Modulation instability and soliton-Raman generation in P/sub 2/O/sub 5/ doped silica fiber

Generation of high-repetition-rate modulation instability pulse trains and high- energy soliton-Raman pulses of approximately=60 fs durations, in a single-mode P/sub 2/O/sub 5/-doped silica fiber, is reported. The 7 mol.% concentration P/sub 2/O/sub 5/ fiber was pumped in a single pass arrangement by a Q-switched and mode-locked Nd:YAG laser operated at 1.319 mu m. Operating in the region of zero second-order dispersion, modulation instability Stokes sideband seeded resonantly cascade stimulated Raman scattering associated with Si-O-Si and P=0 vibration modes of the fiber. As a result, broad bandwidth and widely tunable 1.36-1.80 mu m femtosecond pulses were obtained.<
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