DAS over 1,007-km Hybrid Link with 10-Tb/s DP-16QAM Co-propagation using Frequency-Diverse Chirped Pulses

Ip, Ezra; Huang, Yue-Kai; Huang, Ming-Fang; Yaman, Fatih; Wellbrock, Glenn A.; Xia, Tiejun J.; Wang, Ting; Asahi, Koji; Aono, Yoshiaki

doi:10.1364/ofc.2022.th4a.2

Cited by 12 publications

(5 citation statements)

References 6 publications

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“…In recent years, several works have integrated coherent optical communication and DOFS using FDM and WDM 25,[38][39][40][41] . Generally, coherent optical communication is used for long range transmission.…”

Section: Spectral Efficiency Demodulation Complexity and Transmission...mentioning

confidence: 99%

“…Although the sensing distance of Φ-OTDR is generally limited to a few tens of kilometres, it offers remarkable advantages of high sensitivity, high accuracy, fast response, and fully distributed measurements. Thus, Φ-OTDR has been used to exploit more functionalities for fibre-optic network 25,33,34,[38][39][40][41] . Initially, Φ-OTDR only utilized dedicated or idle undersea fibre cables as the sensing medium to detect seismic waves 20,33,34 .…”

Section: Introductionmentioning

confidence: 99%

“…Initially, Φ-OTDR only utilized dedicated or idle undersea fibre cables as the sensing medium to detect seismic waves 20,33,34 . In recent years, Φ-OTDR has been integrated into coherent optical communication networks by wavelength-division multiplexing (WDM) and frequencydivision multiplexing (FDM) to enable both data transmission and distributed vibration detection [38][39][40][41] . With these integrations, traffic monitoring and road roughness detection have already been explored in the existing fibreoptic networks.…”

Section: Introductionmentioning

confidence: 99%

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Integrated sensing and communication in an optical fibre

Jiang

Pan

et al. 2023

Light Sci Appl

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The integration of high-speed optical communication and distributed sensing could bring intelligent functionalities to ubiquitous optical fibre networks, such as urban structure imaging, ocean seismic detection, and safety monitoring of underground embedded pipelines. This work demonstrates a scheme of integrated sensing and communication in an optical fibre (ISAC-OF) using the same wavelength channel for simultaneous data transmission and distributed vibration sensing. The scheme not only extends the intelligent functionality for optical fibre communication system, but also improves its transmission performance. A periodic linear frequency modulation (LFM) light is generated to act as the optical carrier and sensing probe in PAM4 signal transmission and phase-sensitive optical time-domain reflectometry (Φ-OTDR), respectively. After a 24.5 km fibre transmission, the forward PAM4 signal and the carrier-correspondence Rayleigh backscattering signal are detected and demodulated. Experimental results show that the integrated solution achieves better transmission performance (~1.3 dB improvement) and a larger launching power (7 dB enhancement) at a 56 Gbit/s bit rate compared to a conventional PAM4 signal transmission. Meanwhile, a 4 m spatial resolution, 4.32-nε/$$\sqrt {Hz}$$ H z strain resolution, and over 21 kHz frequency response for the vibration sensing are obtained. The proposed solution offers a new path to further explore the potential of existing or future fibre-optic networks by the convergence of data transmission and status sensing. In addition, such a scheme of using shared spectrum in communication and distributed optical fibre sensing may be used to measure non-linear parameters in coherent optical communications, offering possible benefits for data transmission.

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Section: Spectral Efficiency Demodulation Complexity and Transmission...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Integrated sensing and communication in an optical fibre

Jiang

Pan

et al. 2023

Light Sci Appl

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“…Phase-sensitive optical time-domain reflectometry (ϕ-OTDR) has garnered significant attention in academic and industrial fields in recent years, with the outstanding advantage of long-distance and large-scale sensing for acoustic waves and vibrations. Notably, substantial advancements have been achieved in enhancing sensor performance, particularly in the sensing distance, 1 sensitivity, 2 spatial resolution, 3 , 4 and so on.…”

Section: Introductionmentioning

confidence: 99%

“…There are two technical strategies summarized to improve the SNR of ϕ-OTDR system: (1) improve the backscattered signal power and (2) decrease the system noise power. There have been many studies focusing on boosting the backscattered light power, and various methods have been explored, such as pulse compression through pulse-coding 6 or nonlinear/linear frequency modulated (LFM) pulses, 7 , 8 distributed amplification 9 , 10 or multi-span online amplification, 1 , 11 enhanced backscattering fiber, 12 and more.…”

Section: Introductionmentioning

confidence: 99%

Phase-sensitive optical time-domain reflectometry with improved signal-to-noise ratio and quantization noise tolerance using power-tunable local oscillator

et al. 2023

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.A power-tunable local oscillator (LO) is utilized for long-distance phase-sensitive optical time-domain reflectometry (ϕ-OTDR) systems. The scheme uses a LO whose power is intentionally varied inversely with the backscattered signal power to suppress the dynamic signal range before receiving, which realizes a higher far-end signal-to-noise ratio (SNR) while avoiding receiver power saturation. Meanwhile, the suppressed signal range allows for the use of low-resolution analog-to-digital converters (ADC). We implemented the scheme over a 98-km standard single-mode fiber, and the results show that the scheme achieves a 3.4 dB far-end SNR improvement. When the ADC resolution decreases from 13 to 8 bits, the proposed scheme shows a negligible SNR penalty. Compared to systems using power-fixed LO and 8-bit ADCs, our proposed scheme achieves a 4.8-dB reduction in self-phase noise power under the same conditions.

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A review of distributed acoustic sensing applications for railroad condition monitoring

Rahman,

Taheri,

Dababneh

et al. 2024

Mechanical Systems and Signal Processing

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DAS over 1,007-km Hybrid Link with 10-Tb/s DP-16QAM Co-propagation using Frequency-Diverse Chirped Pulses

Abstract: We report the first distributed acoustic sensing (DAS) results over >1,000 km on a field-lab hybrid link using chirped-pulses with correlation detection and 20× frequency-diversity, achieving a sensitivity of 100 p ∈ / Hz at 20-meters spatial resolution.

Cited by 12 publications

References 6 publications

Integrated sensing and communication in an optical fibre

Integrated sensing and communication in an optical fibre

Phase-sensitive optical time-domain reflectometry with improved signal-to-noise ratio and quantization noise tolerance using power-tunable local oscillator

A review of distributed acoustic sensing applications for railroad condition monitoring

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