Distributed Modal Birefringence Measurement in a Few-Mode Fiber Based on Stimulated Brillouin Scattering

被引：4

作者：

Catalano, E. ^{[1
]}

Vallifuoco, R. ^{[1
]}

Zeni, L. ^{[1
]}

Cappelletti, M. ^{[2
]}

Galtarossa, A. ^{[2
]}

Palmieri, L. ^{[2
]}

Minardo, A. ^{[1
]}

机构：

[1] Univ Campania Luigi Vanvitelli, Dept Engn, I-81031 Aversa, Italy

[2] Univ Padua, Dept Informat Engn, I-35131 Padua, Italy

来源：

JOURNAL OF LIGHTWAVE TECHNOLOGY | 2024年 / 42卷 / 07期

关键词：

Few-mode fibers (FMF); modal birefringence; stimulated Brillouin scattering; MULTIPARAMETER SENSOR; TEMPERATURE; DISPERSION;

D O I：

10.1109/JLT.2023.3337654

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 present a novel method to characterize the modal birefringence in a few-mode fiber (FMF), based on stimulated Brillouin scattering. The method exploits two phenomena which can be observed in distributed Brillouin measurements: the dependence of the Brillouin frequency shift (BFS) on the effective refractive index (ERI) of the interacting optical beams, and the spatial oscillations of the Brillouin gain along the FMF deriving from multimodal interference. Using both phenomena, a wide range of ERI separations can be measured, from approximate to 10(-7) to 10(-2) or more. The method has been demonstrated over a two-mode graded-index FMF, using two photonic lanterns to selectively excite the desired spatial modes. The birefringence values obtained using the proposed method have been validated using a different distributed technique, based on the analysis of the fiber's Rayleigh-backscattered trace acquired in the frequency domain.

引用

页码：2473 / 2479

页数：7

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