High performance CP-ΦOTDR utilizing the negative band

Xiong, Ji; Wang, Zinan; Yu-hua, WU; Chen, Yong-Xiang; Li, J. Q.; Rao, Yunjiang

doi:10.1364/ofs.2018.fb5

Cited by 6 publications

(4 citation statements)

References 13 publications

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“…J. Xiong combined positive and negative beat signals, FDM technology and chirped pulse Φ-OTDR, to increase the frequency response range by 8 times. This method uses a total bandwidth of 495 MHz [15]. J. Jiang proposed continuous chirped pulse Φ-OTDR has achieved a spatial resolution of 4.4m and a sensing bandwidth of 1.042MHz on 1013m optical fiber.…”

Section: Introductionmentioning

confidence: 99%

Optical fiber distributed acoustic sensing based on NUFDM-NLFM

Zhang

Yuan

et al. 2023

Second International Conference on Optoelectronic Information and Computer Engineering (OICE 2023)

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In the field of optical fiber distributed acoustic sensing, the combination of pulse compression and frequency division multiplexing will occupy a large bandwidth. In this paper, a novel distributed optical fiber acoustic sensor system is proposed, which can reduce the spectrum resources occupied by the combination of the above two technologies. The system continuously injects nonlinear frequency modulation detection pulses of different frequency ranges. The frequency response range of vibration is improved by frequency division multiplexing, and the spatial resolution is enhanced by nonlinear frequency modulation. Nonlinear frequency modulation also improves the sidelobe rejection ratio without loss of signal-to-noise ratio. In the experiment, eight frequencies were multiplexed using a 120MHz bandwidth. We achieved a spatial resolution of about 5m and a frequency response range of 1~20kHz on a 16.3km fiber.

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Section: Introductionmentioning

confidence: 99%

Optical fiber distributed acoustic sensing based on NUFDM-NLFM

Zhang

Yuan

et al. 2023

Second International Conference on Optoelectronic Information and Computer Engineering (OICE 2023)

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“…J. Xiong et al combined positive and negative pulses, FDM technology, and chirped pulse Φ-OTDR, using a 4-frequency band FDM approach that increased the frequency response range by a factor of eight. In a sensing range of 75 km, they achieved a repetition rate of 9.7 kHz, utilizing a total bandwidth of 495 MHz [26]. J. Jiang et al introduced a Continuous Chirped Pulse Φ-OTDR, achieving a spatial resolution of 4.4 m and a sensing bandwidth of 1.042 MHz on a 1013 m long optical fiber.…”

Section: Introductionmentioning

confidence: 99%

A Phase-Sensitive Optical Time Domain Reflectometry with Non-Uniform Frequency Multiplexed NLFM Pulse

Li,

Zhang,

Yuan

et al. 2023

Sensors

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In the domain of optical fiber distributed acoustic sensing, the persistent challenge of extending sensing distances while concurrently improving spatial resolution and frequency response range has been a complex endeavor. The amalgamation of pulse compression and frequency division multiplexing methodologies has provided certain advantages. Nevertheless, this approach is accompanied by the drawback of significant bandwidth utilization and amplified hardware investments. This study introduces an innovative distributed optical fiber acoustic sensing system aimed at optimizing the efficient utilization of spectral resources by combining compressed pulses and frequency division multiplexing. The system continuously injects non-linear frequency modulation detection pulses spanning various frequency ranges. The incorporation of non-uniform frequency division multiplexing augments the vibration frequency response spectrum. Additionally, nonlinear frequency modulation adeptly reduces crosstalk and enhances sidelobe suppression, all while maintaining a favorable signal-to-noise ratio. Consequently, this methodology substantially advances the spatial resolution of the sensing system. Experimental validation encompassed the multiplexing of eight frequencies within a 120 MHz bandwidth. The results illustrate a spatial resolution of approximately 5 m and an expanded frequency response range extending from 1 to 20 kHz across a 16.3 km optical fiber. This achievement not only enhances spectral resource utilization but also reduces hardware costs, making the system even more suitable for practical engineering applications.

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“…Notably, in 2017, D. Chen et al introduced a DAS system employing FDM-TGD-OFDR, achieving a 9 kHz frequency response across a 24.7 km distance with modulation pulses spanning five frequency segments within a 100 MHz bandwidth [8]. Similarly, in 2018, J. Xiong et al combined positive and negative pulse signals, FDM technology, and chirped pulse ϕ-OTDR, achieving a spatial resolution of 9.3 m and a frequency range of 0-24 kHz over a 2.1 km sensing distance using 195 MHz modulation bandwidth and four-frequency segment FDM [9]. Moreover, in 2023, Z. Xiao et al proposed an equivalent sampling method based on compressed sensing and interval-scanning pulses, thus enhancing the frequency response of phase-sensitive optical time-domain reflectometry through periodic non-uniform sampling [10].…”

Section: Introductionmentioning

confidence: 99%

φ-OTDR Based on Orthogonal Frequency-Division Multiplexing Time Sequence Pulse Modulation

Li,

Zhang,

Yuan

et al. 2023

Applied Sciences

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This study introduces an innovative phase-sensitive optical time-domain reflectometer (φ-OTDR) technology based on orthogonal frequency-division multiplexing (OFDM) and nonlinear frequency modulation (NLFM) pulse modulation sequences. The proposed approach addresses the inherent trade-offs among spatial resolution, frequency response range, and sensing distance that conventional φ-OTDR systems encounter. This method optimizes spatial resolution and sensing distance by modulating both the frequency and phase of optical pulses. Moreover, it enhances sidelobe suppression by adjusting the nonlinearity of frequency modulation, reducing interference between adjacent signals, and improving the signal-to-noise ratio (SNR). Additionally, orthogonal frequency-division multiplexing expands the frequency response range. This paper elucidates the fundamental principles and implementation of OFDM-NLFM time-domain pulse modulation techniques and designs, experimentally validates a φ-OTDR system based on this method, and conducts comprehensive testing and analysis of the system’s performance. The experimental results demonstrate that the proposed φ-OTDR system achieves an 11 m spatial resolution and a frequency response range of 1–10 kHz over a 16.3 km optical fiber, utilizing a 65 MHz frequency bandwidth with multiplexed signals across four frequencies. This innovative approach reduces hardware resource consumption, opening up promising prospects for various practical engineering applications in optical fiber sensing technology.

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High performance CP-ΦOTDR utilizing the negative band

Cited by 6 publications

References 13 publications

Optical fiber distributed acoustic sensing based on NUFDM-NLFM

Optical fiber distributed acoustic sensing based on NUFDM-NLFM

A Phase-Sensitive Optical Time Domain Reflectometry with Non-Uniform Frequency Multiplexed NLFM Pulse

φ-OTDR Based on Orthogonal Frequency-Division Multiplexing Time Sequence Pulse Modulation

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