Flat Broadband Chaos in Mutually Coupled Vertical-Cavity Surface-Emitting Lasers

Author

Yanhua Hong

Author_Institution

Sch. of Electron. Eng., Bangor Univ., Bangor, UK

Volume

21

Issue

6

fYear

2015

fDate

Nov.-Dec. 2015

Firstpage

1

Lastpage

7

Abstract

The flatness of chaos generated by mutually coupled vertical-cavity surface-emitting lasers (VCSELs) has been investigated experimentally in two configurations. Power variation between dc and the bandwidth frequency and flat bandwidth are used to quantitatively study the flatness of chaos. The power spectrum of chaos from a single VCSEL in both configurations is not flat due to a peak at relaxation oscillation frequency. This uneven nature will affect the application of chaos in random number generation. The experimental results show that the power spectra of chaos can easily be flattened by combining two uneven chaos. Flat bandwidth of the combined output can be 15 times higher than that of chaos from a single VCSEL at the optimum frequency detuning. The mechanism for this flattening is attributed to the frequency beating.

Keywords

laser cavity resonators; optical chaos; semiconductor lasers; surface emitting lasers; VCSEL; bandwidth frequency; flat broadband chaos; frequency beating; frequency detuning; mutually coupled vertical-cavity surface-emitting lasers; power spectrum; random number generation; relaxation oscillation frequency; Bandwidth; Chaos; Optical feedback; Spectral analysis; Vertical cavity surface emitting lasers; Chaos; feedback; mutual coupling; vertical cavity surface emitting laser;

fLanguage

English

Journal_Title

Selected Topics in Quantum Electronics, IEEE Journal of

Publisher

ieee

ISSN

1077-260X

Type

jour

DOI

10.1109/JSTQE.2015.2432020

Filename

7105861