Open AccessObservation of flat chaos generation using an optical feedback multi-mode laser with a band-pass filter
Author(s) -
Pu Li,
Qiang Cai,
Jianguo Zhang,
Bingjie Xu,
Yiming Liu,
Adonis Bogris,
K.A. Shore,
Yuncai Wang
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.27.017859
Subject(s) - optics , broadband , physics , bandwidth (computing) , laser , chaotic , filter (signal processing) , semiconductor laser theory , optical filter , telecommunications , computer science , artificial intelligence , computer vision
We demonstrate experimentally that flat and broadband chaotic signals can be easily generated by combining a multi-mode laser diode subject to optical feedback with a band-pass filter. Measurements are made of the RF spectra of multi-mode and single-mode outputs from an external cavity Fabry-Perot (FP) semiconductor laser before and after the filtering procedure. In this way it is found that in the chaos regime the low-frequency energy of the single-mode output is enhanced by about 25 dB comparing with that of the multi-mode output. Moreover, the associated 3-dB chaos bandwidth can reach around 6 GHz for the single mode case. Numerical demonstrations show mode competition is the physical origin of the low-frequency enhancement in the single-mode chaotic outputs.