Research On Key Technologies Of Electric Field Sensors Based On Asymmetric M-Z Interferometer

Since the beginning of the 21st century,with the continuous development of the information industry,the impact of electromagnetic fields has received more and more attention,and the measurement of electromagnetic fields is particularly important.As one of many electric field sensors,the integrated optical waveguide electric field sensor is widely used in defense,power,communications and other industries due to its advantages of wide operating bandwidth,small physical size,and low interference to the measured electric field.Therefore,the research work of integrated optical waveguide electric field sensor is of great significance.In this paper,the research work of LN integrated Mach-Zender Interferometer?MZI?optical waveguide electric field sensor is carried out based on Li-NbO₃?LN?material with x-cut y transmission.Firstly,this paper introduces the research background,research status and significance of LN integrated MZI optical waveguide electric field sensor.at the same time,it briefly introduces the main content and chapter arrangement of this paper.Then the working principle of the sensor is deduced theoretically,and the performance index of the sensor is introduced.Finally,the sensor is designed on the basis of theoretical analysis and simulation,and the performance of the sensor is tested.The main research results of this article are as follows:1.Design an integrated MZI straight-through electric field sensor based on bulk LN materialThrough theoretical analysis and CST STUDIO SUITE numerical simulation,a straight-through electric field sensor with array conical dipole antenna structure is designed.Its characteristic is that the sensitivity of the sensor is improved by the antenna with array structure.Build an electric field sensing experiment system to test the performance of straight-through electric field sensors.The continuous wave test results show that the minimum measurable electric field of the sensor is 0.12V/m,and the maximum measurable electric field is 82V/m.The frequency response fluctuation of the sensor in 0.1GHz²GHz is±4.4dB,and the frequency response fluctuation in 2⁶GHz and 6GHz¹8GHz is±5.75dB and±17dB respectively.2.Design an integrated MZI reflective electric field sensor based on bulk LN materialThrough theoretical analysis and CST STUDIO SUITE numerical simulation,a reflective electric field sensor with a single cone dipole antenna structure is designed,which is characterized by a small physical size and a better frequency response before the antenna resonance point.An electric field sensing experiment system was built,and the performance test of the electric field sensor was carried out.Continuous wave test results show that the minimum measurable electric field of the sensor is 0.15V/m,and the maximum measurable electric field is 22.5V/m.The frequency response fluctuation of the sensor in 0.1GHz²GHz is±2.7dB,and the frequency response fluctuation in2⁶GHz and 6GHz¹8GHz is±2dB and±22dB respectively.3.LN thin film integrated MZI electric field sensor simulation work.The sensor is designed based on the LN thin film material,and a new scheme for operating point control using refractive index difference is proposed.This scheme is based on the refractive index difference generated by the two waveguide arms of MZI,and realizes operating point control through wavelength tuning.In this paper,Rsoft simulation software is used to simulate the solution,and finally the design parameters of the waveguide arm that can realize the working point control are obtained.In this paper,the CST STUDIO SUITE simulation software is used to simulate the LN film integrated MZI electric field sensor cone dipole antenna,and finally the antenna design parameters with a working bandwidth of 40 GHz and a frequency response fluctuation of±4.095 dB are obtained.