Electro-optical modulator bias voltage control system based on SoC FPGA and calibration method

Abstract

The invention, which belongs to the field of optical control, provides an electro-optical modulator bias voltage control system based on an SoC FPGA and a calibration method. The system comprises an SoC FPGA on-chip hardcore co-processing chip, a DDS sinusoidal signal generator module, a three-way linear adder, a high-precision low-ripple adjustable constant voltage source, an electro-optical modulator, a photoelectric detector, a lock-in amplifier and a DA conversion module. According to the electro-optical modulator bias voltage controller based on the SoC FPGA, the overall efficiency of thesystem is high; the cooperative processing controller based on the on-chip hardcore is flexible in structure, the operation stability and the output power precision of the electro-optical modulator are effectively improved. The electro-optical modulator bias voltage controller can be widely applied to the field of optical control research.

Description

technical field [0001] The present invention relates to the technical field of photoelectric control, and more specifically, relates to a SoC FPGA-based electro-optical modulator bias voltage control system and calibration method. Background technique [0002] In the past 30 years, photoelectric detection technology has been widely used in fields related to national economy and people's livelihood, such as medical health, food safety detection, natural environment monitoring and coherent optical fiber communication. The core of its technical application is the electro-optic modulator. However, since the material of the electro-optic modulator (Electro-Optic Modulator) is composed of lithium niobate crystal (LiNbO 3 ), gallium arsenide crystal (GaAs) and lithium tantalate crystal (LiTaO 3 ), its constituent materials are easily affected by the ambient temperature, and in the process of use, the refractive index of the crystal inside the electro-optic modulator changes with t...

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Problems solved by technology

However, since the material of the electro-optic modulator (Electro-Optic Modulator) is composed of lithium niobate crystal (LiNbO 3 ), gallium arsenide crystal (GaAs) and lithium tantalate crystal (LiTaO 3 ), its constituent materials are easily affected by the ambient temperature, and in the process of use, the refractive index of the crystal inside the electro-optic modulator changes with the electric field strength, and the error of the supply voltage causes the bias voltage of the electro-optic modulator to have a certain offset, thus reducing the modulation accuracy of the electro-optic modulator and the stability of the entire system

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