基于ROPA技术的超长跨距φOTDR传感系统  

Ultra Long SpanφOTDR Sensing System based on ROPA Technology

作　　者：章诗宇 吴江 李明 聂明超 徐健 ZHANG Shiyu;WU Jiang;LI Ming;NIE Mingchao;XU Jian(Accelink Technologies Co.,Ltd.,Wuhan 430205,China;National Key Laboratory of Optical Communication Technologies and Networks,Wuhan 430074,China;Wuhan Research Institute of Posts and Telecommunications Co.,Ltd.,Wuhan 430074,China;China Mobile Communication Co.,Ltd.,Beijing 100033,China)

机构地区：[1]武汉光迅科技股份有限公司,武汉430205 [2]光通信技术和网络全国重点实验室,武汉430074 [3]武汉邮电科学研究院有限公司,武汉430074 [4]中国移动通信有限公司,北京100033

出　　处：《光通信研究》2024年第2期1-5,共5页Study on Optical Communications

摘　　要：【目的】针对分布式光纤传感系统单跨传感距离受限问题,文章提出了基于远程泵浦光放大器(ROPA)遥泵技术的相位敏感光时域反射仪(φOTDR)分布式光纤传感系统。【方法】采用偏振分集接收技术,获取彼此正交的偏振信号以解决偏振失配问题,分频带处理后抑制相干衰落与偏振衰落。应用高阶拉曼泵浦技术与级联遥泵放大技术,3个远程增益单元选取合适的增益介质长度,引入传输链路中适当位置,耦合远程泵浦单元发送的泵浦光与信号光使铒离子得到激励,实现信号光的无中继放大,解决了现有φOTDR单跨距传感距离不足的问题。【结果】实验结果表明,采用同相正交(IQ)解调算法,压电换能器(PZT)加扰的100 Hz扰动信号可实现线性还原。【结论】结果表明,文章所提系统可实现176.6 km超长单跨距振动信号传感,打破了现有φOTDR单跨距传感距离记录。前176 km振动曲线平稳且振幅低于0.4 rad,三维(3D)瀑布图中无扰动位置相对平稳,链路末端PZT加扰的扰动信号可准确感知。经快速傅里叶变换(FFT)处理后,100 Hz扰动信号的信噪比为8.9 dB。实验结果对于搭建超长跨距φOTDR传感系统提供了一定参考价值,对φOTDR系统的无中继超长距离传感发展具有一定意义。【Objective】For the problem of limited sensing distance of distributed optical fiber sensing system,a Phase-Sensitive Optical Time Domain Reflectometry(φOTDR)distributed optical fiber sensing system based on Remote Optically Pumped Amplifier(ROPA)technology was proposed.【Methods】Adopting polarization diversity reception technology to obtain orthogonal polarization signals to solve the problem of polarization mismatch,Frequency division band processing suppresses coherent fading and polarization fading.Applying high-order Raman pumping technology and cascaded ROPA technology,three remote gain units are selected with appropriate gain medium lengths.Introduced at the appropriate positions in the transmission link,the pump light and signal light are coupled and sent by the remote pumping unit to excite erbium ionst for unrepeatered amplification,realizing ultra long single span vibration signal sensing and solving the problem of insufficient single-span sensing distance of existingφOTDR.【Results】The experimental results show that In-phase and Quadrate(IQ)demodulation algorithm can be used to achieve linear recovery of Piezoelectric Transducer(PZT)disturbed 100 Hz signal.【Conclusion】The results show that this system can achieve vibration signal sensing of 176.6 km ultra long single span,breaking the existingφOTDR single span sensing distance recording.The vibration curve of the first 176 km is stable and the amplitude is below 0.4 rad.The undisturbed position in the three-Dimensional(3D)map is relatively stable,and the disturbance signal added by PZT at the end of the link can be accurately perceived.After Fast Fourier Transform(FFT)transformation processing,the signal-to-noise ratio of the 100 Hz disturbance signal is 8.9 dB.The experimental results are crucial for building ultra long single-spanφOTDR sensing system and provides a certain reference value for the development of unrepeatered ultra long-distance sensing in OTDR systems.

关 键 词：分布式光纤传感技术 相位敏感光时域反射仪 远程泵浦光放大器 

分 类 号：TN914[电子电信—通信与信息系统]