We demonstrate a sliding-frequency mode-locked (SFM) erbium fiber laser generating pulses with center wavelengths rapidly sweeping across a spectral range of . Excess optical nonlinearity in the laser cavity leads to multipulsing, with a tendency to tight pulse bunching () at the fundamental cavity frequency of . The addition of a parallel optical delay line, with a path difference equal to a rational fraction of the cavity length, distributes the pulses uniformly across the entire cavity and achieves a harmonic SFM up to . The result establishes cavity nonlinearity as a critical design parameter for picosecond wavelength-swept lasers.
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