Low-Coherence Brillouin Optical Correlation- Domain Reflectometry Based on Periodic Pseudo-Random Modulation

被引:4
|
作者
Otsubo, Kenta [1 ]
Zhu, Guangtao [1 ]
Noda, Kohei [2 ]
Kiyozumi, Takaki [1 ]
Takahashi, Hiroshi [3 ]
Koshikiya, Yusuke [3 ]
Mizuno, Yosuke [1 ,4 ]
机构
[1] Yokohama Natl Univ, Fac Engn, Yokohama, Kanagawa 2408501, Japan
[2] Univ Tokyo, Grad Sch Engn, Tokyo 1538904, Japan
[3] NTT Corp, Access Network Serv Syst Labs, Ibaraki 3050805, Japan
[4] Yokohama Natl Univ, Inst Multidisciplinary Sci, Yokohama, Kanagawa 2408501, Japan
关键词
Brillouin optical correlation-domain reflectometry; distributed sensing; low coherence; pseudo-random modulation; strain sensing; temperature sensing; MEASUREMENT RANGE ENLARGEMENT; PROPOSAL; LASER; DELAY;
D O I
10.1109/JLT.2024.3436928
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
Brillouin optical correlation-domain reflectometry (BOCDR) is a technique for measuring the distribution of strain and temperature along an optical fiber, offering advantages such as operation with light injection from one end of the sensing fiber, relatively high spatial resolution, and random-access capability to sensing points. However, it faces a trade-off between spatial resolution and measurement range. In response, low-coherence BOCDR using a randomly modulated light source has been proposed, but this method requires a variable delay line for scanning the measurement position, limiting the measurement range. This paper proposes low-coherence BOCDR based on periodic pseudo-random modulation to address this issue and demonstrates its proof-of-concept operation. First, the dependence of the light source output spectrum on modulation parameters is investigated using a delayed self-homodyne method, showing the potential to resolve the trade-off between spatial resolution and measurement range. Subsequently, we demonstrate the capability of measuring strain distribution along optical fibers without a variable delay line under multiple conditions. Further, we show through simulation that this method can perform more accurate distributed strain measurements than standard BOCDR.
引用
收藏
页码:6233 / 6239
页数:7
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