Over 10‐W, 2.0‐μm, Broadband, All‐Fiber Amplified Spontaneous Emission Source Based on Spectrum Combination

Herein, Tm‐doped fiber (TDF) amplified spontaneous emission (ASE) and Ho‐doped fiber ASE to realize a high‐power, 2.0‐μm‐broadband, all‐fiber ASE source are combined. By in‐band pumping the Ho‐doped fiber ASE with TDF ASE, an output power of 17.7 W is achieved. Subsequently, a 1500–1970/1980–2200‐nm wavelength division multiplexer is utilized to combine the Tm‐doped and Ho‐doped fiber ASE sources. The combined ASE source exhibits a maximum output power of 10.9 W, a full width at half maximum of 67 nm, a spectral range of 1910–2086 nm, a root–mean–square power fluctuation of 0.17% in 30 min, no self‐pulsing, and no self‐excited oscillation. To the best of knowledge, such a high output power has not been previously reported for Ho‐doped fiber ASE sources and 2.0‐μm‐broadband all‐fiber ASE sources. Thus, spectrum combination can effectively yield a high‐power fiber ASE source with a broad bandwidth.