Narrowband position-tuned multilayer interference filter for use in single-mode-fibre systems

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Abstract
The design and construction of a position-tuned multilayer dielectric interference filter for use in the 1.25–1.30 μm wavelength range is described. Results showing a significant improvement in performance over currently available devices are reported. The performance of this filter in a single-mode to single-mode fibre component is also described with peak efficiencies >80% and Δλ½(FWHM)<13 nm.