Time-delay signature concealed broadband gain-coupled chaotic laser with fiber random grating induced distributed feedback. (January 2019)

• Record Type: Journal Article
• Authors: Xu, Yanping; Zhang, Liang; Lu, Ping; Mihailov, Steven; Chen, Liang; Bao, Xiaoyi
• Is Part Of: Optics & laser technology. Volume 109(2019)
• Page Start: 654
• Page End: 658
• Publication Date: 2019-01
• Subjects: Lasers -- Distributed-feedback -- Semiconductor lasers -- Instabilities and chaos; Optics -- Periodicals; Lasers -- Periodicals; Electronic journals; 621.366
• DOI: 10.1016/j.optlastec.2018.08.057
• Languages: English
• ISSNs: 0030-3992

Abstract

Highlights: A 7.53 GHz bandwidth chaotic laser system is achieved without time-delay signature. The fiber random grating feedback effectively conceals the time-delay signature. Laser injection is adopted to enhance the bandwidth of the chaotic laser. The chaotic laser can be used for random number generations and other applications. Abstract: A broadband chaotic laser with a flat power spectrum extending up to ∼7.53 GHz is achieved by injecting continuous wave laser light into a chaotic diode laser perturbed by fiber random grating induced distributed feedback, which forms a gain-coupled chaotic laser system. More than triple bandwidth enhancement is realized with appropriate frequency detuning between the master and slave lasers. Unlike normal chaotic lasers, the output from such a broadband chaotic laser is free from time-delay signature, which can be potentially applied for practical random number generations and will find useful applications in the fields of information security and computation systems.