Savović Svetislav, Aidinis Konstantinos, Djordjevich Alexandar, Min Rui
University of Kragujevac, R. Domanovića 12, 34000, Kragujevac, Serbia.
Department of Electrical Engineering, Ajman University, P.O. Box 346, Ajman, United Arab Emirates.
Heliyon. 2023 Jul 17;9(7):e18156. doi: 10.1016/j.heliyon.2023.e18156. eCollection 2023 Jul.
The Langevin equation (LE) is used to evaluate mode coupling in multimode step-index polymer optical fiber (SI POF) that is both unstrained and strained. The numerical solution of the LE matches the numerical solution of the power flow equation (PFE). Strain-induced mode coupling is noticeably stronger in strained fiber than in unstrained fiber of the same types. Therefore, compared to similar lengths for unstrained fibers, the coupling length of the equilibrium mode distribution (EMD) is attained and the length of fiber required to produce a steady-state distribution (SSD) are both much shorter for strained fibers. We have demonstrated that the mode coupling in strained and unstrained multimode SI POFs that comes from the random perturbations (RPs) of the fiber can be successfully treated by the LE. The study's findings can be used to improve communication and sensory systems that use multimode SI POFs under different bending circumstances. Additionally, it is crucial to be able to compute the modal distribution of the SI POFs used in the optical fiber sensory system at a specific length and under various bending scenarios.
朗之万方程（LE）用于评估未受应变和受应变的多模阶跃折射率聚合物光纤（SI POF）中的模式耦合。LE的数值解与功率流方程（PFE）的数值解相匹配。在相同类型的受应变光纤中，应变引起的模式耦合明显比未受应变光纤中的更强。因此，与未受应变光纤的类似长度相比，受应变光纤达到平衡模式分布（EMD）的耦合长度以及产生稳态分布（SSD）所需的光纤长度都要短得多。我们已经证明，LE可以成功处理受应变和未受应变的多模SI POF中由光纤随机扰动（RP）引起的模式耦合。该研究结果可用于改进在不同弯曲情况下使用多模SI POF的通信和传感系统。此外，能够计算光纤传感系统中使用的SI POF在特定长度和各种弯曲情况下的模式分布至关重要。
