Zuyuan He

Zuyuan He


Research Focus & Metrics

Academic Career Length

31Years (1996-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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16 February 2021 in Journal of Lightwave Technology
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Journal Article
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ZHZuyuan He
Zuyuan He
QLQingwen Liu
Qingwen Liu
Fiber-optic distributed acoustic sensor (DAS) is one of the most attractive and promising fiber-optic sensing technologies in the recent decade. It can simultaneously detect and retrieve multiple vibrations over a long distance, and the high sampling rate provides abundant information of the environment. This article reviews the principles involved in DAS system, including three types of reflectometry to locate the Rayleigh backscattering (RBS) along the fiber, and the methods to recover the vibration waveform by the phase or spectrum of RBS. The technologies and recent progresses on DAS systems are introduced, and two kinds of typical applications of DAS are reviewed. Finally, the possible research trends are discussed.

29 July 2008 in Optics Express
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Journal Article
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YMYosuke Mizuno
Yosuke Mizuno
WZWeiwen Zou
Weiwen Zou
ZHZuyuan He
Zuyuan He
KHKazuo Hotate
Kazuo Hotate
We propose a Brillouin optical correlation-domain reflectometry (BOCDR), which can measure the distribution of strain and/or temperature along an optical fiber from a single end, by detecting spontaneous Brillouin scattering with controlling the interference of continuous lightwaves. In a pulse-based conventional Brillouin optical time-domain reflectometry (BOTDR), it is difficult in principle to achieve a spatial resolution less than 1 m, and the measurement time is as long as 5-10 minutes. On the contrary, the continuous-wave-based BOCDR can exceed the limit of 1-m resolution, and realize much faster measurement and random access to measuring positions. Spatial resolution of 40 cm was experimentally demonstrated with sampling rate of 50 Hz.

30 March 2017 in Optics Express
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Journal Article
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DCDian Chen
Dian Chen
QLQingwen Liu
Qingwen Liu
ZHZuyuan He
Zuyuan He
For a distributed fiber-optic vibration sensor (DFVS), the vibration signal extracted from the phase of backscattering has a linear response to the applied vibration, and is more attractive than that from the intensity term. However, the large phase noise at a random weak-fading-point seriously limits the sensor's credibility. In this paper, a novel phase-detection DFVS is developed, which effectively eliminates the weak-fading-point. The relationship between phase noise and the intensity of backscattering is analyzed, and the inner-pulse frequency-division method and rotated-vector-sum method are introduced to effectively suppress phase noise. In experiments, two simultaneous vibrations along the 35-kilometer-long fiber are clearly detected by phase detection with the signal-to-noise ratio (SNR) over 26 dB. The spatial resolution approaches 5 m and the vibration response bandwidth is 1.25 kHz.

22 July 2019 in Nature Communications
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Journal Article
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YLYingjie Liu
Yingjie Liu
Ke XuKe Xu
Ke Xu
SWShuai Wang
Shuai Wang
WSWeihong Shen
Weihong Shen
HXHucheng Xie
Hucheng Xie
QSQinghai Song
Qinghai Song
On-chip integrated mode-division multiplexing (MDM) is an emerging technique for large-capacity data communications. In the past few years, while several configurations have been developed to realize on-chip MDM circuits, their practical applications are significantly hindered by the large footprint and inter-mode cross talk. Most importantly, the high-speed MDM signal transmission in an arbitrarily routed circuit is still absent. Herein, we demonstrate the MDM circuits based on digitized meta-structures which have extremely compact footprints. 112 Gbit/s signals encoded on each mode are arbitrarily routed through the circuits consisting of many sharp bends and compact crossings with a bit error rate under forward error correction limit. This will significantly improve the integration density and benefit various on-chip multimode optical systems.

21 January 2009 in Optics Express
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Journal Article
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WZWeiwen Zou
Weiwen Zou
ZHZuyuan He
Zuyuan He
KHKazuo Hotate
Kazuo Hotate
This paper presents a novel method that realizes simultaneous and completely discriminative measurement of strain and temperature using one piece of Panda-type polarization-maintaining fibre. Two independent optical parameters in the fiber, the Brillouin frequency shift and the birefringence, are measured by evaluating the spectrum of stimulated Brillouin scattering (SBS) and that of the dynamic acoustic grating generated in SBS to get two independent responses to strain and temperature. We found that the Brillouin frequency shift and the birefringence have the same signs for strain-dependence but opposite signs for temperature-dependence. In experiment, the birefringence in the PMF is characterized with a precision of ~10-8 by detecting the diffraction spectrum of the dynamic acoustic grating. A reproducible accuracy of discriminating strain and temperature as fine as 3 micro-strains and 0.08 degrees Celsius is demonstrated.

9 August 2006 in Optics Letters
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Journal Article
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KSKwang Yong Song
Kwang Yong Song
ZHZuyuan He
Zuyuan He
KHKazuo Hotate
Kazuo Hotate
Distributed strain sensing with millimeter-order spatial resolution is demonstrated in optical fibers based on Brillouin optical correlation domain analysis. A novel beat lock-in detection scheme is introduced to suppress background noises coming from the reflection of Brillouin pump waves. The Brillouin frequency shifts of 3⁢mm fiber sections are successfully measured with a theoretical spatial resolution of 1.6 mm.