Unrepeatered remote Φ-OTDR system with single-ended amplifier using hollow-core leading fiber
Rattachement africain : cn. Niveau de preuve : code pays fourni par la source.
Le résumé fourni par la source
Phase-sensitive Optical Time Domain Reflectometry (Φ-OTDR) is widely used for monitoring critical infrastructure. However, conventional Φ-OTDR systems are limited by fiber nonlinear effects, which restrict the probe pulse energy and thus limit the sensing distance. To overcome this bottleneck, this paper innovatively proposes a Φ-OTDR scheme that uses a hollow-core fiber as a leading fiber (LF-HCF). The design leverages the low nonlinearity and low transmission loss of HCF to transmit high-power probe pulse light to a remote fiber under test (RFUT) and to return the backscattered signal generated by the RFUT back to the detection end. In this way, it overcomes the power threshold limitation of conventional Φ-OTDR systems and achieves ultra-long-distance unrepeatered sensing. Moreover, the extremely low transmission delay of the HCF further broadens the system’s vibration response range. Experimental results demonstrate that, over a total transmission distance of 280 km (consisting of 230 km of LF‑HCF and 50 km of RFUT), the system maintains a 1‑meter spatial resolution at the RFUT. Vibration signals at the far end of the fiber are clearly detected and recovered, with a system noise floor of −42 dB rad 2 /Hz, a signal-to-noise ratio exceeding 30 dB before the optical signal enters the 50 km RFUT, and a 37 % improvement in vibration response range compared with conventional solid-core silica fiber. Benefiting from the combination of the excellent transmission properties of HCF and the high-resolution demodulation capability of LFM technology, this scheme achieves ultra-long sensing distance and extremely high spatial resolution. Notably, this scheme represents a unrepeatered remote Φ-OTDR scheme with a single-ended amplifier, offering a promising technical solution for applications such as deep-sea or deep-earth exploration, where construction conditions are harsh and both long sensing distance and high spatial resolution are strictly required.
Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.
Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Unrepeatered remote Φ-OTDR system with single-ended amplifier using hollow-core leading fiber
- Date Crossref
- 01/11/2026
- Éditeur
- Elsevier BV
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
-
Wuhan National Laboratory for Optoelectronics pays non établi dans la noticeStructure de recherche
-
Huazhong University of Science and Technology pays non établi dans la noticeUniversité ou école supérieure
-
Yangtze Optical Electronic (China) pays non établi dans la noticeEntreprise
-
State Grid Corporation of China (China) pays non établi dans la noticeEntreprise
-
Shenzhen University pays non établi dans la noticeUniversité ou école supérieure
-
School of Optical and Electronic Information Wuhan National Lab for Optoelectronics (WNLO) & National Engineering Laboratory for Next Generation Internet Access System pays non établi dans la noticeUniversité ou école supérieure
-
State Key Laboratory of Optical Fibre & Cable Manufacture Technology pays non établi dans la noticeStructure de recherche
-
State Grid Information & Telecommunication Center (Big Data Center) pays non établi dans la noticeInstitution
-
College of Physics and Optoelectronic Engineering pays non établi dans la noticeUniversité ou école supérieure
Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology et Yangtze Optical Electronic (China), avec 6 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.