Passive harmonically mode-locked fiber ring laser with scalable repetition rate up to 1.2 GHz has been experimentally demonstrated. Two types of stabilization mechanisms for passive harmonic mode-locking are identified at different repetition rates. Through investigating the dynamics of pulse generation, it is found that a new operation mode, harmonic mode-locking of multipulse bunching, favors higher order harmonic. The supermode suppression rates of harmonically mode-locked pulse trains at 439 MHz and 1.145 GHz are 40 dB and 30 dB, respectively.
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Zhang et al. (2007) studied this question.
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