马赫-曾德尔电光调制器偏置点稳定控制技术研究

s a core component in the field of high-speed optical communication, the stability of the bias point of the Mach-Zehnder electro-optical modulator has a direct impact on the stability of the entire optical communication system. In order to ensure the stable operation of the whole communication system, the bias point of the Mach-Zehnder modulator needs to be precisely controlled to the optimal bias position for a long time. In this paper, the working prResearch on the Stable Control Technology for Common Bias Points in MZ Electro-Optic Modulatorsinciple of Mach-Zehnder modulator is analyzed by formula derivation, and the feasibility of control technology based on perturbation signal detection is theoretically analyzed. In the paper, STM32 is used as the control unit to verify the automatic control scheme based on the bias point of the perturbation signal, which utilizes the Fast Fourier Transform to analyze the perturbation signal in the output signal of the modulator, and realizes the fast locking and stable control of the four bias points of NULL, QUAD+, QUAD-, and PEAK by analyzing the change of the ratio of the fundamental waveform amplitude and the second harmonic amplitude of the perturbation signal. The feasibility of the scheme is verified by building a complete hardware test platform, and in the actual test process, for the four commonly used bias points can be quickly locked and stably controlled within 3S, and a stable control effect is achieved.