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本文提出了一种锁定铌酸锂马赫-曾德尔调制器(MZM)偏置工作点的方法 ,通过引入一个特殊的测试电压和校准马赫-曾德尔调制器的最大输出光强,反馈信号受输入光功率的波动和探测器的暗噪声影响很小,偏置锁定精度可以达到±0.05°(标准偏差)。这种方法可以锁定铌酸锂马赫-曾德尔调制器传递函数上的任意工作点,且不需要加入额外的扰动信号,可以应用于连续变量量子密钥分发等领域。
In this paper, a method to lock the bias point of Mach-Zehnder modulator (MZM) is proposed. By introducing a special test voltage and calibrating the maximum output intensity of the Mach-Zehnder modulator, the feedback signal is input The fluctuation of optical power and the dark noise of the detector have little effect, and the bias lock precision can reach ± 0.05 ° (standard deviation). This method can lock any point in the transfer function of Mach-Zehnder modulator, and does not need to add additional disturbance signals, so it can be used in the field of continuous variable quantum key distribution.