Open AccessVariable-frequency lock-in detection for the suppression of beat noise in Brillouin optical correlation domain analysis
Author(s) -
Ji Ho Jeong,
Kwanil Lee,
Kwang Yong Song,
Je–Myung Jeong,
Sang Bae Lee
Publication year - 2011
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.19.018721
Subject(s) - beat (acoustics) , optics , brillouin zone , brillouin scattering , frequency domain , physics , domain analysis , noise (video) , frequency modulation , phase noise , time domain , optical fiber , radio frequency , computer science , telecommunications , software construction , software , artificial intelligence , software system , image (mathematics) , computer vision , programming language
We propose and experimentally demonstrate a novel lock-in detection method to avoid a beat noise in Brillouin optical correlation domain analysis (BOCDA) which appears in the sweep of the sensing position and deteriorates the measurement accuracy by distorting the acquired Brillouin gain spectrum. In our analysis, the origin of the beat noise is shown to be the fluctuation of the Brillouin gain induced by the chopping of the intensity-modulated pump wave, and the optimal relation between the modulation and the lock-in frequencies is developed as an effective solution to circumvent the beat noise.