We demonstrate passive mode-locking of a Bi-doped fiber laser using a nanotube-based saturable absorber. We achieve stable mode-locking in both the all-normal and net anomalous dispersion regimes. Near transform-limited 4.7 ps soliton pulses are generated in the average-soliton regime, with a chirped fiber Bragg grating used for dispersion compensation to retain an all-fiber format.
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Kelleher et al. (2010) studied this question.
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