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Single-mode–multimode–single-mode (SMS) structure is demonstrated as a strain sensor. The device is fabricated by splicing a section of multimode optical fiber (MMF) in between single-mode fibers (SMFs). The modal interference inside the structure produces a strong resonant transmission notch, which is sensitive to external perturbation. It was found that the position of the notch changed with strain at sensitivity of 1.3 nm/N. The device introduced here is simple to fabricate, robust and suitable for high temperature operation; hence, it is adequate for diverse sensing applications..
Strain sensor, Optical interferometer, Multimode interference.
N. M. AZMI, N. H. YUSOF, Z. JUSOH, H. A. RAZAK, S. W. HARUN, Robust strain sensor based on multimode interference in single-mode–multimode–single-mode fiber structure, Optoelectronics and Advanced Materials - Rapid Communications, 12, 5-6, May-June 2018, pp.272-274 (2018).
Submitted at: Nov. 16, 2017
Accepted at: June 7, 2018