20 GHz spacing multi-wavelength generation of Brillouin-Raman fiber laser in a hybrid linear cavity

Abstract

We demonstrate a tunable multi-wavelength Brillouin-Raman fiber laser with 20 GHz wavelength spacing. The setup is arranged in a linear cavity by employing 7.2 and 11 km dispersion compensating fibers (DCF) in addition to a 30 cm Bismuth-oxide erbium doped fiber. In this experiment, for the purpose of increasing the Stokes lines, it is necessary to optimize Raman pump power and Brillouin pump power together with its corresponding wavelengths. At the specific Brillouin pump wavelength, it is found that the longer length of 11 km DCF with optimized parameters results in larger number of Stokes combs and optical signal to noise ratios (OSNRs). In this case, a total of 195 Brillouin Stokes combs are produced across 28 nm bandwidth at Brillouin pump power of -2 dBm and Raman pump power of 1000 mW. In addition, all Brillouin Stokes signals exhibit an average OSNR of 26 dB.

Recent advances in fundamentals and applications of random fiber lasers

“…A combination of SBS and erbium gain can be used to obtain Brillouin comb generation in random fiber lasers [93][94][95][96]. For example, Mamdoohi et al [94] demonstrated a 28 nm span of Brillouin comb interspaced by 20 GHz in a configuration employing a span of DCF fiber, followed by a 30 cm long highly doped bismuth oxide erbium fiber. The erbium fiber was pumped by the undepleted pump from the DCF fiber, which then amplified the resulting Brillouin cascades.…”

Multi-wavelength Brillouin-Raman fiber laser utilizing enhanced nonlinear amplifying loop mirror design

“…Other parameters in Eq. (5) that include 0.05ln (10) s s α Γ = is the fiber loss coefficient at the signal wavelength and 0.05ln (10) p p α Γ = is that at the pump wavelength [18]. In the next parameter, / 2…”

“…However, the implementation of FWM and NPR techniques to initiate multiple wavelengths introduces lower stability, high cost and complexity [4,5]. Alternatively, a better solution is provided when utilizing SBS effects in various gain media [6][7][8][9][10]. Among these technologies, the Brillouin-Raman fiber laser (BRFL) has several advantages and potential applications [10][11][12].…”

“…Alternatively, a better solution is provided when utilizing SBS effects in various gain media [6][7][8][9][10]. Among these technologies, the Brillouin-Raman fiber laser (BRFL) has several advantages and potential applications [10][11][12]. These are such as wavelength stability, large gain bandwidth, and design simplicity.…”

“…In the previously reported assessments, different BRFL structures have been proposed to attain multiple wavelengths with 10 or 20 GHz spacing through linear or ring cavity oscillators [10,13]. In the scheme with 10 GHz spacing, the configuration was arranged in a linear cavity consisting of two high reflectivity mirrors.…”