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Single-frequency Er3+:Yb3+-codoped fibre amplifiers in MOPA configuration are promising candidates to fulfil the challenging requirements of laser sources operating at 1.5 μm for the third generation of interferometric gravitational wave detectors (GWDs) [1]. However, their output power is limited by amplified spontaneous emission (ASE) of the Yb3+ ions between 1.0 μm and 1.1 μm and stimulated Brillouin...