Open AccessGeneration of flat wideband chaos with suppressed time delay signature by using optical time lens
Author(s) -
Ning Jiang,
Chao Wang,
Chenpeng Xue,
Guilan Li,
Shuqing Lin,
Kun Qiu
Publication year - 2017
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.25.014359
Subject(s) - optics , wideband , physics , lens (geology) , chaotic , phase modulation , signal (programming language) , bandwidth (computing) , oscillation (cell signaling) , signature (topology) , dispersion (optics) , optical chaos , semiconductor laser theory , laser , phase noise , computer science , telecommunications , mathematics , geometry , artificial intelligence , biology , genetics , programming language
We propose a flat wideband chaos generation scheme that shows excellent time delay signature suppression effect, by injecting the chaotic output of general external cavity semiconductor laser into an optical time lens module composed of a phase modulator and two dispersive units. The numerical results demonstrate that by properly setting the parameters of the driving signal of phase modulator and the accumulated dispersion of dispersive units, the relaxation oscillation in chaos can be eliminated, wideband chaos generation with an efficient bandwidth up to several tens of GHz can be achieved, and the RF spectrum of generated chaotic signal is nearly as flat as uniform distribution. Moreover, the periodicity of chaos induced by the external cavity modes can be simultaneously destructed by the optical time lens module, based on this the time delay signature can be completely suppressed.