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    • 7. 发明公开
    • FINDING BIAS VOLTAGES FOR OPTICAL MODULATORS
    • DYNAMISCHE VORSPANNUNGSSTEUERUNGFÜROPTISCHE MACH-ZEHNDER MODULATOREN
    • EP2845050A1
    • 2015-03-11
    • EP13720511.8
    • 2013-04-30
    • BAE Systems PLC
    • SMITH, Andrew JamesNAWAZ, MohammedGILES, Simon, Charles
    • G02F1/01G02F1/21G02F1/225
    • G02F1/0123G02F1/225G02F1/2255G02F2001/212
    • Methods and apparatus for finding a bias voltage (20) corresponding to a quadrature point of an optical modulator, the modulator comprising a biasable component which is configurable to be biased by application of the bias voltage (20) such that the modulator operates at quadrature, the method comprising: providing a target for the output power of the modulator which corresponds to quadrature; applying, to the biasable component, a bias voltage (20) having an initial value; thereafter,finding a value for the bias voltage (20) that biases the biasable component such that the output power of the modulator is within a pre- defined range of the target by, starting at the initial value, alternately increasing and decreasing(or decreasing and increasing)the bias voltage (20) with gradually increasing amplitude; and identifying the found value for the bias voltage (20) as a bias voltage corresponding to a quadrature point of the optical modulator.
    • 用于找到对应于光调制器的正交点的偏置电压(20)的方法和装置,所述调制器包括可偏置组件,其可配置为通过施加偏置电压(20)而被偏置,使得调制器以正交方式操作, 该方法包括:提供对应于正交的调制器的输出功率的目标; 向所述可偏压部件施加具有初始值的偏置电压(20); 此后,找到偏置偏置电压(20)的值,该偏置电压(20)偏置可偏置分量,使得调制器的输出功率在目标的预定义范围内,从初始值开始交替地增加和减少(或减小) 并增加振幅的偏置电压(20); 以及将所述偏置电压(20)的发现值识别为对应于所述光学调制器的正交点的偏置电压。
    • 8. 发明公开
    • CONTROLLING BIAS VOLTAGES FOR OPTICAL MODULATORS
    • 控制光调制器的偏置电压
    • EP2845049A1
    • 2015-03-11
    • EP13720510.0
    • 2013-04-30
    • BAE Systems PLC
    • SMITH, Andrew JamesNAWAZ, Mohammed
    • G02F1/01G02F1/225H04B10/50
    • G02F1/0123G02F1/225G02F1/2255G02F2001/212H04B10/50575H04B10/50595
    • Methods and apparatus for controlling a bias voltage (20) supplied to an optical modulator that comprises a biasable component configurable to be biased by application of the bias voltage (20), the method comprising: providing a target for the modulator output power; applying, to the biasable component, a bias voltage (20) that biases the biasable component so that the output power is within a pre-defined range of the target; monitoring the output power and, if the output power of the modulator is determined to be outside the pre-defined range, varying the value of the bias voltage (20) to bring the output power back within the pre-defined range; and monitoring the optical input to the modulator and, if it has been disabled, maintaining the bias voltage (20) at its current level for a pre-determined length of time that is dependent upon how long the modulator has been operating at quadrature.
    • 用于控制提供给光调制器的偏置电压(20)的方法和装置,所述光调制器包括可配置为通过施加偏置电压(20)而偏置的可偏置部件,所述方法包括:提供调制器输出功率的目标; 向可偏置部件施加偏置可偏置部件的偏置电压(20),使得输出功率在目标的预定义范围内; 监视输出功率,并且如果调制器的输出功率被确定为在预定范围之外,则改变偏置电压(20)的值以使输出功率返回到预定范围内; 以及监视到调制器的光输入,并且如果它已被禁用,则将偏置电压(20)保持在其当前电平一段预定的时间长度,这取决于调制器在正交操作多长时间。