paper 150203051051

Published: 2015-07-09

Chaos Generation Utilizing Optically Square-wave-injected Semiconductor Lasers

Chen-Wei Fu,

Chen-Wei Fu

Yuan Ze University, Taiwan

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Yu-Shan Juan,

Yu-Shan Juan

Yuan Ze University, Taiwan

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Shao-Wei Peng

Yuan Ze University, Taiwan

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Proceedings of 2015 Photonics & Electromagnetics Research Symposium, Prague, July 6 - 9，Page(s)69-72

Abstract

Benefiting from a non-zero value of the linewidth enhancement factor which leads to a variety of dynamics different from any other lasers, the broad bandwidth of chaos can be easily generated. There are several applications in chaotic laser, such as broadband random-bit generation, ranging, and secured communications. In the past two decays, most studies of the chaos generations focused on the nonlinear dynamics of the traditional continuous wave (cw) injection and dynamical pulse and sine wave injection. In this work, we study chaos generation utilizing an optically square-wave-injected semiconductor laser with tunable duty cycle. By injecting a slave laser with periodic optical square-wave at specific parameters, chaos oscillation and chaos pulsing can be generated individually. Compared with continuous wave injection with the same injected conditions, the chaos oscillation generated by square-wave injection shows larger bandwidth and more complex behaviors. Furthermore, if the operating variables are adjusted to the center of the chaos area in the dynamical mapping, the waveforms of power spectra of the generated chaos are much smoother and broader. In this paper, the distribution map of chaos oscillation and pulsing oscillation are investigated. When the duty cycle is operated at high level, chaos oscillation is observed. On the other hand, if we operate the condition at high repetition rate and strong injection strength, nonlinear dynamics is driven into the chaos pulsing states and the bandwidth of chaos pulsing is two times larger than chaos oscillation which is operated in week injection strength. The three parameters, duty cycle, repetition rate, and injection strength, all play important roles in chaos generation utilizing optical square-wave injection system.

Citation

Chen-Wei Fu, Yu-Shan Juan, and Shao-Wei Peng, "Chaos Generation Utilizing Optically Square-wave-injected Semiconductor Lasers," Proceedings of 2015 Photonics & Electromagnetics Research Symposium, Prague, July 6 - 9，Page(s)69-72

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