A vinylidene fluoride‐tetrafluoroethylene copolymer jacket, 120 mgr;m thick, was melt extruded on single‐mode optical fibers, 80 mgr;m diam. The jacket was made piezoactive by poling radially. The performance of the fiber as an optical phase modulator was demonstrated over a wide frequency range, from 300 Hz to 2.5 MHz. A phase shift of 0.03 rad per volt per meter of fiber was measured in the low frequency (axially unconstrained) region, and 0.01 rad/V/m in the high frequency (axially constrained) region. A theoretical model was developed, relating the phase shift in the fiber to the elastic and piezoelectric porperties of the jacket material.
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