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Frequency shifters in which several acoustic transducers act on an optical fibre potentially offer lower power consumption and a greater choice of operating frequency than surface acoustic wave devices. A computer model is presented and maximum predicted efficiencies and sideband suppressions for various configurations are reported.<<ETX>>
An all-fibre frequency shifter operating at 3 MHz is described. The device was based on a SAW structure using interdigital transducers on a PZT4 ceramic substrate. Carrier and sideband suppression were 29 and 35 dB, respectively, with 4.5% of the input optical power shifted for an electrical drive of 2 W.<<ETX>>
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