Berwick, M., Pannell, C.N., Russell, P.St.J. and Jackson, D.A.
Demonstration of birefringent optical fibre frequency shifter employing torsional acoustic waves
Electronics Letters, 27, (9), . (doi:10.1049/el:19910444).
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A fibre-optic frequency shifter utilising torsional acoustic waves to produce a travelling perturbation which couples the polarisation modes of a linearly birefringent optical fibre is demonstrated. The shift in optical frequency was 3.195 MHz and an optical coupling efficiency of 6% was obtained with 780mW of electrical power.
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