Determination and Analysis of Line-Shape Induced Enhancement of Stimulated Brillouin Scattering in Noise Broadened, Narrow Linewidth, High Power Fiber Lasers

被引:5
|
作者
Vikram, B. S. [1 ]
Prakash, Roopa [1 ]
Balaswamy, V [1 ]
Supradeepa, V. R. [1 ]
机构
[1] Indian Inst Sci, Ctr Nano Sci & Engn, Bangalore 560012, Karnataka, India
来源
IEEE PHOTONICS JOURNAL | 2021年 / 13卷 / 02期
关键词
Reflection; Optical fiber polarization; Optical fiber amplifiers; Phase modulation; Optical fiber cables; White noise; Radio frequency; SBS; stimulated Brillouin scattering; phase modulation; Rayleigh scattering; white noise source; power scaling; kW-class; PHASE MODULATION; OPTICAL-FIBERS; AMPLIFIER; KILOWATT; RESOLUTION; KW;
D O I
10.1109/JPHOT.2021.3067350
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
We investigate the origin of line-shape induced enhancement of stimulated Brillouin scattering (SBS) in narrow linewidth, noise broadened, high-power fiber lasers. A polarization-maintaining seed laser with continuously tunable linewidth (single frequency to >10 GHz), based on white noise modulation was developed for this study. With increasing linewidths, a substantial difference in SBS thresholds was observed depending on the end termination utilized. This observation can be explained by the line-broadened source, having significant power in the Stokes frequency at larger linewidths, seeding the SBS process. Here, SBS threshold for the system terminated with an anti-reflection coated delivery cable is compared with a simple angle cleaved end termination. The influence of end termination on SBS threshold becomes significant with increased linewidths, showing >20% difference in output power between the two cases at similar to 10 GHz linewidth. The experiments are complemented by simulations, analyzing relative contributions of Rayleigh scattering and fiber end-facet reflections to SBS. At larger linewidths, due to substantial overlap between laser line-shape and SBS Stokes, with low end-facet reflectivity, Rayleigh is the dominant mechanism, which gives way to end-facet reflections with increasing reflectivity. The Rayleigh contribution is negligible at smaller linewidths, and end-facet reflectivity has a weaker influence than with larger linewidths.
引用
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页数:13
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