Fiber amplifier for generating femtosecond pulses in single mode fiber

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A source of high-power femtosecond optical pulses comprises a combination of a relatively short rare-earth doped fiber amplifier (14) (e.g., less than five meters) with a first section of single mode fiber (12) (or other dispersive element) disposed at the input of the amplifier to "pre-chirp" the output from a femtosecond pulse source, and a second section of single mode fiber (16) fused to the output of the fiber amplifier to provide compression to the amplified pulses generated by the fiber amplifier. The rare-earth doped fiber amplifier is formed to comprise a normal dispersion, which when combined with self-phase modulation and distributed gain leads to a regime in amplifiers defined as "self-similar propagation". In this regime of operation, the fiber