Clock recovery system with triggered phase error measurement
    1.
    发明授权
    Clock recovery system with triggered phase error measurement 有权
    具有触发相位误差测量的时钟恢复系统

    公开(公告)号:US07571339B2

    公开(公告)日:2009-08-04

    申请号:US11407515

    申请日:2006-04-19

    Abstract: A measurement system includes a clock recovery system and a measurement module coupled to the clock recovery system. The clock recovery system has an associated response characteristic. The clock recovery system receives an input signal and recovers a clock signal from the input signal. The measurement module is coupled to the clock recovery system and measures a phase error signal received from the clock recovery system, time-referenced to a trigger signal that is applied to the measurement module, where the phase error signal represents the phase difference between the input signal and the recovered clock signal. A processor applies the associated response characteristic to the measured phase error signal to determine the phase of the input signal.

    Abstract translation: 测量系统包括时钟恢复系统和耦合到时钟恢复系统的测量模块。 时钟恢复系统具有相关的响应特性。 时钟恢复系统接收输入信号并从输入信号中恢复时钟信号。 测量模块耦合到时钟恢复系统,并测量从时钟恢复系统接收的相位误差信号,时间参考应用于测量模块的触发信号,其中相位误差信号表示输入端之间的相位差 信号和恢复的时钟信号。 处理器将相关联的响应特性应用于所测量的相位误差信号以确定输入信号的相位。

    Optical phase standard
    4.
    发明授权
    Optical phase standard 失效
    光学相位标准

    公开(公告)号:US07064839B2

    公开(公告)日:2006-06-20

    申请号:US10427622

    申请日:2003-04-30

    CPC classification number: G01M11/338 G01M11/331

    Abstract: An optical phase standard includes a coupler dividing an applied optical signal between a measurement interferometer and a frequency reference branch. Resulting signals at the outputs of the measurement interferometer and the frequency reference branch are sampled. The samples acquired at the output of the frequency reference branch are mapped to optical frequencies that are traceable to a frequency standard provided by an absorption cell. This mapping determines the optical frequencies at which the samples acquired are at the output of the measurement interferometer. From the acquired samples at the output of the measurement interferometer, phase characteristics of a device under test (DUT) are extracted. Aspects of the optical phase standard are alternatively implemented according to an optical phase standardization method.

    Abstract translation: 光学相位标准包括在测量干涉仪和频率参考分支之间划分施加的光信号的耦合器。 对测量干涉仪和频率参考分支的输出端产生的信号进行采样。 在频率参考分支的输出处获取的样本被映射到可追溯到由吸收单元提供的频率标准的光频率。 该映射确定所获取的样本在测量干涉仪的输出处的光频率。 从测量干涉仪输出端的采集样本中,提取被测器件(DUT)的相位特性。 根据光学相位标准化方法交替实现光学相位标准的方面。

    Antenna sampling system
    5.
    发明授权
    Antenna sampling system 失效
    天线采样系统

    公开(公告)号:US4170759A

    公开(公告)日:1979-10-09

    申请号:US792942

    申请日:1977-05-02

    CPC classification number: H01Q3/24 H04B7/10

    Abstract: Each of a plurality of antenna sectors is sequentially coupled to a receiver via an antenna switch. The switch is operated by control logic circuitry which monitors the peak signal levels of the signals received by each sector. Unique circuitry is implemented which prevents the control logic from responding to spurious transient signals processed by the receiver's tuned circuits following each instance of antenna switching.

