Improving Design Method for Sensitivity and Frequency Response of E-Field Sensor Using a Mach-Zehnder Interferometer

Kimihiro TAJIMA  Ryuichi KOBAYASHI  Nobuo KUWABARA  Masamitsu TOKUDA  

IEICE TRANSACTIONS on Electronics   Vol.E83-C   No.3   pp.347-354
Publication Date: 2000/03/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Optical Fiber Sensors)
Category: Sensors for Electromagnetic Phenomena
electric field sensor,  antenna measurement,  optical modulator,  electro-optical effect,  EMC,  

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The design method for sensitivity and frequency response of an electric field sensor using a Mach-Zehnder interferometer (an optical E-field sensor) has been developed in order to measure electromagnetic environments and the performance of measuring facilities. The designs of the optical modulator, sensor elements, and sensitivity were analyzed theoretically by using an accurate equivalent circuit of the sensor. Then an actual sensor was fabricated, and its characteristics of the sensor were evaluated experimentally. The results show that the designed sensitivity and frequency response were optimal. The optical output deviation when the temperature increased from 0 to 40 was reduced to within 2 dB. The minimum detectable electric field strength was 17 dBµV/m (8 µV/m), and the dynamic range was more than 100 dB. The frequency response of the sensitivity was almost flat between 200 Hz and 900 MHz.