基于超精细数字光学频率梳的免扫描布里渊光时域分析技术

Scanning-free BOTDA based on ultra-fine digital optical frequency comb.

作者信息

Jin Chao, Guo Nan, Feng Yuanhua, Wang Liang, Liang Hao, Li Jianping, Li Zhaohui, Yu Changyuan, Lu Chao

出版信息

Opt Express. 2015 Feb 23;23(4):5277-84. doi: 10.1364/OE.23.005277.

DOI:10.1364/OE.23.005277

Abstract

We realize a scanning-free Brillouin optical time domain analyzer (BOTDA) based on an ultra-fine digital optical frequency comb (DOFC) with 1.95MHz frequency spacing and 2GHz bandwidth. The DOFC can be used to reconstruct the Brillouin gain spectrum (BGS) and locate the Brillouin frequency shift (BFS) without frequency scanning and thus can improve the measurement speed about 100 times compared with the conventional BOTDA. This scanning-free BOTDA scheme has also been demonstrated experimentally with 51.2m spatial resolution over 10km standard single mode fiber (SSMF) and with resolution of 1.5°C for temperature and 43.3με for strain measurement respectively.

摘要

我们基于具有1.95MHz频率间隔和2GHz带宽的超精细数字光学频率梳（DOFC）实现了一种无需扫描的布里渊光时域分析仪（BOTDA）。该DOFC可用于重建布里渊增益谱（BGS）并定位布里渊频移（BFS），无需进行频率扫描，因此与传统BOTDA相比，测量速度可提高约100倍。这种无需扫描的BOTDA方案也已通过实验得到验证，在10km标准单模光纤（SSMF）上具有51.2m的空间分辨率，温度测量分辨率为1.5°C，应变测量分辨率为43.3με。