公开(公告)号：US07298978B2

公开(公告)日：2007-11-20

申请号：US10384462

申请日：2003-03-06

申请人： Jyung-chan Lee ,  Seung-il Myong ,  Jin-soo Han ,  Je-soo Ko

发明人： Jyung-chan Lee ,  Seung-il Myong ,  Jin-soo Han ,  Je-soo Ko

IPC分类号： H04B10/06

CPC分类号： H04B10/695

摘要： An optical receiver in an optical communication system, and more particularly, to a method and an apparatus for optimizing a decision level of a signal output from an optical receiver to obtain a minimum bit error rate (BER) by measuring output characteristics of the optical receiver and adjusting a reference voltage of the optical receiver based on a measurement result. The provided method includes measuring the strength of an electric signal at a modulated frequency out of the frequency elements of the output electric signal in the optical receiver, generating a reference voltage based on the strength data of the electric signal, inputting the reference voltage to the optical receiver and re-measuring the strength of the electric signal output from the optical receiver to determine whether the strength of the signal is minimum, and maintaining the reference voltage when the strength of the signal is minimum and adjusting the reference voltage in other cases. Thus, the provided method optimizes the distribution of level one and level zero, i.e., a decision level, of the electric signal output from the optical receiver, so the efficiency and the performance of the transferred optical signal are maximized.

摘要翻译： 更具体地，涉及一种用于优化从光接收器输出的信号的判定电平以通过测量光接收器的输出特性来获得最小误码率（BER）来获得最小误码率（BER）的方法和装置， 以及基于测量结果调整所述光接收器的参考电压。 所提供的方法包括测量在光接收机中的输出电信号的频率元素之外的调制频率处的电信号的强度，基于电信号的强度数据产生参考电压，将参考电压输入到 重新测量从光接收器输出的电信号的强度，以确定信号的强度是否最小，并且当信号的强度最小时保持参考电压，并在其他情况下调整参考电压。 因此，所提供的方法优化了从光接收器输出的电信号的一级和零级的分布，即决定级别，从而使传输的光信号的效率和性能最大化。

公开(公告)号：US07068422B2

公开(公告)日：2006-06-27

申请号：US10392614

申请日：2003-03-19

申请人： Jyung-chan Lee ,  Seung-il Myong ,  Moo-jung Chu ,  Hyun-jae Lee

发明人： Jyung-chan Lee ,  Seung-il Myong ,  Moo-jung Chu ,  Hyun-jae Lee

IPC分类号： H04B10/12

CPC分类号： H04B10/2942

摘要： Provided are an optical fiber amplification method and apparatus for controlling a gain. Initial values including target gains of first and second amplifications for an optical amplifier amplifying the input light signal are set. Power of the input light signal is measured and the power of first and second backward pump lights proceeding in the opposite direction to the input light signal is controlled based on the measured power. The input light signal is firstly amplified and a first amplification gain of the amplified light signal is calculated. Power of a first forward pump light proceeding in the same direction as the input light signal is controlled so that the first amplification gain can be substantially equal to the target gain of the first amplification. The firstly amplified light signal is secondly amplified and a second amplification gain with respect to the input light signal is calculated. The power of a second forward pump light proceeding in the same direction as the input light signal is controlled so that the second amplification gain can be substantially equal to the target gain of the second amplification.

公开(公告)号：US06888670B2

公开(公告)日：2005-05-03

申请号：US10364635

申请日：2003-02-11

申请人： Wang-yuhl Oh ,  Seung-il Myong ,  Hyun-jae Lee

发明人： Wang-yuhl Oh ,  Seung-il Myong ,  Hyun-jae Lee

IPC分类号： G02B6/00 ,  H01S3/00 ,  H01S3/067 ,  H01S3/094 ,  H01S3/16 ,  H01S3/23 ,  H01S3/30

CPC分类号： H01S3/302 ,  H01S3/06725 ,  H01S3/06758 ,  H01S3/094011 ,  H01S3/094096 ,  H01S3/1608 ,  H01S3/2375 ,  H01S2301/04

摘要： A low-noise optical fiber amplifier for performing a long-distance optical transmission in a wavelength division multiplexing optical transmission apparatus is provided. This amplifier includes a first optical fiber amplifier having a pre-stage optical fiber, and a first coupler for supplying pump light to the pre-stage optical fiber; a dispersion compensating Raman amplifier (DCRA) connected to the first optical fiber amplifier and having a dispersion compensating optical fiber (DCF) that compensates for the dispersion accumulated in an optical line and generates a Raman gain, and a second coupler for supplying Raman pump light onto the DCF; and a second optical fiber amplifier connected to the DCRA, and including a post-stage optical fiber and a third coupler for supplying pump light onto the post-stage optical fiber. Accordingly, this optical fiber amplifier is used for terrestrial WDM optical transmission, and thus has remarkably low noise figure compared to the existing optical amplifiers. For this reason, the optical fiber amplifier is available in long-distance transmission, and can be used in optical networks.

