Abstract
We report the observation of rectangular shape spectrum in passivelymode-locked fibre laser with positive dispersion cavity. The spectrumis broad and flat, and 3 dB bandwidth can be up to 17.61 nm.Multiple-pulse operation is observed in our laser system. The spectrumwidth, pulse energy, pulse width and peak power of the mode-lockedlaser output change with the appearance of multiple-pulse operation.
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