Impact of feedback bandwidth on Raman random fiber laser remote-sensing

Abstract

In the ultra-long distance sensing domain, recently Raman random fiber laser (RRFL) demonstrated advantages of ultrawide sensing-bandwidth in dynamic sensing, compared with pulse-probing cases. However, such a scheme is still in the preliminary stage, and the key parameters such as sensitivity have not been characterized. In this work, a time-dependent spectrum-balanced model is proposed, which can accurately and quickly describe the spectral shape of RRFL and the evolution of the power and the spectrum. Based on this model, the relationship between the sensitivity and the feedback bandwidth is studied. The calculated results show that the sensitivity is inversely proportional to the feedback bandwidth. Then in the proof-of-concept experiment, by changing the bandwidth of sensing FBG, the results of sensitivity are well coincident with the simulation. This work provides an effective platform for studying the evolution of RRFL spectrum, as well as a novel way for further enhancing the performance of the dynamic sensing system based on ultra-long RRFL.

Spectral Manipulations of Random Fiber Lasers: Principles, Characteristics, and Applications

“…Recently, to describe the spectral shape and evolution of RRFLs, a time-dependent spectrum-balanced model was presented in ref. [78] as…”

“…Recently, to describe the spectral shape and evolution of RRFLs, a time‐dependent spectrum‐balanced model was presented in ref. [78] as $$$$\begin{equation}\left\{ \def\eqcellsep{&}\begin{array}{l} \displaystyle\frac{{dP_p^ \pm }}{{dz}} \pm \frac{1}{{{\nu _g}}}\frac{{P_p^ \pm }}{{dt}} = \mp {\alpha _p}P_p^ \pm \mp {g_R}\frac{{{f_p}}}{{{f_s}}}P_p^ \pm \left( {P_p^ + + P_p^ - + {\Gamma _p}} \right) \pm {\varepsilon _p}P_p^ \mp \\ [12pt] \displaystyl...$$…”

Review of Random Fiber Lasers for Optical Fiber Sensors

“…Since RFL was proposed, many researchers have explored the physical mechanism, output characteristics, and implementation methods of RFL. RFL has been well applied in fields such as supercontinuum spectroscopy [17][18][19][20], speckle free imaging [21][22][23][24][25][26], fiber communication [27][28][29][30][31][32][33][34][35][36], and fiber sensing [37][38][39][40][41][42][43][44][45][46][47][48][49][50]. Especially in the field of fiber optic sensing, RFL exhibits significant advantages in fiber optic sensing systems due to its simple structure, narrow linewidth, and low noise.…”

Observation of the photonic Hall effect and photonic magnetoresistance in random lasers

“…RLs are a prime example of a complex physical system and a key focal point for multidisciplinary research. RLs have attracted extensive research interest from researchers in materials science 13 , physics 14 , sensing 15 , biomedicine 16 , optical communication 17 , and other fields. From an application standpoint, the inherent randomness of RLs stands out as a rare embodiment of true randomness 18 , garnering significant interest in fields such as encryption 17 and time-domain ghost imaging 12 .…”