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<p>In this paper, we have demonstrated the generation of narrow spectral bandwidth pulse based on the chirped fiber Bragg grating (CFBG) and nonlinear polarization rotation (NPR) effects. Two CFBGs with different bandwidths are introduced into the laser system, respectively, to provide spectral filtering, which not only guarantee the output of the ultrafast solitons with narrow spectral bandwidth, but also allows the wavelength tunability. For the CFBG with 15&#xa0;nm bandwidth, stable pulses with a pulse duration of around 10 ps and a narrow 3 dB spectral bandwidth of 0.4 ~ 0.6&#xa0;nm are generated. Moreover, the wavelength of the narrow bandwidth pulses can be tuned from 1548.20&#xa0;nm to 1556.60&#xa0;nm by adjusting the PC. For the CFBG with 5&#xa0;nm bandwidth, the narrowest bandwidth of 0.29&#xa0;nm is achieved. Our researches provide a simple setup and method to obtain wavelength-tunable narrow bandwidth pulse outputs, showing the potential to meet various requirements of ultrafast laser applications.</p>

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Wavelength tunable narrow bandwidth mode-locked fiber laser based on CFBG

  • 期刊论文

  • 发表日期：

    2025年12月8日

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  • Dan Qi,
  • Lei Sun,
  • Xiaoying Wang,
  • Xinyu Zhang,
  • Zhaokun Wang

摘要

In this paper, we have demonstrated the generation of narrow spectral bandwidth pulse based on the chirped fiber Bragg grating (CFBG) and nonlinear polarization rotation (NPR) effects. Two CFBGs with different bandwidths are introduced into the laser system, respectively, to provide spectral filtering, which not only guarantee the output of the ultrafast solitons with narrow spectral bandwidth, but also allows the wavelength tunability. For the CFBG with 15 nm bandwidth, stable pulses with a pulse duration of around 10 ps and a narrow 3 dB spectral bandwidth of 0.4 ~ 0.6 nm are generated. Moreover, the wavelength of the narrow bandwidth pulses can be tuned from 1548.20 nm to 1556.60 nm by adjusting the PC. For the CFBG with 5 nm bandwidth, the narrowest bandwidth of 0.29 nm is achieved. Our researches provide a simple setup and method to obtain wavelength-tunable narrow bandwidth pulse outputs, showing the potential to meet various requirements of ultrafast laser applications.