A Control System for the Optical-Fiber Piezoelectric Modulator of the Optical Path

摘要

The operating principle of an optical-fiber piezoelectric modulator of the optical path in all-optical-fiber interferometers is described. The control system of the optical-fiber piezoelectric modulator is composed of a controller based on a field programmable gate array, a digital-to-analog converter, an analog low-pass filter, and a power amplifier. A 4.4-m/s speed of change in the optical length of the fiber has been attained with an error of 0.1% at a modulation length of the optical path of >1 mm.