The use of a Ti:LiNbO<sub>3</sub> symmetric Mach-Zehnder interferometric
intensity modulator with a push-pull lumped electrode and a plate-type probe antenna
to measure an electric field strength is described. The modulator has a small device
size of 46×7×1 and operates at a wavelength of
1.3 μm. The output characteristic of the interferometer
shows the modulation depth of 100% and 75%, and Vπ
voltage of 6.6 V, and 6.6 V at the 200 Hz and 1 KHz, respectively. The minimum
detectable electric field is ~1.84 V/m, ~3.28 V/m, and ~11.6 V/m, corresponding to a
dynamic range of about ~22 dB, ~17 dB, and ~6 dB at frequencies of 500 KHz, 1 MHz
and 5 MHz, respectively.
© 2012 Optical Society of Korea
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