摘要
布里渊光时域分析仪(BOTDA)因其长距离分布式传感的优势而得到学术界和产业界的广泛研究与应用,光脉冲编码技术可以在不牺牲空间分辨率和测量时间的前提下辅助BOTDA进一步实现可观的信噪比提升,被认为是最高效(高信噪比提升和低硬件成本)的性能提升方法之一,具有显著的优势和应用前景。本文围绕基于光脉冲编码技术的BOTDA,介绍了用于分布式光纤传感领域的几种主流的光脉冲编码技术的原理,综述了近些年基于光脉冲编码的BOTDA传感系统的研究进展。
Significance Brillouin optical time-domain analyzer(BOTDA)has been widely studied and employed in academia and industry due to its capability of providing information about the spatial distribution of targeted quantities over a long optical fiber.Several advanced techniques have been proposed during the last decade to further enhance the signal-to-noise ratio(SNR)beyond the conventional single-pulse BOTDA.As one of the most efficient approaches,optical pulse coding technology has been extensively developed,and it launches one or several trains of pulses into the sensing fiber,with the exploitation of code types such as Golay,Simplex,Cyclic,genetic-optimized codes,and their derivatives.Meanwhile,this technology can assist BOTDA to further achieve considerable SNR improvement without compromising the spatial resolution and measurement time and thus has significant superiority and application prospects.Despite many corresponding advances,there are still a series of challenges in cost reduction and performance improvement.Therefore,it is important and necessary to summarize the existing research to inspire the future development of this field more rationally.Focusing on the BOTDA sensors based on optical pulse coding,we introduce the principle of several mainstream optical pulse coding technologies employed in distributed fiber sensors,and discuss the research progress of BOTDA sensors based on optical pulse coding in recent years.Progress The fundamentals of conventional optical pulse coding technologies applied in BOTDA sensors are reviewed in detail,including unicolor unipolar codes(Golay,Simplex,Cyclic,and deconvolution-based codes),color codes,and bipolar codes.The theoretical coding gain of such present mainstream coding schemes is also summarized,all of which can be approximately regarded as proportional to the square root of the code length.It is significant and necessary to improve and optimize the coding system for reducing the influence of system imperfections and get as close as possible to the theoretica
作者
靳思梦
杨智生
洪小斌
伍剑
Jin Simeng;Yang Zhisheng;Hong Xiaobin;Wu Jian(State Key Laboratory of Information Photonics and Optical Communications,Beijing University of Posts and Telecommunications,Beijing 100876,China)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2024年第1期271-290,共20页
Acta Optica Sinica
基金
国家自然科学基金(62375023,62275028)
北京市科技新星计划(Z211100002121074)
中央高校基本科研业务费专项基金(2023RC51)。
关键词
光纤光学
分布式传感器
受激布里渊散射
光脉冲编码
fiber optics
distributed sensor
stimulated Brllouin scattering
optical pulse coding
