Fig. 1. Experimental setup of the pulsed all-fiber Er:ZBLAN laser (upper) and inner image of the fiber connectors (lower). BP, black phosphorus; CMS, clad-mode stripper; PDMFF, power-delivering multimode fluoride fiber. The inset shows a photograph of the pulsed all-fiber Er:ZBLAN laser.

Fig. 2. (a) Typical Q-switched pulse train in 1 ms time scale. (b) RF spectrum with an SNR of 30 dB measured by a resolution bandwidth (RBW) of 0.1 kHz. (c) Q-switched pulse profile with a pulse duration of 3.42 μs.

Fig. 3. (a) Average power and pulse energy versus the launched pump power. (b) Repetition rate and pulse duration versus the launched pump power.

Fig. 4. BP Q-switched spectrum of all-fiber Er:ZBLAN laser.

Fig. 5. (a) Q-switched mode-locked pulse train at 796 mW of launched pump power in the 200 μs time scale, (b) Q-switched mode-locked pulse train at 900 mW of launched pump power in the 400 μs time scale, and (c) Q-switched mode-locked pulse train at 796 mW of launched pump power in the 1 μs time scale.

Fig. 6. (a) CW mode-locked pulse train in the millisecond time scale and (b) CW mode-locked pulse train in the nanosecond time scale. (c) Fundamental RF spectrum with an SNR of 66 dB measured by an RBW of 1 kHz. The inset is a broader RF spectrum measured by an RBW of 0.3 MHz.

Fig. 7. CW mode-locked pulse spectrum.