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A self-Q-switched mode-locked Er-doped fiber laser with 500-kHz low mode-locking repetition-rate and peculiar self-similar-like optical spectrum has been experimentally demonstrated. This new operation state may be useful for generating high-peak-power pulses from Er-doped fiber lasers.
<para> We report a method for generating versatile tunable long-period gratings (LPGs) in photonic crystal fibers (PCFs). The central wavelength and rejection bandwidth of LPGs can be tuned over a broad spectral range with adjustable transmission loss. Spectral fringes with uneven spacing are observed in chirped LPGs, depending on the interaction length and the amount of chirping between the...
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