Tunable Mode-locked Erbium/Ytterbium co-doped fiber laser

We proposed a tunable mode-locked fiber laser using a double-clad erbium-ytterbium co-doped fiber (DC-EYDFL). A tunable grating was used to achieve the tunability. The pulse width, repetition rate, energy and output power of the generated mode-locked pulses were 240 ns, 862 kHz 5.76 mW and 6.68 nJ at 1570 nm, respectively. The stability of the laser was observed using an RF spectrum analyzer, and the signal-to-noise ratio was more than 40 dB at the fundamental frequency of 862.4 kHz.