Fig. 1. Configuration of ANDi passively mode-locked Yb-doped fiber cavity with Sagnac loop as spectral filter

Fig. 2. Sagnac loop based on polarization maintaining fiber. (a) Structure; (b) transmitted spectrum

Fig. 3. Output characteristics of double pulse dissipative soliton laser. (a) Output spectrum and corresponding transmitted spectrum of Sagnac loop; (b) mode-locked pulse sequence, the illustration is the enlarge view of double pulse solitons; (c) radio-frequency spectrum with bandwidth of 175 kHz; (d) radio-frequency spectrum with bandwidth of 100 MHz

Fig. 4. Tunable output spectra of double pulse dissipative solitons under different polarization states of Sagnac loop

Fig. 5. Output pulse evolution processes under different pump powers. (a) 520 mW; (b) 330 mW; (c) 515 mW