Double-pass configured fibre Mach-Zehnder interferometric optical filter for distributed fibre sensing

Abstract

A double-pass configured all-fibre Mach-Zehnder interferometric optical filter has been developed and used in a distributed fibre-optic sensor for separation of Rayleigh and Brillouin signals. Its superior performance over a single-pass all-fibre Mach-Zehnder interferometer is highlighted by its 15dB improved rejection of the Rayleigh signal and comparable throughput.

Electronics Letters (1997) Vol.33(25) pp.2148-2149

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