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Measurement of low frequency electric field using Ti:LiNbO3 optical modulator

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3 Author(s)
Choi, Y.-K. ; Dept. of Electron., Kyoto Univ., Japan ; Sanagi, M. ; Nakajima, M.

8 The use of an asymmetric Mach-Zehnder interferometric amplitude modulator to measure a relatively low frequency electric field strength is described. The sensitivity of an electric field sensor using a Ti:LiNbO3 optical modulator is strongly affected by the electrode shape (probe antenna). To measure the low frequency electric field, a probe antenna of wide effective area is more useful than the usual dipole antenna. As proof of this, the optical modulator was fabricated with a plate-type probe antenna and the usefulness of this antenna tested for measuring low frequency electric field strength. Measurements were performed in the range 0.1 V/cm to 60 V/cm at 60 Hz through 100 kHz. Using a probe antenna of 10 mm×10 mm, the output voltage of 1o-2 mV was measured with respect to the electric field strength of 0.1 V/cm at 60 Hz. By increasing the effective area of the probe antenna, better sensitivity was obtained over the measured range

Published in:

Optoelectronics, IEE Proceedings J  (Volume:140 ,  Issue: 2 )

Date of Publication:

Apr 1993

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