Tunable passively Q-switched ultranarrow linewidth erbium-doped fiber laser

M. Z. Zulkifli, F. D. Muhammad, M. F. Mohd Azri, M. K. Mohd Yusof, K. Z. Hamdan, S. A. Samsudin, M. Yasin

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


A tunable passively Q-switched erbium-doped fiber laser with ultranarrow linewidth is proposed and demonstrated. With the single wall carbon nanotubes (SWCNTs) as the passive Q-switch, the ultranarrow linewidth laser operation is realized based on spectral filtering effect. using an ultranarrow tunable bandpass filter (UNTBF). The Q-switched laser spectrum is tunable from 1525 to 1561 nm, covering a wavelength range of 36 nm. At 1545 nm, the highest repetition rate of ~38 kHz and the lowest pulse width of 1.15 μs are obtained, with the corresponding pulse energy of approximately 0.18 nJ. The linewidth measurement using self-heterodyne technique yields a linewidth value of 17.5 kHz, which may be the narrowest linewidth for a Q-switched fiber laser to the best of our knowledge.

Original languageEnglish
Article number102949
JournalResults in Physics
Publication statusPublished - Mar 2020


  • Doped fiber laser
  • Passively Q-switched and erbium
  • Tunable wavelength
  • Ultra-narrow linewidth


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