摘要翻译： 提供了一种用于在波分复用光传输装置中执行长距离光传输的低噪声光纤放大器。 该放大器包括具有前级光纤的第一光纤放大器和用于向前级光纤提供泵浦光的第一耦合器; 连接到第一光纤放大器的色散补偿拉曼放大器（DCRA），并且具有补偿在光线路中累积的色散并产生拉曼增益的色散补偿光纤（DCF），以及用于提供拉曼泵浦光的第二耦合器 到DCF; 以及连接到DCRA的第二光纤放大器，并且包括用于将泵浦光提供到后级光纤上的后级光纤和第三耦合器。 因此，该光纤放大器用于地面WDM光传输，因此与现有的光放大器相比具有非常低的噪声系数。 因此，光纤放大器可用于远距离传输，可用于光网络。

公开(公告)号：US08422593B2

公开(公告)日：2013-04-16

申请号：US12579840

申请日：2009-10-15

申请人： Seung-il Myong ,  Jong-sub Cha ,  Hoe-sung Yang ,  Kang-bok Lee ,  Heyung-sub Lee ,  Jong-suk Chae

发明人： Seung-il Myong ,  Jong-sub Cha ,  Hoe-sung Yang ,  Kang-bok Lee ,  Heyung-sub Lee ,  Jong-suk Chae

IPC分类号： H03K9/06

CPC分类号： H04L27/0014 ,  H04L2027/0026 ,  H04L2027/0046

摘要： Disclosed is a wireless signal receiving apparatus, and more particularly, disclosed is a parallel automatic frequency offset estimation apparatus and method for tracking a frequency offset in an early stage by calculating, in parallel, frequency offsets of a received signal. The parallel automatic frequency offset estimation apparatus includes a receiving unit to receive a data frame; and a frequency offset estimation unit to calculate, in parallel, frequency and phase deviations at different bit intervals within a particular section of the received data frame, to add together the frequency and phase deviations to obtain a first sum of the frequency and phase deviations, and to add the first sum to a frequency phase deviation calculated for each bit after the particular section in the received data frame to obtain a second sum of the frequency and phase deviations. Accordingly, transmission frequency tracking can be performed at higher speed, compared to the conventional systems in which frequency offset acquisition is carried out in stages. Also, accurate tracking of a transmission frequency is possible in an initial frame.

摘要翻译： 公开了一种无线信号接收装置，更具体地，公开了一种并行自动频率偏移估计装置和方法，用于通过并行计算接收信号的频率偏移来跟踪早期的频率偏移。 并行自动频率偏移估计装置包括：接收单元，用于接收数据帧; 以及频率偏移估计单元，用于并行地计算在接收数据帧的特定部分内的不同比特间隔处的频率和相位偏差，以将频率和相位偏差相加以获得频率和相位偏差的第一和， 并且将第一和加到针对接收数据帧中的特定部分之后的每个比特计算的频率相位偏移，以获得频率和相位偏差的第二和。 因此，与分阶段进行频率偏移获取的常规系统相比，可以以更高的速度执行传输频率跟踪。 此外，在初始帧中可以准确地跟踪传输频率。

公开(公告)号：US08401053B2

公开(公告)日：2013-03-19

申请号：US12562105

申请日：2009-09-17

申请人： Jong-sub Cha ,  Seung-il Myong ,  Heyung-sub Lee ,  Sang-hyun Mo ,  Jong-suk Chae

发明人： Jong-sub Cha ,  Seung-il Myong ,  Heyung-sub Lee ,  Sang-hyun Mo ,  Jong-suk Chae

IPC分类号： H04B1/00

CPC分类号： H04J13/10 ,  H04B1/707 ,  H04J13/0022

摘要： An active radio frequency identification (RFID) apparatus having an additional transmitter in addition to a single transmitter is provided. The active RFID apparatus includes a first transmitter including a first pseudo noise (PN) code generator to generate a direct sequence spread spectrum (DSSS) introduced by ISO/IEC (International Organization for Standardization/International Electrotechnical Commission) 24730-2 or ISO/IEC 18185-5 type B; and a second transmitter including a second PN code generator to perform an AND operation on an initial value and a fed back value and shift the resultant value of the AND operation, to perform an XOR operation on particular bits from among the shifted bits and to perform an XOR operation again on the shifted bits and the resulting value of the XOR operation to finally generate a PN code. Accordingly, where an additional PN code is added besides an existing PN code, a PN code having excellent auto correlation characteristics allowing discrimination of the PN code itself and cross-correlation characteristics providing a code discrimination ability with respect to another code can be generated.

摘要翻译： 提供了除了单个发射机之外还具有附加发射机的有源射频识别（RFID）装置。 有源RFID装置包括第一发射机，其包括第一伪噪声（PN）码发生器，以产生由ISO / IEC（国际标准化组织/国际电工委员会）24730-2或ISO / IEC引入的直接序列扩频（DSSS） 18185-5型B; 以及第二发送器，包括第二PN码发生器，用于对初始值和反馈值执行AND运算，并且移位AND运算的结果值，以对从移位中的特定比特执行异或运算，并执行 对移位的位再次进行XOR操作，并且产生XOR运算的结果值，以最终生成PN码。 因此，除了现有的PN码之外附加附加的PN码，可以产生具有能够区分PN码本身的优良自相关特性的PN码和提供相对于其他码的码识别能力的互相关特性。