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    • 42. 发明申请
    • ROF link apparatus for selecting IF band to process service signals through MMF and method for selecting IF band
    • 用于通过MMF选择IF频带以处理服务信号的ROF链路装置和用于选择IF频带的方法
    • US20070046836A1
    • 2007-03-01
    • US11504858
    • 2006-08-16
    • Sung-Kee KimSeong-Taek HwangByung-Jik KimSang-Ho KimGyu-Woong LeeJae-Hoon LeeYong-Gyoo KimHan-Lim LeeHoon Kim
    • Sung-Kee KimSeong-Taek HwangByung-Jik KimSang-Ho KimGyu-Woong LeeJae-Hoon LeeYong-Gyoo KimHan-Lim LeeHoon Kim
    • H04N5/50
    • H04B10/2575
    • Disclosed is an ROF link apparatus for selecting an IF band in order to process various service signals through an MMF, which including transmitters for receiving the service signals, performing IF modulation for the service signals, and transferring the modulated IF signals, a first controller for scanning frequency characteristics of the MMF, searching for flat frequency bands, and transferring information regarding the flat frequency band, thereby controlling IF modulation to be performed, a link unit for combining the IF signals with output signals of the first controller, converting the combined signals into optical signals, transmitting the optical signals, converting the optical signals into electrical signals, and splitting the electrical signals, a second controller for receiving the output signals of the first controller, detecting information regarding the flat frequency band, and transferring the information to receivers, thereby controlling modulation to be performed, and the receivers for receiving the IF modulated signals, receiving the information from the second controller, and performing RF modulation.
    • 公开了一种用于选择IF频带以便通过MMF处理各种服务信号的ROF链路装置,该MMF包括用于接收服务信号的发射机,对服务信号执行IF调制,以及传送调制的IF信号,第一控制器 MMF的扫描频率特性,搜索平坦频带,以及传送关于平坦频带的信息,由此控制要执行的IF调制;用于将IF信号与第一控制器的输出信号组合的链路单元,转换组合信号 传输光信号,将光信号转换为电信号,分割电信号;第二控制器,用于接收第一控制器的输出信号,检测关于平坦频带的信息,以及将信息传送到接收机 ,从而控制要进行的调制 用于接收IF调制信号的接收机,从第二控制器接收信息,并执行RF调制。
    • 43. 发明申请
    • Wavelength-division-multiplexed passive optical network using wavelength-locked optical transmitter
    • 使用波长锁定光发射机的波分复用无源光网络
    • US20060291776A1
    • 2006-12-28
    • US11471152
    • 2006-06-20
    • Jae-Hoon LeeYong-Gyoo KimYun-Je OhSeong-Taek Hwang
    • Jae-Hoon LeeYong-Gyoo KimYun-Je OhSeong-Taek Hwang
    • G02B6/28
    • H04J14/0226H04J14/02H04J14/0246H04J14/025H04J14/0282
    • Disclosed is a wavelength-division-multiplexed passive optical network using a wavelength-locked optical transmitter. The wavelength-division-multiplexed passive optical network (WDM PON) includes a central office, which includes a plurality of downstream optical transmitters for outputting downstream optical signals having wavelengths according to downstream injection lights, a wavelength division multiplexer including a plurality of de-multiplexing ports linked to the plurality of the downstream optical transmitters by one-to-one, and a multiplexing port linked with the feeder fiber and performing wavelength division multiplexing and wavelength division de-multiplexing, and at least one optical switch interposed between the downstream optical transmitters and the de-multiplexing ports, inputting a downstream band light output from a selected downstream optical transmitter to the multiplexing port, and inputting a downstream optical signal output from a remaining downstream optical transmitter, which is not selected, to the de-multiplexing port.
