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Abstract
Long-range vibration sensing is an important tool for real-time structural health monitoring. A new, to the best of our knowledge, design of a distributed fiber-optic vibration sensor is introduced and experimentally demonstrated in this study. The proposed system utilizes the transmission of light in the forward direction for sensing, and a self-interference method for laser source simplification. To extract vibration information from phase modulation of light, two Mach–Zehnder interferometers (MZIs) are employed with a 3 × 3 coupler-based differential cross multiplication algorithm for phase calculation. A folded double-ended detection configuration allows the time-of-flight difference via cross correlation (CC) to provide vibration positioning. Experimental results demonstrate a sensing range of up to ∼80 km without optical amplification, accompanied by a position accuracy of 336 m.
© 2023 Optica Publishing Group
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George Y. Chen, Kuan Liu, Xing Rao, Yuhang Wang, Mamoona Khalid, Jun He, and Yiping Wang, "Long-range distributed vibration sensing using phase-sensitive forward optical transmission: publisher’s note," Opt. Lett. 48, 5967-5967 (2023)https://opg.optica.org/ol/abstract.cfm?uri=ol-48-22-5967
25 October 2023: A typographical correction was made to the funding section.
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