Control of an optical modulator for desired biasing of data and pulse modulators
    1.
    发明授权
    Control of an optical modulator for desired biasing of data and pulse modulators 有权
    用于数据和脉冲调制器的所需偏置的光调制器的控制

    公开(公告)号:US07394992B2

    公开(公告)日:2008-07-01

    申请号:US10386358

    申请日:2003-03-11

    IPC分类号: H04B10/16 H04B10/00 H04B10/04

    摘要: In an optical transmitter, continuous wave light from a laser passes through a data modulator (DM) for non-return-to-zero (NRZ) encoding of a data stream and through a pulse modulator to add return-to-zero encoding to the modulated optical signal. A modulator controller monitors the output optical signal power, optimizes the bias setting for the DM and the PM, and optimizes the phase relationship between the pulse and data components of the modulated optical signal. For each optimization, a low amplitude and low frequency dither signal is injected at appropriate points in the modulator. A single photo detector and electrical receiver are used in a multiplexed fashion to monitor the optical output signal and derive separate feedback signals. Remaining control circuitry forces a null in a respective residual dither component in the optical output signal to maintain the desired bias level or phase alignment.

    摘要翻译: 在光发射机中,来自激光器的连续波光通过用于数据流的非归零(NRZ)编码的数据调制器(DM),并通过脉冲调制器将归零编码添加到 调制光信号。 调制器控制器监视输出光信号功率,优化DM和PM的偏置设置,并优化调制光信号的脉冲和数据分量之间的相位关系。 对于每个优化,在调制器中的适当点处注入低振幅和低频抖动信号。 以多路复用方式使用单个光电检测器和电接收器来监测光输出信号并导出单独的反馈信号。 剩余控制电路迫使光输出信号中的相应残余抖动分量中的零,以保持期望的偏置电平或相位对准。

    Grass seed head suppression process
    2.
    发明授权
    Grass seed head suppression process 失效
    草种头抑制过程

    公开(公告)号:US4664697A

    公开(公告)日:1987-05-12

    申请号:US757395

    申请日:1985-07-22

    IPC分类号: A01N43/653 A01N43/64

    CPC分类号: A01N43/653

    摘要: Mixtures of an acetanilide derivative and a triazole derivative are found to have surprising efficacy in suppressing seed head development in turf grasses.

    摘要翻译: 发现乙酰苯胺衍生物和三唑衍生物的混合物具有令人惊奇的抑制草坪草种子头发育的功效。