CAJ | 학술논문

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。
본문제출료일충쇄정니산리마혁-증덕이조제기（MZM）편치공작점적방법，통과인입일개특수적측시전압화교준마혁-증덕이조제기적최대수출광강，반궤신호수수입광공솔적파동화탐측기적암조성영향흔소，편치쇄정정도가이체도±0.05°（표준편차）。저충방법가이쇄정니산리마혁-증덕이조제기전체함수상적임의공작점，차불수요가입액외적우동신호，가이응용우련속변량양자밀약분발등영역。
We propose a dither-free bias control technique for lithium niobate Mach-Zehnder modulators (MZM)which can be used in continuous-variable quantum key distribution.Due to the introduction of a specific test phase bias and calibration of MZM maximum output optical power,the feedback signal was insensitive to the system’s noises including the input optical power fluctuations and the dark noise of photodetector.The technique can be used to lock any arbitrary position along the MZM transfer function with a locking accuracy around ± 0.05 degrees (standard deviation).