Acoustic modal analysis and control in w-shaped triple-layer optical fibers with highly-germanium-doped core and F-doped inner cladding.
Acoustic modal analysis and control in w-shaped triple-layer optical fibers with highly-germanium-doped core and F-doped inner cladding.
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DOI：
10.1364/oe.16.010006
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发表时间：
2008-07
期刊：
影响因子：
3.8
通讯作者：
Weiwen Zou;Zuyuan He;K. Hotate
中科院分区：
文献类型：
--
作者：
Weiwen Zou;Zuyuan He;K. Hotate
采用数值模拟方法研究了纤芯高Δ掺锗内包层掺氟W型光纤（F-HDF）的声学模态特性。F-HDF中的声模截止条件与光模的截止条件相反，这是因为掺F内包层对声波导和光波导的贡献不同。声学色散特性在很大程度上相对于光纤芯或光纤内包层中的声学模式的位置而变化。理论上和实验上发现相邻声学模式之间的谐振频率间隔与芯的锗浓度具有二次关系。我们还研究了将高阶声学模式移动到掺F内包层中的临界条件，并验证了将L（01）和L（03）声学模式用于基于光纤布里渊的应变和温度区分传感的最佳可行性。
The numerical study of acoustic modal properties in w-shaped optical fibers with high-delta germanium-doped core and F-doped inner cladding (F-HDF) is demonstrated. The cutoff conditions of acoustic modes in the F-HDF show opposite behaviors in contrast with those of optical ones because F-doped inner cladding contributes differently to acoustic and optical waveguides. The acoustic dispersion characteristics vary to a great extent with respect to the location of the acoustic modes in the fiber's core or in the fiber's inner cladding. The resonance frequency spacing between neighboring acoustic modes is theoretically and experimentally found to have a quadratic relation to the core's germanium concentration. We also investigate the critical conditions to move high-order acoustic modes into the F-doped inner cladding and validate the optimal feasibility of employing L(01) and L(03) acoustic modes to fiber-optic Brillouin-based discriminative sensing of strain and temperature.