Four-port fiber frequency shifter with a null taper coupler
- 1 December 1994
- journal article
- Published by Optica Publishing Group in Optics Letters
- Vol. 19 (23) , 1964-1966
- https://doi.org/10.1364/ol.19.001964
Abstract
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.Keywords
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