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We present a high-speed wavelength tunable photonic crystal fiber-basedsource capable of generating tunable femtosecond solitons in the infraredregion. Through measurements and numerical simulation, we show that both thepulsewidth and the spectral width of the output pulses remain nearly constantover the entire tuning range from 860 to 1160 nm. This remarkable behavior isobserved even when pump pulses are heavily chirped (7400 fs^2), which allows toavoid bulky compensation optics, or the use of another fiber, for dispersioncompensation usually required by the tuning device.

High-speed tunable photonic crystal fiber-based femtosecond soliton source without dispersion pre-compensation