Open AccessBrillouin optical correlation-domain reflectometry based on arbitrary waveform modulation: a theoretical study
Author(s) -
Kohei Noda,
Heeyoung Lee,
Kentaro Nakamura,
Yosuke Mizuno
Publication year - 2021
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.422873
Subject(s) - waveform , optics , reflectometry , phase modulation , modulation (music) , brillouin zone , frequency modulation , intensity modulation , physics , beat (acoustics) , computer science , time domain , telecommunications , acoustics , bandwidth (computing) , phase noise , radar , computer vision
We put forward a new theory on Brillouin optical correlation-domain reflectometry (BOCDR) based on arbitrary waveform modulation. We derive a universal representation for the spatial resolution using the foot convexity of the beat spectrum. This result well explains the previous results based on sinusoidal modulation, and thus our theory is the consistent extension of the conventional theory on BOCDR. This representation is also applicable to the spatial resolution evaluation of more complicated modulation schemes, such as the combined use of intensity and frequency modulations even with some phase delay. We also discuss what kinds of modulation waveforms should not be employed for distributed measurement to ensure high spatial resolution.