Abstract
A "fiber optic cable tester" of 658 nm wavelength has been used to launch a linearly polarized light to the twisted single mode optical fiber of the designed mega-ampere current measurement probe. Modulated intensity variation of light has been converted to the corresponding electrical signal using a fast photodetector assembly having 100 nS rise-time. The effect of undesired linear birefringence has been overcome by manually twisting the fiber at a twist rate of 40 twists per meter. The sensitivity of the designed probe is 0.247° polarization rotation/kA current-turn product, for a single optical fiber loop.
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