Research On Compensation Mechanism Of Optical Sensor Based On AMZI

With the rapid development of optical sensing,optical sensors have attracted more and more attention.It has a good application prospect in marine exploration,medical health,environmental monitoring,industrial production,national defense and security and other fields,and it is very important significance for the real-time sensing and monitoring of sensing information.However,the optical sensor still has many limitations,such as the shift of light source wavelength,ambient temperature and other parameters,which has a great impact on the accuracy of the sensing results.Therefore,it is necessary to compensate for the shift of these parameters.In this thesis,the optical sensor based on asymmetric Mach-Zehnder interferometer(AMZI)is compensated.A cascaded dual AMZIs compensation structure is designed to compensate for wavelength shift,temperature shift and both shift.One AMZI is the sensing AMZI,and the other is the compensating AMZI.The influence of different shift mechanisms on optical sensor sensing are studied,and a method for quickly and accurately optimizing the compensation structure parameters is summarized.Better compensation results can be obtained by optimizing the parameters of compensation structure.The main research contents of the thesis are as follows:(1)The wavelength shift of optical sensor is compensated through the designed cascade double AMZI compensation structure.The influence of wavelength shift on the optical sensor based on AMZI structure is analyzed.The structural parameters of the two AMZI are adjusted,including their power division ratio,coupling ratio and arm length difference,and the influence on the sensor error after the compensation is analyzed.The parameters of the compensation structure can be quickly obtained through the optimization method of structure parameters.The optical sensors based on silicon dioxide,lithium niobate and silicon waveguide materials are respectively compensated for wavelength shift,and the sensing error is reduced by two-three orders of magnitude.The fabrication tolerance is analyzed.(2)The temperature shift of the optical sensor is compensated through the designed cascade double AMZI compensation structure.The influence of temperature shift on the optical sensor based on AMZI structure is analyzed,and the influence of adjusting the structure parameters of two AMZIs on the sensor error after compensation is analyzed.The structure parameter optimization method is used to quickly obtain the parameters that can well compensate the temperature shift.In this paper,the temperature shift compensation of the optical sensor based on silicon dioxide and silicon is performed,and the sensing error is reduced by more than two orders of magnitude,and the fabrication tolerance is analyzed.(3)On the basis of separate compensation for wavelength shift and temperature shift,the both wavelength and temperature shift of the optical sensor are compensated simultaneously through the designed cascaded double AMZI compensation structure.The influence of the simultaneous shift of wavelength and temperature on the optical sensor based on AMZI structure is analyzed,and the influence of adjusting the parameters of two AMZIs on the sensor error after compensation is analyzed.Through the structural parameter optimization method,the parameter of the wavelength and temperature compensation are quickly obtained.The optical sensor based on silicon dioxide and silicon are respectively compensated for the wavelength and temperature shift at the same time.The results show that the sensing error is significantly reduced by two orders of magnitude,and analyze the fabrication tolerance.This cascade structure compensation mechanism is not limited to compensating AMZI-based optical sensors,but can compensate for interference-type optical devices.Taking the optical sensor based on AMZI as an example,a cascaded dual AMZI compensation structure is designed to compensate the wavelength shift,temperature shift and both shifts of the optical sensor,which has obvious effects,greatly reduces the sensing error,and improves the sensing accuracy.It is of great value and significance when applied to reduce the cost of the sensing system and improve the sensing performance.