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We present an experimental verification of the theoretical scaling relationship of the spectral components that are a characteristic of instability in fiber soliton lasers and are dominant when the system length is comparable with the related soliton length.

good as phase and amplitude instrumentation. The far-field cuts shown in Fig. 4 confirm these findings. Similar agreement has also been obtained for the crosspolar patterns.

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We report what is to our knowledge the first femtosecond pulse generation at 1.3 micro m in a Pr 3(+)-doped fluoride fiber laser. After optimization of the cavity length and dispersion, the laser generated pulses as short as 620 fs. We also describe self-stabilization and self-organization of the output pulse train at repetition rates from the fundamental cavity frequency of 700 kHz up to 440 MHz and report on polarization effects.