Open AccessPhase-coded Brillouin optical correlation domain analysis with 2-mm resolution based on phase-shift keying
Author(s) -
Dexin Ba,
Yue Li,
Jie Yan,
Xiaopei Zhang,
Yongkang Dong
Publication year - 2019
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.27.036197
Subject(s) - optics , phase shift keying , phase modulation , pseudorandom binary sequence , physics , keying , brillouin zone , bandwidth (computing) , spatial light modulator , modulation (music) , telecommunications , binary number , computer science , phase noise , bit error rate , mathematics , acoustics , channel (broadcasting) , arithmetic
We report a phase-coded Brillouin optical correlation-domain analysis (BOCDA) based on phase-shift keying (PSK), in which the pseudo-random binary sequence (PRBS) phase coding is realized using a Mach-Zehnder modulator (MZM). Unlike the conventional phase-coded BOCDA using a phase modulator, which suffers from the non-rectangular transition in the encoded phase, the PSK can realize perfect phase switches between 0 and π with zero-width edges. It is not sensitive to the bandwidth of the modulator and the power of the radio-frequency modulation signal. Numerical simulations and experimental results prove that it can effectively suppress the Brillouin amplification in the off-peak positions. In experiment, a 2-mm spatial resolution sensing is realized using only a 20-GHz bandwidth MZM.