Ultrahigh-sensitivity low coherence otdr using Er 1+ -doped high-power superfluorescent fibre source

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Abstract
The first-known demonstration of an Er3+-doped superfluorescent fibre source coupled to a high-resolution OTDR based on low coherence interference (low coherence OTDR) is reported. Linearly-polarised light with 14 mW output from the source achieves a – 146dB minimum detectable reflectivity at 3 Hz bandwidth. The spatial resolution determined by spectral FWHM is 28 μm for silica-based waveguides.