All-fiber acoustooptic phase modulators using zinc oxide films on glass fiber

Experiments with an acoustooptic phase modulator for single-mode optical fibers are described. The device, which operates in the 500-MHz frequency range, uses a zinc oxide transducer sputter-deposited on top of a gold film evaporated on the fiber. The device is heat cooled and partially acoustically terminated by gallium, which is also used as the top electrode of the transducer. The maximum modulation observed on a 2-mm length of fiber is 2 rad with an input power of 2 W.<
>