Refining High-Resolution Brillouin Optical Correlation-Domain Reflectometry Using Polymer Fibers by Modeling Refractive Index Differences in Optical Paths

IF 1.1 4区工程技术 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEJ Transactions on Electrical and Electronic Engineering Pub Date : 2025-05-20 DOI:10.1002/tee.70066

Shimbu Shirai, Seiga Ochi, Keita Kikuchi, Shuto Tsurugai, Daisuke Yamane, Heeyoung Lee, Yosuke Mizuno

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Abstract

High-spatial-resolution Brillouin optical correlation-domain reflectometry (BOCDR) in perfluorinated graded-index polymer optical fibers (PFGI-POFs) is gaining attention for structural health monitoring. A major challenge has been accurately predicting Rayleigh noise behavior, which constrains the modulation amplitude and spatial resolution. However, prior models did not consider differences in optical path lengths caused by the refractive indices of silica fibers (used in circulators) and PFGI-POFs. We refine the noise model to incorporate these differences. Experiments with varying fiber lengths show that the revised model more accurately predicts Rayleigh noise bandwidth, especially with longer circulator fibers. Errors of up to 120 MHz in the conventional model are reduced to within 25 MHz, showing the importance of proper optical path modeling in BOCDR. © 2025 Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.

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利用聚合物光纤改进高分辨率布里渊光相关域反射法，模拟光路折射率差异

全氟梯度折射率聚合物光纤（PFGI-POFs）的高空间分辨率布里渊光相关域反射法（BOCDR）在结构健康监测中受到越来越多的关注。一个主要的挑战是准确预测瑞利噪声行为，这限制了调制幅度和空间分辨率。然而，先前的模型没有考虑二氧化硅纤维（用于循环器）和PFGI-POFs的折射率引起的光程长度差异。我们改进了噪声模型以纳入这些差异。不同光纤长度的实验表明，修正后的模型能更准确地预测瑞利噪声带宽，特别是对于较长的环形光纤。传统模型中高达120 MHz的误差被降低到25 MHz以内，显示了正确的光路建模在BOCDR中的重要性。©2025日本电气工程师协会和Wiley期刊有限责任公司。

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来源期刊

IEEJ Transactions on Electrical and Electronic Engineering 工程技术-工程：电子与电气

CiteScore

2.70

自引率

10.00%

发文量

199

审稿时长

4.3 months

期刊介绍： IEEJ Transactions on Electrical and Electronic Engineering (hereinafter called TEEE ) publishes 6 times per year as an official journal of the Institute of Electrical Engineers of Japan (hereinafter "IEEJ"). This peer-reviewed journal contains original research papers and review articles on the most important and latest technological advances in core areas of Electrical and Electronic Engineering and in related disciplines. The journal also publishes short communications reporting on the results of the latest research activities TEEE ) aims to provide a new forum for IEEJ members in Japan as well as fellow researchers in Electrical and Electronic Engineering from around the world to exchange ideas and research findings.