    Abstract translation: 多个天线扇区中的每一个通过天线开关顺序地耦合到接收机。 开关由控制逻辑电路操作,监控由每个扇区接收的信号的峰值信号电平。 实现独特的电路,防止控制逻辑响应在天线切换的每个实例之后由接收机的调谐电路处理的杂散瞬态信号。

    Multi-wavelength polarization scrambling device
    6.
    发明授权
    Multi-wavelength polarization scrambling device 失效
    多波长偏振加扰装置

    公开(公告)号:US6137925A

    公开(公告)日:2000-10-24

    申请号:US198903

    申请日:1998-11-24

    CPC classification number: G02F1/0136 G02F2001/0139

    Abstract: A polarization scrambling device randomly varies the polarization states of multiple applied optical signals. The scrambling device includes a polarization scrambler coupled to a wavelength-dependent polarization randomizer having cascaded birefringent elements in which the axes of polarization of the cascaded elements are rotationally offset. The scrambling device causes random variations in the relative and the absolute polarization states of the applied optical signals. The birefringence, lengths, and number of cascaded birefringent elements are chosen to assure that the polarization states of optical signals at the different wavelengths are sufficiently randomized, even when the applied optical signals are closely spaced in frequency.

    Abstract translation: 偏振加扰装置随机改变多个施加的光信号的偏振状态。 加扰装置包括耦合到具有级联双折射元件的波长相关偏振随机化器的偏振加扰器,其中级联元件的偏振轴被旋转偏移。 加扰装置引起所施加的光信号的相对和绝对极化状态的随机变化。 选择级联双折射元件的双折射,长度和数量,以确保不同波长处的光信号的极化状态被充分随机化,即使所施加的光信号在频率上紧密间隔。

    Diffraction grating position sensing and control for a scanning
monochromator
    7.
    发明授权
    Diffraction grating position sensing and control for a scanning monochromator 失效
    扫描单色仪的衍射光栅位置检测和控制

    公开(公告)号:US5359409A

    公开(公告)日:1994-10-25

    申请号:US98559

    申请日:1993-07-28

    Abstract: A double-pass scanning monochromator for use in an optical spectrum analyzer includes an input optical fiber for emitting an input light beam, a diffraction grating for diffracting the input light beam to produce a spatially dispersed light beam, a slit for passing a selected portion of the dispersed light beam, a motor for rotating the diffraction grating, a shaft angle encoder for sensing grating position, and an output optical fiber. The light that passes through the slit is directed to the diffraction grating and is recombined by the diffraction grating to produce an output light beam. The light beam to be analyzed is incident on the diffraction grating during first and second passes. A polarization rotation device rotates the polarization components of the light beam by 90.degree. between the first and second passes so that the output of the monochromator is independent of the polarization of the input light beam. The output optical fiber is translated by a micropositioning assembly in a plane perpendicular to the output light beam during rotation of the diffraction grating to automatically track the output light beam and to provide optical chopping.

    Abstract translation: 用于光谱分析仪的双通扫描单色仪包括用于发射输入光束的输入光纤,用于衍射输入光束以产生空间分散的光束的衍射光栅,用于使所选择的部分通过的狭缝 分散的光束,用于旋转衍射光栅的电动机,用于感测光栅位置的轴角编码器和输出光纤。 通过狭缝的光被引导到衍射光栅,并且被衍射光栅重新组合以产生输出光束。 要分析的光束在第一次和第二次通过期间入射到衍射光栅上。 偏振旋转装置在第一和第二遍之间使光束的偏振分量旋转90°,使得单色仪的输出与输入光束的偏振无关。 在衍射光栅旋转期间,输出光纤由垂直于输出光束的平面中的微定位组件平移,以自动跟踪输出光束并提供光学切割。

    Optical spectrum analyzer having double-pass monochromator
    8.
    发明授权
    Optical spectrum analyzer having double-pass monochromator 失效
    具有双通道单色显示器的光谱分析仪

