Culverhouse, D.O., Yun, S.H., Richardson, D.J., Birks, T.A., Farwell, S.G. and Russell, P.St.J.
Low loss all-fibre acousto-optic tunable filter
Optics Letters, 22, (2), . (doi:10.1364/OL.22.000096).
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We report significant advances in the development of simple all-fiber, tunable acousto-optic spectral filters based on null couplers. Close to ideal device performance characteristics have been obtained for the first time through improved control of the coupler uniformity. Furthermore, using a double pass arrangement, we demonstrate filter bandwidth reduction and improved side-lobe suppression of -20dB. The double pass configuration is also shown to double the frequency shifts obtainable from such devices
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