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    • 5. 发明申请
    • Phase Comparator
    • 相位比较器
    • US20070229118A1
    • 2007-10-04
    • US11504694
    • 2006-08-16
    • Tatsuya KobayashiHitoyuki TagamiKatsuhiro ShimizuKenkichi Shimomura
    • Tatsuya KobayashiHitoyuki TagamiKatsuhiro ShimizuKenkichi Shimomura
    • H03D13/00
    • H03D13/003
    • A phase comparator includes: first and second detecting units for detecting an amplitude value of a clock signal at falling timing or rising timing of a data signal; an edge comparing unit for identifying as to whether the first detecting unit detects an amplitude value under a rising state or a falling state to output a first identification result, and for identifying as to whether the second detecting unit detects an amplitude value under a rising state or a falling state to output a second identification result; first and second polarity inverting units for inverting a polarity of output of the first and second detecting units; and a signal selecting unit for selecting one of output values of the first and second polarity inverting units in response to a polarity of the data signal to output the selected output value.
    • 相位比较器包括:第一和第二检测单元,用于检测下降定时时钟信号的振幅值或数据信号的上升定时; 边缘比较单元,用于识别第一检测单元是否在升高状态或下降状态下检测振幅值以输出第一识别结果,并且用于识别第二检测单元是否在升高状态下检测振幅值 或下降状态输出第二识别结果; 第一和第二极性反转单元,用于反转第一和第二检测单元的输出的极性; 以及信号选择单元,用于响应于数据信号的极性来选择第一和第二极性反转单元的输出值之一,以输出所选择的输出值。
    • 6. 发明授权
    • Optical amplification repeater and optical amplification repeating and transmitting system
    • 光放大中继器和光放大重复传输系统
    • US06657778B1
    • 2003-12-02
    • US09806456
    • 2001-04-18
    • Kuniaki MotoshimaKatsuhiro ShimizuJunichi NakagawaNaoki Suzuki
    • Kuniaki MotoshimaKatsuhiro ShimizuJunichi NakagawaNaoki Suzuki
    • H04B1012
    • H04B10/2941H04B10/296H04B2210/258H04J14/0221
    • Light signals of first to n-th bands amplified en bloc undergo proper attenuation through an adjustable optical attenuator in conformance with attenuation in an optical fiber connected to input of an optical amplifying repeater apparatus, whereon the light signals are demultiplexed or separated into individual bands and amplified by first to n-th fixed-gain optical amplifiers (#1, . . . , #n) each having a high fixed gain in the respective bands to be subsequently multiplexed by an optical multiplexer and then sent out onto a transmission line. A monitoring light branching device extracts a part of light power of a specific monitoring wavelength, which is then fed to an adjustable attenuator control circuit which controls the attenuation factor of the adjustable optical attenuator so that the light power of the specific wavelength remains constant. The gain of the optical amplifying repeater apparatus at the specific wavelength can thus be determined. By employing as the optical amplifying medium a substantially homogeneous medium, the gain for the other wavelengths can be fixed. The optical amplifying repeater apparatus whose gain is essentially independent of the change in the number of the wavelengths can thus be realized.
    • 第一至第n个频带放大的光信号通过可调节的光衰减器经过适当的衰减,其符合连接到光放大中继器设备的输入的光纤中的衰减,其中光信号被解复用或分离成单个频带, 由第一至第n固定增益光放大器(#1,...,#n)放大,每个固定增益光放大器(#1,...,#n)在各个频带中具有高固定增益,随后由光复用器复用,然后发送到传输线。 监视光分支装置提取特定监视波长的一部分光功率,然后将其馈送到可调节衰减器控制电路,该可调节衰减器控制电路控制可调节光衰减器的衰减因子,使得特定波长的光功率保持恒定。 因此可以确定特定波长的光放大中继器装置的增益。 通过采用基本均匀的介质作为光放大介质,可以固定其它波长的增益。 因此可以实现其增益基本上与波长数量的变化无关的光放大中继器装置。
    • 7. 发明申请
    • OPTICAL COMMUNICATION SYSTEM
    • 光通信系统
    • US20130039643A1
    • 2013-02-14
    • US13642723
    • 2010-04-23
    • Toshiyuki TokuraKatsuhiro ShimizuKazuyuki IshidaTakashi Mizuochi
    • Toshiyuki TokuraKatsuhiro ShimizuKazuyuki IshidaTakashi Mizuochi
    • H04J14/02
    • H04J14/0297H04B10/032H04J14/0295
    • An optical communication system including optical transmission systems each includes a transmission processing unit and a receiving processing unit, wherein the transmission processing unit includes an optical transmission unit that converts electric signals into optical signals, an auxiliary optical transmission unit that converts a part of the electric signals into an optical signal having a wavelength other than wavelengths of the optical signals generated by the optical transmission unit, and outputs the generated optical signal to a different transmission processing unit, and a wavelength multiplexing unit, and the receiving processing unit includes a wavelength demultiplexing unit, an optical receiving unit that converts the optical signals having the wavelengths of the optical signals generated by the optical transmission unit into electric signals, respectively, and an auxiliary optical receiving unit that converts the optical signal having the wavelength of the optical signal generated by the auxiliary optical transmission unit.
    • 包括光传输系统的光通信系统各自包括传输处理单元和接收处理单元,其中传输处理单元包括将电信号转换为光信号的光传输单元,将一部分电 信号转换成具有由光传输单元生成的光信号的波长以外的波长的光信号,并将生成的光信号输出到不同的发送处理单元和波长复用单元,并且接收处理单元包括波长解复用 单元,光接收单元,其将具有由光传输单元生成的光信号的波长的光信号分别转换为电信号;以及辅助光接收单元,其将具有光信号波长的光信号 由辅助光传输单元产生。
    • 8. 发明授权
    • Optical reception device
    • 光接收装置
    • US08059971B2
    • 2011-11-15
    • US11792306
    • 2004-12-28
    • Shunsuke MitaniKazuyuki IshidaKatsuhiro Shimizu
    • Shunsuke MitaniKazuyuki IshidaKatsuhiro Shimizu
    • H04B10/00H04B10/06H04B10/04
    • H04B10/66
    • An optical reception device realizes stabilization of reception sensitivity inexpensively and highly precisely. The optical reception device includes: a Mach-Zehnder type 1-bit delay unit including a one-terminal input port and two-terminal output ports for decoding an optical difference phase shift keying (DPSK) signal and provided with one or more phase control functions to control the phase state of light; photoelectric conversion means for branching a portion of an optical output signal output from the one-side output port of the Mach-Zehnder type 1-bit delay unit, to convert the branched portion into an electric signal; and a phase control unit for controlling the phase state of the Mach-Zehnder type 1-bit delay device by using as an error signal the output signal of the photoelectric conversion means.
    • 光接收装置实现了廉价高精度的接收灵敏度的稳定化。 光接收装置包括:马赫 - 策德尔型1位延迟单元,其包括单端输入端口和用于解码光差分相移键控(DPSK)信号并具有一个或多个相位控制功能的两端输出端口 控制光的相位状态; 光电转换装置,用于对从Mach-Zehnder型1位延迟单元的单面输出端口输出的光输出信号的一部分进行分支,将分支部分转换为电信号; 以及相位控制单元,用于通过使用光电转换装置的输出信号作为误差信号来控制马赫 - 曾德尔型1位延迟装置的相位状态。