The effects of scaling and bends in a fiber‐optic modalmetric acoustic detector

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...

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Bibliographic Details
Published in:Microwave and optical technology letters 2021-02, Vol.63 (2), p.708-713
Main Authors: Freitas, Taiane A. M. G., Ribeiro, Ricardo M.
Format: Article
Language:English
Subjects:
acoustic communications
acoustic monitoring
Acoustics
Bends
Carrier frequencies
modal interferometer
modalmetric
opto‐acoustic receiver
Sensitivity
ultrasound
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Summary: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.
ISSN:0895-2477
1098-2760
DOI:10.1002/mop.32646