A versatile arbitrary bias control technology for Mach-Zehnder modulators (MZMs) based on a linear-frequency modulated (LFM) signal is proposed. An LFM signal is applied to the direct current (DC) port of an MZM together with a DC voltage. The output microwave signal is measured and cross-correlated with the fundamental and frequency-doubled components of the LFM signal. Their ratio serves as the feedback signal to control the bias point. An experiment is carried out. Compared to the conventional single-frequency pilot-based bias control technique, the peak power of the LFM component in the output electrical signal decreases by more than 27 dB, and the error vector magnitude (EVM) of the output microwave signal evaluated by 1000 symbols is reduced from 13.632% to 5.929%.

中文翻译：

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使用线性频率调制信号的马赫曾德尔调制器的任意偏置点控制

提出了一种基于线性调频（LFM）信号的马赫曾德尔调制器（MZMs）的通用任意偏置控制技术。LFM信号与DC电压一起施加到MZM的直流（DC）端口。测量输出的微波信号，并将其与LFM信号的基本和倍频分量互相关。它们的比率用作控制偏置点的反馈信号。进行了实验。与传统的基于单频导​​频的偏置控制技术相比，输出电信号中LFM分量的峰值功率降低了27 dB以上，并且输出微波信号的误差矢量幅度（EVM）由1000个符号评估从13.632％降至5.929％。