Abstract
The Brillouin frequency shifts of three types of optical fibres are measured by the heterodyne method using an electrical spectrum analyser. Owing to its excellent resolution, a change of 10 MHz in the Brillouin frequency shift, which corresponds to a change of the order of 1 nm in pump wavelength, can be easily measured. The longitudinal acoustic velocities of different fibre types can be deduced. The results also confirm that the frequency shift (10 GHz) varies inversely to the wavelength and decreases with an increase of GeO2 doping concentration.
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