Fig. 1. (a) Experimental setup of IBML TDFL with a simple linear cavity, (b) optical reflection spectrum of the 1983 nm FBG, (c) RF spectrum of 793 nm laser and (d) oscilloscope trace of 793 nm laser.

Fig. 2. The average output power of TDFLs versus pump power with laser output ratios of 10%, 50% and 90%, respectively.

Fig. 3. Optical spectrum of the IBML TDFL with 90% output ratio.

Fig. 4. The output pulse trains of IBML TDFL with 90% output ratio: (a) $200~\text{ns}/\text{div}$, (b) $10~\text{ns}/\text{div}$ and (c) $2~\unicode[STIX]{x03BC}\text{s}/\text{div}$.

Fig. 5. (a) RF spectrum of IBML TDFL with 90% output ratio and (b) broadband RF spectrum.

Fig. 6. The single pulse energy of IBML TDFL with laser output ratio of 90% versus pump power.