Detachable 400-MHz acousto-optic phase modulator for a single-mode optical fiber

Abstract

A single-mode-fiber phase modulator was constructed by contacting the fiber with a lapped glass capillary tube. The capillary’s inner surface provides a long, effectively semicircular contact region to the fiber, allowing throughput of acoustic waves launched from a thin-film ZnO transducer fabricated directly onto the capillary’s other lapped face. The device operated at a center frequency of 416 MHz with a FWHM bandwidth of 14 MHz. The maximum phase shift was $0.033\text{rad}/\sqrt{\text{mW}}$, with a largest measured value of 1.2 rad at 1.3-W input electrical power.

© 1989 Optical Society of America

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