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The effects of scaling and bends in a fiber‐optic modalmetric acoustic detector
Author(s) -
Freitas Taiane A. M. G.,
Ribeiro Ricardo M.
Publication year - 2021
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.32646
Subject(s) - optics , detector , multi mode optical fiber , interferometry , materials science , sensitivity (control systems) , wavelength , optical fiber , acoustics , acoustic wave , distributed acoustic sensing , scaling , fiber optic sensor , physics , electronic engineering , engineering , geometry , mathematics
This report describes a simple and very sensitive modal interferometer (modalmetric) opto‐acoustic detector primarily thought for digital acoustic communications. The modalmetric device was made from a single‐mode fiber spliced with a sensitive multimode fiber (s‐MMF) strand. A nonlinear increase of the phase‐shift and a higher effective sensitivity of the device were observed when the interaction length of the s‐MMF in contact with the surface receiving acoustic signals was increased from 5 to 25 cm and also when the s‐MMF was bent— scaling and bend effects. A sensitivity increase of 14.2 dB was measured for very weak acoustic signals caused by at least three interfering modes. All tests in the proof‐of‐principle basis were performed at 42.9 kHz carrier frequency and 1550 nm wavelength.