Tunable femtosecond soliton generation in Ge-doped fibre

In contrast to conventional polarisation maintaining fibres, a simple Ge-doped singlemode fibre is used to generate tunable femtosecond soliton pulses. Soliton self-wavelength-shift up to 200 nm is achieved in a 17 m-long fibre. The generated ʹmonocolouredʹ soliton pulses have quasi-ideal sech/sup 2/ spectral shapes.