    公开(公告)号:US5233405A

    公开(公告)日:1993-08-03

    申请号:US788444

    申请日:1991-11-06

    Abstract: A double pass scanning monochromator for use in an optical spectrum analyzer includes an input optical fiber for emitting an input light beam, a diffraction grating for diffracting the input light beam to produce a spatially dispersed light beam, a slit for passing a selected portion of the dispersed light beam, a motor for rotating the diffraction grating, a shaft angle encoder for sensing grating position, and an output optical fiber. The light that passes through the slit is directed to the diffraction grating and is recombined by the diffraction grating to produce an output light beam. The light beam to be analyzed is incident on the diffraction grating during first and second passes. A polarization rotation device rotates the polarization components of the light beam by 90.degree. between the first and second passes so that the output of the monochromator is independent of the polarization of the input light beam. The output optical fiber is translated by a micropositioning assembly in a plane perpendicular to the output light beam during rotation of the diffraction grating to automatically track the output light beam and to provide optical chopping.

    Sectored antenna receiving system
    9.
    发明授权
    Sectored antenna receiving system 失效
    天线接收系统

    公开(公告)号:US4317229A

    公开(公告)日:1982-02-23

    申请号:US124484

    申请日:1980-02-25

    CPC classification number: H04B7/0808 H04W16/24

    Abstract: A plurality of horizontally directive antenna sectors are arranged in a configuration to receive signals from remote transmitters over a given angle in the horizontal plane. A scanning system is operative in one of several modes to sequentially couple each sector to a receiver. In its first mode, each sector is sequentially scanned with the peak signal level therefrom being compared to a reference level. If the signal level on any sector exceeds the reference level the scanner activates to its second mode wherein scanning of all sectors continues for a predetermined interval after which the system advances to a selective scanning mode wherein scan is limited to that sector with the largest stored signal level relative to the reference level, and to those sectors adjacent said sector for a predetermined time interval. At the end of this interval, scanning is inhibited and the receiver is coupled to that sector which exhibited the strongest relative signal level during the scanning sequences. In this listen mode, if the signal level from the sector falls to a minimum level or a coded squelch is undetected for a given period, the system reverts to the first scanning mode.The system periodically updates the reference levels to account for changes in background noise or the presence of an interfering signal.

    Abstract translation: 多个水平方向天线扇区被布置成在水平面中以给定的角度接收来自远程发射机的信号。 扫描系统以几种模式中的一种工作,以将每个扇区顺序耦合到接收器。 在其第一模式中,每个扇区被依次扫描,其峰值信号电平与参考电平进行比较。 如果任何扇区上的信号电平超过参考电平,则扫描器激活到其第二模式,其中所有扇区的扫描继续进行预定的间隔,之后系统前进到选择扫描模式,其中扫描限于具有最大存储信号的扇区 相对于参考电平的电平,以及与所述扇区相邻的扇区达预定的时间间隔。 在该间隔结束时,扫描被禁止,并且接收器耦合到在扫描序列期间显示出最强的相对信号电平的扇区。 在该监听模式中,如果来自扇区的信号电平下降到最小电平或在给定周期内未检测到编码静噪,则系统恢复到第一扫描模式。 系统周期性地更新参考电平以考虑背景噪声的变化或干扰信号的存在。

    Pattern-triggered measurement system
    10.
    发明申请
    Pattern-triggered measurement system 审中-公开
    模式触发测量系统

    公开(公告)号:US20080072130A1

    公开(公告)日:2008-03-20

    申请号:US11444734

    申请日:2006-05-31

    CPC classification number: H04L7/08 H04L7/033

    Abstract: A measurement system recovers a clock signal from an applied signal that includes a repeating bit pattern, provides a trigger signal synchronized to occurrences of the repeating bit pattern, acquires a set of data samples time-referenced to the trigger signal, and acquires a set of phase error samples of a phase error signal provided by a clock recovery system, wherein the acquired set of phase error samples is also time-referenced to the trigger signal.

    Abstract translation: 测量系统从包括重复位模式的施加信号恢复时钟信号,提供与重复位模式发生同步的触发信号,获取时间参考触发信号的一组数据采样,并获取一组 由时钟恢复系统提供的相位误差信号的相位误差样本,其中所获取的相位误差采样集合也以时间参考触发信号。

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