Duplex fiber interferometer for acoustic wave sensing

Document Type : Original Article

Authors

Faculty of Basic Science, University of Mazandaran, Babolsar, Mazandaran, Iran

10.48308/piadm.2026.244123.1019

Abstract

Optical fiber sensors have played a significant role in the area of border security control and focal organization protection. In this article, a fiber Mach-Zehnder sensor based on the duplex fiber cable was proposed. Replacing two simplex fiber with duplex fiber cable in the Mach-Zehnder interferometer prevents the problem of fiber length mismatches in long fiber cable. The operating principle of the sensor is based on the fact that the acoustic wave induces strain in the fiber, and this strain changes the effective length or the refractive index of the fiber. As a result, the phase difference between the two arms changes, leading to a variation in the output light intensity of the interferometer. This intensity change is then detected and recorded by the photodetector. The acoustic wave with various frequencies was applied to the fiber cable, and the responses of the sensor were investigated. Then, a 150m cable was buried under the soil, and the intrusion effects were considered.

Keywords

Pioneering Advances in Materials
Volume 1, Issue 4
October 2026
Pages 46-57

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