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We investigate the influence of taper geometry in Er/Yb co-doped fiber (EYDF) strain sensors using tunable abrupt-tapered Mach-Zehnder interferometers (AT-MZI). It was found that the sensitivity of the strain sensor can be enhanced by reducing both the waist diameters of, and the span between the two abrupt tapers. For strains under 0.2% in AT-MZIs with a consistent span of 10 mm, the strain-induced...
We demonstrate wavelength-tunable abrupt-tapered Mach-Zehnder interferometers (AT -MZI) with the extinction ratios of above 32 dB by introducing two points of abruptly tapering in a short length (< 1.4 cm) of highly Er/Yb co-doped fiber (EYDF). The EYDF is immersed in a micro flame where the bilateral edges of flame can provide a higher heating temperature than that of the inner portion part. Thus...
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