Asynchronous pulse repetition rate control in subpicosecond erbium-doped frequency-shifted feedback fibre lasers

Summary form only given. Recent reports, on frequency shifted feedback (FSF) lasers, have demonstrated stable pulse operation at fundamental cavity frequency. Such lasers also supported higher-order stable pulses with a repetition rate that in general is asynchronous with the cavity round-trip time. Here we demonstrate the modified concept of asynchronous pulse timing control in FSF lasers that combines continuous sliding of the laser frequency with pulse trapping.