Fabrication and characterization of a retroreflective type of practical LiNbO3 voltage sensor operating in the range of 6 Hz to 2 GHz

This paper reports the performance of an AC-voltage sensor with a LiNbO3 in tegrated retroreflective structure based on the Y-junction Mach-Zehnder int erferometer. This structure is capable of realizing a low-cost sensor chip because of the small chip size and single optical-fiber connection. In the sensitivity and frequency response evaluation, detection sensitivities of 6 .3 mu V/root Hz have been measured with a frequency response from 6 Hz to 2 GHz. These measurement limitations were also analyzed theoretically and co mpared with the experimental results. This unique sensor enables precise vo ltage measurement in an EMI environment, even inside a computer.