Abstract

We report a frequency-division-multiplexed (FDM) three- channel fiber-optic low-frequency voltage sensor based on the electrostrictive effect. The high-resolution device is the first, to our knowledge, to demonstrate the measurement of three low-frequency voltage signals with a single fiber-optic interferometer and a single unmodulated laser. Measured cross talk between channels is less than −75 dB and is demonstrated to be a consequence of the nonlinear output of the interferometer for large optical phase shifts.

© 1994 Optical Society of America