1：Experimental Design and Method Selection:

The study utilized a SnS2-PVA film as a saturable absorber in an Erbium-doped fibre laser to generate dissipative solitons. The laser operated in the near-zero dispersion regime.

2：Sample Selection and Data Sources:

The SnS2 nanosheet liquid with a density of 0.1 mg ml?1 and PVA solution (4 wt%) were mixed and spin-coated onto a glass substrate to fabricate the SA device.

3：1 mg ml?1 and PVA solution (4 wt%) were mixed and spin-coated onto a glass substrate to fabricate the SA device. List of Experimental Equipment and Materials:

3. List of Experimental Equipment and Materials: Equipment included a 980 nm laser diode, Erbium-doped fibre, wavelength division multiplexer, polarization independent isolator, optical coupler, dispersion compensating fibre, optical spectrum analyzer, oscilloscope, photodetector, RF spectrum analyzer, and auto-correlator.

4：Experimental Procedures and Operational Workflow:

The laser cavity was set up with the SnS2-PVA film as the SA. The output was measured for various pump powers to observe the mode-locking operation and pulse characteristics.

5：Data Analysis Methods:

The output spectra, pulse train, RF spectrum, and pulse duration were analyzed to confirm the generation of dissipative solitons.