Open AccessAnalysis on Fourier characteristics of wavelength-scanned optical spectrum of low-finesse Fabry-Pérot acoustic sensor
Author(s) -
Xin Fu,
Peixiang Lu,
L Zhang,
Wenjun Ni,
D M Liu,
J S Zhang
Publication year - 2018
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.022064
Subject(s) - optics , finesse , fabry–pérot interferometer , signal (programming language) , sideband , fourier transform , interference (communication) , wavelength , modulation (music) , physics , phase modulation , frequency domain , time domain , compatible sideband transmission , materials science , phase noise , acoustics , computer science , telecommunications , radio frequency , channel (broadcasting) , quantum mechanics , computer vision , programming language
In this work, we investigate the Fourier characteristics of wavelength-scanned optical spectrum of low-finesse Fabry-Pérot (FP) acoustic sensor both theoretically and experimentally. The wavelength scanning will transform the time-domain acoustic signal into phase modulation loaded on the FP sensor spectrum distributed along wavelength. Therefore the interference spectrum can be regarded as carrier signal in the wavelength domain. From this perspective, it is intelligible that the phase modulation loaded on the spectrum (carrier signal) will introduce sidebands in Fourier domain. The spatial frequency and phase of sideband components contain unique information of both acoustic signal and the corresponding sensor. These conclusions are experimentally proved by single sensor head as well as two parallel sensors. The Fourier characteristics of sideband components can be utilized to recognize and distinguish acoustic signals received by different sensors, indicating that it has potential applications in multiplexed FP sensor array and source localization, and so forth.