Acta Photonica Sinica, Volume. 54, Issue 4, 0406003(2025)
Analysis of Full-mode Acousto-optic Coupling in Stimulated Brillouin Scattering of Few-mode Fibers
Figures & Tables(13)
Fig. 3. Normalized electric field distributions of optical and acoustic modes
Fig. 4. Fitting results of acoustic modes with different acoustic normalized frequency
Fig. 6. Change of BFS，linewidth and BGS with the core radius and germanium doped concentration in few-mode optical fibers
Fig. 7. Normalized Brillouin gain spectrum with full modal coupling when core radius is 8.0 μm and 8.5 μm
Table 1. Structure and material parameters of few mode optical fibers
View tableView in ArticleTable 1. Structure and material parameters of few mode optical fibers
Parameters Values Radius of fiber core a/μm 10 Radius of fiber cladding b/μm 62.5 Refractive index of core no，core 1.463 1 Refractive index of cladding no，clad 1.458 0 Wavelength of signal light λ/μm 1.55 Acoustic velocity of core vcore/（m·s-1） 5 794.211 2 Acoustic velocity of cladding vclad/（m·s-1） 5 944 Density of core ρcore/（kg·m-3） 2 251.324 8 Density of cladding ρclad/（kg·m-3） 2 202
Table 2. Change of number of acoustic modes with different germanium doped concentrations
View tableView in ArticleTable 2. Change of number of acoustic modes with different germanium doped concentrations
Concentrations 1.5% 2.0% 2.5% 3.0% 3.5% 4.0% Va 17.532 8 20.310 1 22.780 7 25.036 1 27.130 3 29.098 6 Mode quantity 78 105 129 156 177 205
Table 3. Validation of the relationship between the number of acoustic modes and the acoustic normalized frequency
View tableView in ArticleTable 3. Validation of the relationship between the number of acoustic modes and the acoustic normalized frequency
Concentrations 4.5% 5.0% 5.5% 7.5% Va 30.965 3 32.748 2 34.460 6 40.783 6 Mode quantity 228 252 279 377 Fitting equation calculation 228 253 278 378
Table 4. Change of BFS and linewidth of each BGS with the core radius
View tableView in ArticleTable 4. Change of BFS and linewidth of each BGS with the core radius
Radius/μm 8.0 8.5 9.0 9.5 10.0 BFS/GHz 10.931 0 10.931 0 10.931 0 10.931 0 10.931 0 /MHz 40.181 8 43.545 2 44.058 4 44.177 8 43.306 8
Table 5. Change of BFS and linewidth of each BGS with germanium doped concentration
View tableView in ArticleTable 5. Change of BFS and linewidth of each BGS with germanium doped concentration
Concentrations 1.5% 2.0% 2.5% 3.0% 3.5% 4.0% BFS/GHz 11.074 0 11.039 0 11.002 0 10.966 0 10.931 0 10.895 0 /MHz 33.725 1 34.031 9 36.928 1 40.347 4 43.249 7 46.710 4
Table 6. BFS and linewidth in ten-mode optical fiber，effective acousto-optic mode coupling
View tableView in ArticleTable 6. BFS and linewidth in ten-mode optical fiber，effective acousto-optic mode coupling
Mode coupling BFS/GHz /MHz Acoustic modes Optical modes L0n LP01 10.583 0 32.314 5 LP11 10.574 0 34.560 5 LP21 10.563 0 36.179 6 LP02 10.557 0 51.871 3 LP31 10.549 0 39.344 4 LP12 10.534 0 35.791 4 LP41 10.532 0 43.480 5 LP22 10.511 0 38.252 0 LP03 10.509 0 49.408 9 LP51 10.511 0 47.979 2 L2n LP11 10.580 0 32.486 3 LP12 10.579 0 67.745 7 L4n LP21 10.577 0 32.232 0 LP22 10.583 0 80.835 9 L6n LP31 10.576 0 32.032 9 L8n LP41 10.576 0 32.048 2 L10n LP51 10.576 0 32.065 6 Total 10.577 0 71.523 1
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Ziming HUA, Lijuan ZHAO, Zhiyuan XIE, Zhiniu XU. Analysis of Full-mode Acousto-optic Coupling in Stimulated Brillouin Scattering of Few-mode Fibers[J]. Acta Photonica Sinica, 2025, 54(4): 0406003
Paper Information
Category: Fiber Optics and Optical Communications
Received: Sep. 27, 2024
Accepted: Dec. 27, 2024
Published Online: May. 15, 2025
The Author Email: Lijuan ZHAO (hdzlj@126.com)
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