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Integrated Optical Waveguide Detection Technology For Electromagnetic Field

Posted on:2018-11-27Degree:MasterType:Thesis
Country:ChinaCandidate:L YangFull Text:PDF
GTID:2348330512481326Subject:Engineering
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With fast evolution of electronic technology,electromagnetic field sensor has attracted more attention,and has been widely used in various scientific fields because of advantages of small size,wide bandwidth,anti-electromagnetic,etc.This paper is based on the electro-optic effect of lithium niobate to design the electromagnetic field sensor which makes use of asymmetric MZI structures.Building the electric field sensor system for testing and the calibration of electromagnetic field sensors.Then do the nanosecond pulse response experiment.The main work is as follows:First,this paper introduces electro-optical effect of lithium niobate and the principle of integrated optical waveguide electromagnetic field sensor.As we all know,the stability of the linear operating point of the integrated optical waveguide sensor plays a very important role in the performance of the sensor.In this paper,a way of wavelength tuning is used to compensate for drift of linear operating points.Second,according to the performance requirements,this paper designs the antenna and electrode structure.The electric field sensor uses a similar structure to the conical antenna for extending the bandwidth of electric field sensor.The magnetic field sensor uses an asymmetric MZI structure and a double load loop antenna structure.Best structural parameters are obtained by simulations.Third,in this paper,a polarization maintaining device is used to connect a reflective integrated optical waveguide sensor,a laser,and a coupler for realizing one-way transmission of signals and reducing the size of the probe.Finally,this paper designs a reflective asymmetric MZI-type integrated optical waveguide field sensor based on simulation results,and puts electromagnetic field measurement system into a prototype to measure the electromagnetic field,and does the relevant test.In order to improve the sensitivity of the integrated optical waveguide electromagnetic field sensor,this paper adds EDFA to the system.The modulated light through EDFA is amplified and then accesses the photo-detector.After building the system,we test frequency response of the electric field sensor in the range of 250 k Hz ~ 400 MHz and the linearity It is worth noting that the field strength is 11.2 V/m when the frequency response of the electric sensor is tested.By the test results,we can know the frequency response of the sensor is good;moreover,the linear dynamic of this sensor is better.We set up a Gaussian pulse generator system to verify the response of the electric field sensor to the time domain pulse waveform.From the test results,we can know the electric field sensor system can more accurately reflect the source of the electric field information.This paper design a reflective asymmetric MZI-type integrated optical waveguide magnetic field sensor based on the simulation results and detect the performance of the sensor.This thesis tested the frequency response and linear dynamics of the sensor with frequency response test is from 30 MHz to 400 MHz for magnetic field sensors.The test results show that the frequency response of the sensor is relatively flat.Moreover,the linear dynamic of this sensor is better.
Keywords/Search Tags:electric field sensor, magnetic field sensor, electro-optic effect, asymmetric Mach-Zehnder Interferometer structure
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