Influence of Pump Light on LP01 and LP11 Modes in Few-Mode Fiber Brillouin Optical Time Domain Reflectometry

IF 2.1 4区物理与天体物理 Q2 OPTICS

Photonics Pub Date : 2024-06-05 DOI:10.3390/photonics11060539

Yunqi Hao, Yiliang Han, Weitong Liao, Miao Miao, Kun Yang

{"title":"Influence of Pump Light on LP01 and LP11 Modes in Few-Mode Fiber Brillouin Optical Time Domain Reflectometry","authors":"Yunqi Hao, Yiliang Han, Weitong Liao, Miao Miao, Kun Yang","doi":"10.3390/photonics11060539","DOIUrl":null,"url":null,"abstract":"The quality of pump pulse in few-mode-fiber Brillouin optical time domain reflectometry (FMF-BOTDR) is vital for the spontaneous Brillouin scattering of modes LP01 and LP11 because it is the comprehensive effect of the main laser linewidth and pulse width, which is firstly discussed as we know. Numerical and experimental analysis are made for the amplitude and linewidth distribution, corresponding to the signal–noise ratio (SNR) and frequency resolution in BOTDR, respectively. Simulation shows the linewidths and peak values of Brillouin scattering have the same tendency for the LP01 mode and LP11 mode when the laser linewidth is less than 1 MHz but decreases slowly until they are the same when the laser linewidth is wider than 1 MHz. With the pulse width widening, the Brillouin linewidths for LP01 and LP11 modes both decrease sharply, almost to the natural linewidth of fiber 41 MHz and 35 MHz. Experimental results show that the amplitude distribution for the LP01 mode is always larger than for the LP11 mode if the main laser has the same linewidth and the frequency fluctuation is at least 2 MHz with the fiber laser and LP11 mode. The above results could provide improved sensing resolution for FMF-BOTDR sensing system.","PeriodicalId":20154,"journal":{"name":"Photonics","volume":null,"pages":null},"PeriodicalIF":2.1000,"publicationDate":"2024-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Photonics","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.3390/photonics11060539","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"OPTICS","Score":null,"Total":0}

引用次数: 0

Abstract

The quality of pump pulse in few-mode-fiber Brillouin optical time domain reflectometry (FMF-BOTDR) is vital for the spontaneous Brillouin scattering of modes LP01 and LP11 because it is the comprehensive effect of the main laser linewidth and pulse width, which is firstly discussed as we know. Numerical and experimental analysis are made for the amplitude and linewidth distribution, corresponding to the signal–noise ratio (SNR) and frequency resolution in BOTDR, respectively. Simulation shows the linewidths and peak values of Brillouin scattering have the same tendency for the LP01 mode and LP11 mode when the laser linewidth is less than 1 MHz but decreases slowly until they are the same when the laser linewidth is wider than 1 MHz. With the pulse width widening, the Brillouin linewidths for LP01 and LP11 modes both decrease sharply, almost to the natural linewidth of fiber 41 MHz and 35 MHz. Experimental results show that the amplitude distribution for the LP01 mode is always larger than for the LP11 mode if the main laser has the same linewidth and the frequency fluctuation is at least 2 MHz with the fiber laser and LP11 mode. The above results could provide improved sensing resolution for FMF-BOTDR sensing system.

查看原文本刊更多论文

泵浦光对少模光纤布里渊光时域反射仪中 LP01 和 LP11 模式的影响

少模光纤布里渊光时域反射仪（FMF-BOTDR）中泵浦脉冲的质量对 LP01 和 LP11 模式的自发布里渊散射至关重要，因为它是主激光线宽和脉冲宽度的综合影响，这是我们首次讨论的问题。对振幅和线宽分布进行了数值和实验分析，这分别与 BOTDR 中的信噪比（SNR）和频率分辨率相对应。模拟结果表明，当激光线宽小于 1 MHz 时，LP01 模式和 LP11 模式的布里渊散射线宽和峰值有相同的趋势，但当激光线宽大于 1 MHz 时，线宽和峰值会缓慢减小，直至相同。随着脉冲宽度的增宽，LP01 和 LP11 模式的布里渊线宽都急剧下降，几乎降至光纤的自然线宽 41 MHz 和 35 MHz。实验结果表明，如果主激光器具有相同的线宽，且光纤激光器和 LP11 模式的频率波动至少为 2 MHz，则 LP01 模式的振幅分布总是大于 LP11 模式。上述结果可以提高 FMF-BOTDR 传感系统的传感分辨率。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Photonics Physics and Astronomy-Instrumentation

CiteScore

2.60

自引率

20.80%

发文量

817

审稿时长

8 weeks

期刊介绍： Photonics (ISSN 2304-6732) aims at a fast turn around time for peer-reviewing manuscripts and producing accepted articles. The online-only and open access nature of the journal will allow for a speedy and wide circulation of your research as well as review articles. We aim at establishing Photonics as a leading venue for publishing high impact fundamental research but also applications of optics and photonics. The journal particularly welcomes both theoretical (simulation) and experimental research. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Electronic files and software regarding the full details of the calculation and experimental procedure, if unable to be published in a normal way, can be deposited as supplementary material.