| The structure of electric field sensor with segmented electrodes has been introduced by the operation principle of the optical waveguide electric field sensor and been uesed numerical analysis to analyse.And then the sensitivity and the frequency response are analyzed detailedly. The simulated results show that we can improve the structure to raise the characteristics of electric field sensor with segmented electrodes. The interval in the z direction of segmented electrodes is the smaller the better, and the interval in the y direction of segmented electrodes in the range of 10μm ~ 70μm is the bigger the better, The relation of the middle and the side of the electrode width is that when the width of side electrode is invariablenes, the width of the middle electrode is the closer to the width of the side electrode is the better; when the middle electrode's width is invariablenes, the width of the side electrode is the more the better. To definite the value of the total length and the number of segmented electrodes is need to take the frequency response bandwidth and sensitivity into account.Some fabricated optical electric field sensors with segment electrode were used to test the sensitivity, the frequency response and the linearity dynamic range. The test results and simulation results is compared to amend the the simulation results, so we can design the structure of segmented electrodes more precise to meet the different frequency response bandwidth and sensitivity. In this paper ,I have designed two more representative of the segmented electrodes. The one is able to work in the high-frequency range of 5GHz~12GHz, when the electric field frequency is 9.5GHz,the electric field sensitivity of the sensor is expected to reach 25mV / m; the other one is able to work in the low frequency range of 0 ~ 3GHz, when the electric field frequency is 1.6GHz ,the electric field sensitivity is expected to reach 3 mV / m. |
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