Generation of dissipative soliton resonance with reverse saturable absorption in anomalous-dispersion fiber lasers

In this work, we experimentally investigate the generation of dissipative soliton resonance (DSR) pulses in the anomalous dispersion regime, enabled by the reverse saturable absorption (RSA) effect. The RSA effect is achieved by tailoring the saturable absorption characteristics of a single-walled carbon nanotube-polyvinyl alcohol composite film. Our findings indicate that a strong RSA effect can suppress spectral broadening and prevent pulse breakup in a high-gain cavity, facilitating the formation of DSR pulses. At a central wavelength of 1560.3 nm, we obtain rectangular pulses with durations ranging from 0.74 ns to 3.4 ns, achieving a single-pulse energy of 0.139 nJ. Additionally, our results show that the peak power of DSR pulses increases with the saturation power, consistent with observations in the normal dispersion regime. This study highlights the crucial role of the RSA effect in carbon nanotube films for generating DSR pulses, offering valuable insights for the development of high-performance carbon-based fiber lasers.