A novel actively modelocked fibre ring laser based on cross-gain modulation in a semiconductor optical amplifier employed as both the gain medium and modelocking element has been demonstrated. Stable uniform pulse trains with pulse-widths about 21 ps at 5 GHz repetition frequency were obtained. The entire laser was operated in the optical domain with a large tuning range that could probably span the whole gain region of the gain medium employed.
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He et al. (2002) studied this question.