Circularly birefringent fibers have several important potential applications in coherent detection schemes and as the sensing fiber in electric-current monitors1 and magnetic-field detectors. Recently we reported2 a novel fiber based on the rotation of the polarization state which occurs when light is constrained to follow a helical path. Fibers fabricated with helical cores have already exhibited circular birefringence, which is an order of magnitude higher than has been obtained previously by twisting the fiber.

© 1986 Optical Society of America

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