30 W all-fiber tunable, narrowband Yb-doped superfluorescent fiber source

An all-fiber tunable, narrowband superfluorescent source is presented by using tunable seed source and two amplification stages. The output power reaches over 30 W with the tuning range of ∼35 nm (from ∼1045 to ∼1080 nm) and the slope efficiency in the final amplifier is about 67%. At the maximum output power, the full width at half maximum is about 0.7 nm and the signal-noise ratio reaches over 25 dB. More output power can be realized by simply adding pump source. To the best of our knowledge, it is the first time to use all-fiber configuration to realize the tunable output at 1 μm superfluorescent fiber source region.