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The Letter quantifies the role of nonlinear polarisation ellipse rotation in a modelocked Er fibre laser. The ellipse angle was observed to change by between 1 and 5 degrees when the laser made the transition from continuous wave to modelocked operation.<<ETX>>
Novel behaviour from an FM mode-locked erbium fibre laser is reported. Selfsustaining, picosecond duration pulses which are not at the modulation frequency of 480 MHz have been observed. The pulses form complex pulse trains and seem to experience soliton interactions, causing them to execute complicated motions.<<ETX>>
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