The most common Er-doped fibres being used today are silica-based. However solubility limit of erbium ions in silica glass restrict shortening of the gain medium in fibre light sources and that way, it limits improving single-frequency fibre lasers, amplifiers and pulsed fibre lasers characteristics. Shortening of a fibre gain medium might be successfully realised by using high-concentration Er-doped phosphate glasses. It was shown that such type of glass allows getting rare-earth ions concentration an order of magnitude higher in comparison with silica glasses without ions clusterization [1]. But significant drawbacks of phosphate fibres are their low corrosion resistance and high losses of its fusion splices with standard silica fibres [2].

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