Conceal Time Delay Signature of Chaos in Semiconductor Lasers With Dual-Path Injection

Author

Shui Ying Xiang ; Wei Pan ; Ai Jun Wen ; Nian Qiang Li ; Li Yue Zhang ; Lei Shang ; Hui Xing Zhang

Author_Institution

State Key Lab. of Integrated Service Networks, Xi´dian Univ., Xi´an, China

Volume

25

Issue

14

fYear

2013

fDate

15-Jul-13

Firstpage

1398

Lastpage

1401

Abstract

The time delay (TD) signatures of chaotic signals in semiconductor lasers (SLs) with dual-path injection (DPI) are investigated numerically and experimentally based on the autocorrelation function and the permutation entropy function, and are compared with those for chaotic signals in SLs with single-path injection (SPI). Both the intensity and phase chaos are considered. The regions of injection strength and frequency detuning contributing to TD concealment are identified. The optimal selection of injection delays for the DPI case is also suggested. It is found that, for both intensity and phase chaos, the TD signature for the DPI case can be better concealed in wider parameter regions than that for the SPI case, which is highly desirable for security-enhanced chaotic communication systems as well as high-speed random number generators based on chaotic SLs.

Keywords

delays; laser tuning; numerical analysis; optical chaos; optical communication equipment; semiconductor lasers; DPI; TD concealment; autocorrelation function; chaotic SL; chaotic signals; conceal time delay signature; dual-path injection; frequency detuning; high-speed random number generators; injection delays; injection strength; intensity chaos; numerical analysis; optimal selection; permutation entropy function; phase chaos; security-enhanced chaotic communication systems; semiconductor lasers; Semiconductor lasers; chaos; dual-path injection; time-delay signature;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2013.2266133

Filename

6523130