressing an address of a destination node to control a switching operation of an optical packet switch. The optical packet header processing apparatus comprises a beam splitter for splitting the optical packet header into a predetermined number of optical packet header elements, and a plurality of time interval detectors. Each of the time interval detectors receives a corresponding one of the optical packet header elements from the beam splitter and outputs a detect optical pulse if a pair of optical pulses having a predetermined time interval therebetween are present in the received optical packet header element. A plurality of optical pulse detectors are adapted to convert the detect optical pulses from the time interval detectors into electrical signals and transfer the converted electrical signals to the optical packet switch, respectively. Therefore, the optical packet switch determines the destination node in response to the electrical signals from the optical pulse detectors and outputs the optical packet to an output port corresponding to the determined destination node.

Abstract translation: 一种光分组报头处理装置，用于处理表示目的地节点的地址的光分组的报头以控制光分组交换机的切换操作。 光分组报头处理装置包括分光器，用于将光分组报头分割成预定数量的光分组报头元素，以及多个时间间隔检测器。 每个时间间隔检测器从分束器接收相应的一个光分组报头元件，并且如果在接收的光分组报头元件中存在其间具有预定时间间隔的一对光脉冲，则输出检测光脉冲。 多个光脉冲检测器适于将来自时间间隔检测器的检测光脉冲转换为电信号，并将转换后的电信号分别传送到光分组交换机。 因此，光分组交换机响应于来自光脉冲检测器的电信号来确定目的地节点，并将光分组输出到与确定的目的地节点对应的输出端口。

公开(公告)号：US06529319B2

公开(公告)日：2003-03-04

申请号：US09827211

申请日：2001-04-06

Applicant: Ji-Wook Youn ,  Kwang-Joon Kim ,  Hee-Sang Chung ,  Jong-Hyun Lee

Inventor： Ji-Wook Youn ,  Kwang-Joon Kim ,  Hee-Sang Chung ,  Jong-Hyun Lee

IPC: H04B1012

CPC classification number: H01S3/06754 ,  H01S3/06758 ,  H01S3/10015 ,  H01S3/1301 ,  H01S2301/04

Abstract: The present invention is to provide an automatic gain-controlled optical fiber amplifier, comprising: a first optical branch for branching a portion of an optical signal inputted into the optical fiber amplifier; a second optical branch for branching a portion of an optical signal outputted from the optical fiber amplifier; an optical distributor for receiving the optical signal of an input side branched partially by the first optical branch and for outputting it separately; a first wavelength selector for receiving the optical signal of a one side distributed by the optical distributor and for selecting a predetermined wavelength optical signal; a second wavelength selector for receiving the optical signal of an output side branched partially by the second optical branch and for selecting the predetermined wavelength optical signal; a signal processor for receiving the optical signal of a second side distributed by the optical distributor and the predetermined wavelength optical signal selected by the first and second optical wavelength selector and for measuring a total power of an input signal and a number of input channels; and a controller for generating a control signal according to the total power of the input signal and the number of input channels measured by the signal processor.

Abstract translation: 本发明提供一种自动增益控制光纤放大器，包括：第一光分路，用于分支输入到光纤放大器的光信号的一部分; 第二光分支，用于分支从所述光纤放大器输出的光信号的一部分; 光分配器，用于接收由第一光分支部分地分支的输入侧的光信号，并分别输出; 第一波长选择器，用于接收由光分配器分配的一侧的光信号并用于选择预定波长的光信号; 第二波长选择器，用于接收由第二光分支部分分支并用于选择预定波长光信号的输出侧的光信号; 信号处理器，用于接收由光分配器分配的第二侧的光信号和由第一和第二光波长选择器选择的预定波长光信号，并用于测量输入信号和多个输入通道的总功率; 以及控制器，用于根据输入信号的总功率和由信号处理器测量的输入通道的数量产生控制信号。

公开(公告)号：US6097529A

公开(公告)日：2000-08-01

申请号：US137691

申请日：1998-08-21

Applicant: Hyuek Jae Lee ,  Kwang Joon Kim ,  Hye Young Kim ,  Seok Youl Kang

Inventor： Hyuek Jae Lee ,  Kwang Joon Kim ,  Hye Young Kim ,  Seok Youl Kang

IPC: G02F1/00 ,  H04B10/299 ,  G02F1/01 ,  H04B10/04

CPC classification number: H04B10/299

Abstract: An apparatus for enhancing the extinction ratio in an optical NRZ-to-RZ converting system, and an optical modulation system, are disclosed. The extinction ratio is improved by using an optical fiber loop mirror together with optical amplifiers. The apparatus for enhancing the extinction ratio includes a variable coupling means for receiving external signals to split them to respective terminals of a loop mirror. A variable optical delaying means delays the phases of the signals after their dispersion by the variable coupling means. An optical amplifying means positioned asymmetrically smaller than a bit time of an RZ signal pattern inputted slightly departed from the center of the loop mirror amplifies the optical intensity, and varies the refractive index so as to cause a phase delay. A polarization adjusting means adjusts the polarization of the optical signals, and an optical band pass filtering means removes noises from signals outputted from the loop mirror. The apparatus is used in an optical NRZ-to-RZ converting system.

Abstract translation: 公开了一种用于增强光学NRZ至RZ转换系统中的消光比的装置和光学调制系统。 通过与光放大器一起使用光纤环路镜来提高消光比。 用于增强消光比的装置包括用于接收外部信号以将其分离到环形反射镜的相应端子的可变耦合装置。 可变光延迟装置通过可变耦合装置使信号的相位在其分散之后延迟。 一个光学放大装置的位置不对称地小于从环形镜的中心稍微偏离的RZ信号图形的位时间放大光强度，并且改变折射率以引起相位延迟。 偏振调整装置调节光信号的极化，光带通滤波装置从环形反射镜输出的信号中去除噪声。 该装置用于光学NRZ至RZ转换系统。

公开(公告)号：US08681885B2

公开(公告)日：2014-03-25

申请号：US12872506

申请日：2010-08-31

Applicant: Hwan-Seok Chung ,  Sun-Hyok Chang ,  Kwang-Joon Kim

Inventor： Hwan-Seok Chung ,  Sun-Hyok Chang ,  Kwang-Joon Kim

IPC: H04K1/10

CPC classification number: H04L27/2647 ,  H04L27/0014 ,  H04L27/2657 ,  H04L27/364

Abstract: An OFDM receiver for compensating for I/Q imbalance is provided. The OFDM receiver includes an I/Q demodulator demodulating a received signal into a baseband in-phase (I) channel signal and a baseband quadrature (Q) channel signal, and an I/Q imbalance compensator compensating for imbalance between the I-channel signal and the Q-channel signal in a time domain. Accordingly, it is possible to solve the I/Q imbalance and suppress degradation in the performance of the OFDM communication device.

Abstract translation: 提供了用于补偿I / Q不平衡的OFDM接收机。 OFDM接收机包括将接收信号解调为基带同相（I）信道信号和基带正交（Q）信道信号的I / Q解调器，以及补偿I信道信号之间的不平衡的I / Q不平衡补偿器 和时域中的Q信道信号。 因此，可以解决I / Q不平衡并且抑制OFDM通信设备的性能的劣化。