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
(130.3120) Integrated optics : Integrated optics devices
(130.3730) Integrated optics : Lithium niobate
(230.2090) Optical devices : Electro-optical devices
(280.4788) Remote sensing and sensors : Optical sensing and sensors
(130.4110) Integrated optics : Modulators
Original Manuscript: October 4, 2011
Revised Manuscript: January 26, 2012
Manuscript Accepted: February 13, 2012
Published: March 25, 2012
Hong-Sik Jung, "Electro-optic Electric Field Sensor Utilizing Ti:LiNbO3 Symmetric Mach-Zehnder Interferometers," J. Opt. Soc. Korea 16, 47-52 (2012)
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