Output Characterization of Random Fiber Laser Formed by Dispersion Compensated Fiber

Abstract

Random lasing (RL) characteristics of second-order random fiber laser formed solo by dispersion compensated fiber are studied. It is found that the threshold of first-order RL is only 0.45 W. In addition, a special route to stable second-order lasing is revealed, i.e., a special arc-shape output spectrum of secondorder RL and three chaotic regimes during evolution from the first RL to the second-order one with increased pump power.

Open Cavity Hybrid Raman-Erbium Random Fiber Laser With Common Pump

“…Prolonged chaotic regime nonconforming of previously reported random fiber lasers is observed. Finally, the proposed scheme also confirms the behavior demonstrated by the hybrid laser reported in [12], where higher order Raman Stokes was suppressed at high pump powers.…”

“…At 4.34 W, a smooth stable laser at 1567 nm is observed with complete attenuation of 2nd order Raman Stokes (R3). The suppression of the 2nd order Raman Stokes emission at higher pump powers was also observed in [12], which is attributed to the complex nonlinear effects broadening the 1st order Stokes signal. Thus, the threshold generation of the 2nd order Stokes is raised and leads to the diminished emission in the 2nd order Stokes region.…”

“…This configuration achieves random lasing through hybrid amplification from SRS effect and EDF gain, assisted by RS feedback. Our proposed hybrid random fiber laser setup yields comparable threshold conditions but with higher slope efficiency and higher output power generation relative to other hybrid configurations [9], [12], [14]- [17]. The proposed HRFL is an attractive configuration as it simply needs a single pump to sustain the laser system without requiring any physical reflectors or ring cavities, thus simplifying the laser scheme.…”

“…Not only that, the components within the laser is expected to be durable at very high optical power, heightening the total cost of the system. For this reason, hybrid random fiber laser was introduced [8]- [19] with the concept revolving around the fundamentals of RS-based distributed feedback but with additional characteristics from the integration of specialty fibers such as single-mode fiber (SMF) with embedded gratings [8], dispersion compensating fiber [9], [12] erbium-doped fiber (EDF) [13]- [21], ring cavity [10], and Fabry-Perot cavity [11] into the laser schemes. In comparison to non-hybrid random fiber lasers, some hybrid lasers exhibit enormous reduction in the lasing thresholds accompanied with narrow linewidth [20].…”

“…In comparison to non-hybrid random fiber lasers, some hybrid lasers exhibit enormous reduction in the lasing thresholds accompanied with narrow linewidth [20]. The generation of higher order Raman emission was also possible at lower pump powers [9], [12]. However, prior reported hybrid schemes often used the approach of employing erbium gain [14], [15] and/or stimulated Brillouin scattering (SBS) [17], [18] instead of SRS as the gain mechanism, to lower the threshold condition.…”