    • 公开了使用波长锁定光发射机的波分复用无源光网络。 波分复用无源光网络(WDM PON)包括中心局,其包括多个下行光发射机,用于输出具有根据下游注入光的波长的下行光信号,波分多路复用器包括多个解复用 通过一对一连接到多个下游光发射机的端口,以及与馈电光纤链接并执行波分复用和波分解除复用的复用端口,以及插入在下行光发射机之间的至少一个光开关 以及解复用端口,将从所选择的下游光发射机输出的下行带光输入到复用端口,以及将未被选择的剩余下行光发射机输出的下行光信号输入到解复用端口。
    • 45. 发明申请
    • Duo-binary optical transmitter tolerant to chromatic dispersion
    • 二进制光发射机容忍色散
    • US20060072924A1
    • 2006-04-06
    • US11216761
    • 2005-08-31
    • Jae-Hoon LeeByung-Jik KimSeong-Taek Hwang
    • Jae-Hoon LeeByung-Jik KimSeong-Taek Hwang
    • H04B10/04
    • H04B10/2513H04B10/5167
    • A duo-binary optical transmitter tolerant to a chromatic dispersion includes a pre-coder for generating a first 2-level signal from input binary data and generating a second signal having a waveform obtained by inverting the first signal, a Mach-Zehnder Modulator (MZM) for generating a Differential Phase Shift Keying (DPSK) modulated optical signal by modulating an input light according to the first signal and the second signal, and a Delay Interferometer (DI) for splitting the DPSK modulated optical signal into a first split signal and a second split signal, delaying the second split signal, and generating a duo-binary optical signal by interfering the first split signal with the second delayed split signal, wherein a time required for delaying the second split signal is set to 0.5˜0.8 bit.
    • 一种容忍色散的双二进制光发射机包括一个预编码器,用于从输入的二进制数据产生第一个2电平信号,并产生具有通过反转第一个信号获得的波形的第二个信号,马赫 - 曾德调制器(MZM ),用于通过根据第一信号和第二信号调制输入光来产生差分相移键控(DPSK)调制光信号;以及延迟干涉仪(DI),用于将DPSK调制的光信号分离成第一分离信号和 第二分割信号,延迟第二分割信号,以及通过用第二延迟分离信号干扰第一分离信号来产生二进制二进制光信号,其中延迟第二分割信号所需的时间被设置为0.5〜0.8比特。
    • 50. 发明申请
    • HYDRAULIC SYSTEM FOR CONSTRUCTION MACHINE
    • 建筑机械液压系统
    • US20150159682A1
    • 2015-06-11
    • US14416201
    • 2012-07-27
    • Sang-Ki BaeJae-Hoon Lee
    • Sang-Ki BaeJae-Hoon Lee
    • F15B20/00F15B15/20
    • F15B20/007E02F9/2235E02F9/2285E02F9/2296F15B11/0423F15B15/202F15B2211/20546F15B2211/40507F15B2211/41563F15B2211/50518F15B2211/5157F15B2211/6306F15B2211/6309F15B2211/6652
    • A hydraulic system provided with a relief valve for a construction machine is disclosed, which can reduce a discharge flow rate of a hydraulic pump when a relief valve is operated. The hydraulic system for a construction machine includes a variable displacement hydraulic pump connected to an engine, an attachment operation device outputting an operation signal in proportion to an operation amount by an operator, an attachment actuator connected to the hydraulic pump to be driven by an operation of the attachment operation device, a control valve installed in a flow path between the hydraulic pump and the attachment actuator and shifted to control a start, a stop, and a direction change of the attachment actuator, an orifice installed in a flow path branched from a discharge flow path of the hydraulic pump, a relief valve installed on a downstream side of the orifice in the flow path, and a controller outputting a control signal to a flow control valve of the hydraulic pump so as to reduce a discharge flow rate of the hydraulic pump when a difference between pressures before and after the orifice exceeds a predetermined value.
    • 公开了一种设置有用于建筑机械的安全阀的液压系统,其可以在减压阀操作时降低液压泵的排出流量。 用于建筑机械的液压系统包括连接到发动机的可变排量液压泵,与操作者的操作量成比例地输出操作信号的附接操作装置,连接到液压泵以由操作驱动的附接致动器 安装在液压泵和安装致动器之间的流动路径中的控制阀,并且移动以控制附接致动器的起动,停止和方向改变;安装在流路中的孔, 液压泵的排出流路,安装在流路中的孔口的下游侧的安全阀,以及向液压泵的流量控制阀输出控制信号的控制器,以减少液压泵的排出流量 当孔之前和之后的压力之间的差异超过预定值时,液压泵。