Four-port fibre frequency-shifter with a null taper coupler

Birks, T.A., Farwell, S.G., Russell, P.St.J. and Pannell, C.N. (1994) Four-port fibre frequency-shifter with a null taper coupler Optics Letters, 19, (23), pp. 1964-1966. (doi:10.1364/OL.19.001964).


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A prototype of a new design of fiber frequency shifter, based on a special four-port fused taper coupler with a null maximum coupling ratio, is reported. In this coupler the constituent fibers are so dissimilar that the maximum coupling is (ideally) zero. In the presence of a flexural acoustic wave, light is coupled between the fibers, acquiring a frequency shift in the process. Near 100% conversion with 30-dB sideband and carrier suppression is achieved, in an unoptimized device, for just 1 mW of electrical drive power.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1364/OL.19.001964
ISSNs: 0146-9592 (print)
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ePrint ID: 78246
Date :
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Date Deposited: 11 Mar 2010
Last Modified: 18 Apr 2017 20:23
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