Herein, a soliton mode-locked erbium-doped fiber laser is proposed for the 1.5-mu m region using Co3O4 as a saturable absorber (SA). Spherical Co3O4 nanoparticles (NPs) were embedded in polyvinyl alcohol to form a Co3O4-polyvinyl alcohol (PVA) film. Highly stable soliton mode-locked pulses based on the Co3O4-PVA film output were observed at 1558.86 nm with a 3 dB bandwidth, fundamental frequency, pulse width, and signal-to-noise ratio of 2.25 nm, 5.68 MHz, 1.24 ps, and 72.37 dB, respectively. Our experimental results demonstrate that the spherical Co3O4 NPs exhibited good performance in creating soliton mode-locked fiber lasers as a promising SA.
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