Abstract Red-shifted dispersive waves (DWs) at the mid-infrared wavelengths are generated for the first time by pumping a photonic crystal fiber (PCF) with two zero dispersion wavelengths specially designed and fabricated in our lab, and the central wavelength of the soliton generated lies on the negative slope of the PCF dispersion profile. The experimental result shows that the conversion efficiency η of red-shifted DWs increases from 5℅ to 15℅ as the input power changes from 100 to 300 mW with the pump wavelength of 810 nm. By adjusting both the pump wavelength and power, the tunable range of the wavelength generated by red-shifted DWs can be over 100 nm.

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