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

Abstract

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.