Pulsed random fiber laser with switchable repetition rate

We show that radiation of random fiber Raman laser can be driven into pulsed operation via self-gain-switching. The regime is characterized by small time jitter. We also experimentally demonstrate the self-gain-modulation induced pulsed operation in random fiber laser occurs with switching of repetition rate, that occurs with the increase of the pump power. We present a simple formula that describes possible repetition frequencies.