Research On Sensing Characteristics Of Optical Fiber Interferometer Based On ITO Material Modification

With the rapid development of modern information society,people have higher and higher requirements for communication speed and quality.As the basic devices of photoelectric network and detection,optical fiber modulator and sensor have become the primary research topics.In order to solve this goal,this Master’s thesis studied and prepared two low-cost ITO integrated optical fiber interference devices,which can realize the modulation function and sensing function well.It has great application prospects in the fields of optical modulation,biosensing and battery electrode surface monitoring.The main work contents are as follows:The development status of optical fiber modulation technology and optical fiber sensing technology is summarized.On this basis,the theory of optical fiber waveguide and optical fiber transmission are expounded.The theory of optical fiber M-Z interferometer and optical fiber FP interferometer selected in this Master’s thesis is derived.Finally,the theoretical mechanism of the classical double layer is expounded.It provides a theoretical basis for the research on the sensing characteristics of fiber optic interference devices modified by ITO.The preparation and application of large bias misaligned fused fiber MZ-ITO modulator are introduced.The optical transmission of the device is analyzed by simulation.The optimal transverse bias distance,interference arm length and ITO film thickness were determined.The preparation method of the modulator is studied in detail.The modulator is demonstrated by experiments,and the modulation performance is analyzed.By applying voltage,it is measured that the modulator has a high spectral shift efficiency.The stability of the modulator is tested.And the rising edge time and falling edge time of the modulator.The FP-ITO sensor with large bias dislocation welding is proposed,and its preparation and application in two practical situations are introduced.The optical path of the device is analyzed by simulation,and the optimum length of the interference cavity is obtained.The measurement of the conductivity of electrolyte solution by FP-ITO sensor of dislocation fused fiber was studied by experiment,and the principle of the measurement of the conductivity of electrolyte solution was analyzed.The maximum sensitivity was obtained by testing.It has good stability,periodicity and fast response time.The application of FP-ITO photoelectrode to optical and electrochemical sensing was studied.Cyclic voltammetry shows that the device can monitor the electrochemical behavior in the electrochemical reaction cell.The variation of the light intensity with the potential at the wavelength of 1550 nm was further studied,and the good periodicity of the light intensity with the cyclic voltammetry was obtained.Finally,the effect of multiple use of the device is studied by chronocurrent method,and good stability and repeatability of the photoelectrode are obtained successfully.Through the above research,the possibility of integrating ITO with fiber optic interferometers for modulation sensing technology has been confirmed,providing new ideas for the integration of new materials and fibers,as well as the development of fiber optic sensing technology.