利用相位调频方法增强FDM相敏OTDR信噪比

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology Pub Date : 2025-04-16 DOI:10.1016/j.optlastec.2025.112980

Yuting Li , Hongjuan Zhang , Pengfei Wang , Yan Gao , Yu Wang , Baoquan Jin

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引用次数: 0

摘要

频分复用（FDM）用于相敏光时域反射计（Φ-OTDR）系统的高频响应。然而，通过马赫-曾德尔调制器将探测脉冲能量重新分配到双侧频带会导致FDM Φ-OTDR系统信噪比（SNR）的恶化。提出了一种补偿探测脉冲能量损失的相位调频方法。在脉冲压缩过程中，采用共轭相位调频信号作为匹配滤波器，实现了对探测脉冲能量的最大补偿。实验结果表明，使用六通道传感系统，在21.6 km光纤中，频率低于11 kHz的正弦波信号的信噪比可达到约46 dB。与传统FDM Φ-OTDR系统的恢复信号相比，恢复后的4.3 kHz正音信号的信噪比提高了7.81 dB，有效提高了系统的信噪比。这种创新的方法为光纤传感技术在检测高频微弱信号方面的实际工程应用提供了广阔的前景。

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SNR enhancement for FDM phase-sensitive OTDR using phase-frequency modulation method

Frequency division multiplexing (FDM) is used for high frequency response in the phase-sensitive optical time domain reflectometer (Φ-OTDR) system. However, the redistribution of probe pulse energy into bilateral bands by the Mach-Zehnder modulator results in a deterioration of the signal-to-noise (SNR) in FDM Φ-OTDR systems. A phase-frequency modulation method for compensating for the energy loss of probe pulses is proposed. The maximum compensation of the probe pulse energy is achieved when the conjugated phase-frequency modulation signal is applied as the matched filter in the pulse compression process. Experimental results demonstrate the SNR of the restored sinusoidal acoustic signals with frequencies below 11 kHz can reach approximately 46 dB over 21.6 km optical fiber using a six-channel sensing system. Compared with the restored signals of conventional FDM Φ-OTDR system, the SNR of the restored 4.3 kHz sinusoidal acoustic signal is improved by 7.81 dB, enhancing the system’s SNR effectively. This innovative approach presents a promising prospect for the practical engineering applications of fiber optic sensing technology in detecting weak signals at high frequencies.

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来源期刊

Optics and Laser Technology 物理-光学

CiteScore

8.50

自引率

10.00%

发文量

1060

审稿时长

3.4 months

期刊介绍： Optics & Laser Technology aims to provide a vehicle for the publication of a broad range of high quality research and review papers in those fields of scientific and engineering research appertaining to the development and application of the technology of optics and lasers. Papers describing original work in these areas are submitted to rigorous refereeing prior to acceptance for publication. The scope of Optics & Laser Technology encompasses, but is not restricted to, the following areas: •development in all types of lasers •developments in optoelectronic devices and photonics •developments in new photonics and optical concepts •developments in conventional optics, optical instruments and components •techniques of optical metrology, including interferometry and optical fibre sensors •LIDAR and other non-contact optical measurement techniques, including optical methods in heat and fluid flow •applications of lasers to materials processing, optical NDT display (including holography) and optical communication •research and development in the field of laser safety including studies of hazards resulting from the applications of lasers (laser safety, hazards of laser fume) •developments in optical computing and optical information processing •developments in new optical materials •developments in new optical characterization methods and techniques •developments in quantum optics •developments in light assisted micro and nanofabrication methods and techniques •developments in nanophotonics and biophotonics •developments in imaging processing and systems