Single-longitudinal-mode short-cavity Brillouin random fiber laser via frequency auto-tracking with unpumped-EDF sagnac loop

Stable wavelength-swept single-frequency erbium fiber laser in L-band tuning bandwidth

“…The Ring 3 having a 5.5 m unpumped EDF is also employed to produce the mode-filter effect by using a 2 × 2 CP 1 . The EDF based saturable absorber (SA) can cause a narrow bandwidth auto-tracking filter to filter out the undesired multi-longitudinal-mode (MLM) and confine the resonant modes within a limited frequency scale simultaneously in this demonstration [13,14]. Therefore, combining the MZI, triple-ring and EDF-SA in the presented EDF laser can remove the random MLM oscillations immediately to maintain the SLM operation.…”

“…Nevertheless, because of the longer fiber length and EDF's homogeneous broadening effect, the EDF laser could result in the multiple and unstable longitudinal-mode fluctuations [9]. To mitigate the dense longitudinal-mode variations, several associated methods have been proposed, such as utilizing the Mach-Zehnder interferometer (MZI) based comb filter [10], composite-fiber-ring configuration [11,12], saturable absorber (SA) based filter [13,14] and optical feedback injection effect [2,15]. Commonly, the most of EDF lasers operated in the C-band scope from 1528 to 1562 nm.…”

Unveiling optical rogue wave behavior with temporally localized structures in Brillouin random fiber laser comb

“…To date, RFLs based on a variety of gain mechanisms including rare-earth ion-doped fiber amplifiers, 16 stimulated Brillouin scattering (SBS), 17 stimulated Raman scattering, 18 , 19 and semiconductor optical amplifiers 20 have been reported. By employing regulating and control technologies combined with different gain mechanisms, performances of the reported RFLs have been well improved in many aspects, especially in their lower threshold, 21 higher output power, 22 wavelength tunability, 23 higher coherence, 24 narrower linewidth, 25 lower noise, 26 and more stabilized output power, 27 which enables a wide range of applications for RFLs in optical measurement, 28 microwave photonics, 29 optical fiber communication, 30 optical fiber sensing, 31 laser imaging, 32 and other fields 30 , 33 . Among the above-mentioned RFLs based on different gain mechanisms, the Brillouin random fiber laser (BRFL) stands out by right of its excellent properties, such as the low threshold in long single-mode fiber (SMF), narrow gain bandwidth (∼30 to 40 MHz in standard SMF), high amplification factor, and inhomogeneous broadening gain spectrum.…”