We demonstrated a robust Watt-level mid-infrared supercontinuum (MIR-SC) source from 2 to 6.5 μm in an all-fiber structured cascade infrared transmission system. In combination with an optimized ZrF4-BaF2-LaF3-AlF3-NaF (ZBLAN) fiber-based high-power MIR-SC source and an advanced fiber coupling system, we achieved a SC with 30 dB spectral bandwidth spanning from 2000 to 6500 nm SC, with an output power scaled up to 1.13 W in a segment of 4- meter-long As2S3 fiber. And the maximum output power of 1.28W was achieved in a segment of 2-meter-long As2S3 fiber. To the best of our knowledge, this is the first report of an all-fiber supercontinuum based on commercial As2S3 step-index fiber with both watt-level output power and systematically investigation of the output characteristics. And in the meantime, we provided a feasible idea for fiber coupling under high power condition.
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