The concept of a magneto-optic current sensor that employs a fiber-optic Fabry–Perot resonator shaped into a single-turn helix is presented. The helical shape permits construction of a compact device that has the required polarization properties. Compared with a single-pass sensor, a large increase in sensitivity is obtained as a result of the finesse of the resonator. Experimental results confirm the theory and show that for a finesse of F = 6 the sensitivity is four times larger than for a single-pass sensor.
© 1989 Optical Society of America
Original Manuscript: July 20, 1988
Manuscript Accepted: March 3, 1989
Published: June 1, 1989
F. Maystre and A. Bertholds, "Magneto-optic current sensor using a helical-fiber Fabry–Perot resonator," Opt. Lett. 14, 587-589 (1989)