Universal dynamic phase-calibration technique for fiber-optic interferometric sensors and phase modulators

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Abstract
A new technique for dynamic phase calibration that utilizes only visual observation of the fringe pattern is demonstrated for use in fiber-optic interferometric sensors and phase modulators. The need for a photodetector and its associated electronic circuitry is completely eliminated. Observations show that random changes in phase, source intensity, and fringe visibility do not affect the phase calibration. Since no phase bias or feedback is necessary, the new method is simple and fast. This technique is of universal applicability to any two-beam interferometer incorporating dynamic sinusoidal displacements.