Time-delay signature characteristics of the chaotic output from an optoelectronic oscillator by introducing an optical feedback

doi:10.1007/s12200-019-0960-z

Front. Optoelectron.

2020, Vol. 13

Issue (4) : 402-408 https://doi.org/10.1007/s12200-019-0960-z

RESEARCH ARTICLE

Time-delay signature characteristics of the chaotic output from an optoelectronic oscillator by introducing an optical feedback

Xixuan LIU, Xi TANG, Zhengmao WU, Guangqiong XIA(

)

School of Physical Science and Technology, Southwest University, Chongqing 400715, China

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Abstract

In this work, via autocorrelation function (ACF) and permutation entropy (PE) methods, we numerically investigate the time-delay signature (TDS) characteristics of the chaotic signal output from an optoelectronic oscillator (OEO) after introducing an extra optical feedback loop. The results demonstrate that, for such a chaotic system, both the optoelectronic feedback with a delay time of T₁ and the optical feedback with a delay time of T₂ contribute to the TDS of generated chaos. The TDS of the chaotic signal should be evaluated within a large time window including T₁ and T₂ by the strongest peak in the ACF curve of the chaotic signal, and the strongest peak may locate at near T₁ or T₂. Through mapping the evolution of the TDS in the parameter space of the optical feedback strength and time, certain optimized parameter regions for achieving a chaotic signal with a relatively weak TDS can be determined.

Keywords optoelectronic oscillator (OEO) chaotic output time-delay signature (TDS) optical feedback

Corresponding Author(s): Guangqiong XIA

Just Accepted Date: 10 October 2019 Online First Date: 05 December 2019 Issue Date: 31 December 2020

Cite this article:

Xixuan LIU,Xi TANG,Zhengmao WU, et al. Time-delay signature characteristics of the chaotic output from an optoelectronic oscillator by introducing an optical feedback[J]. Front. Optoelectron., 2020, 13(4): 402-408.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-019-0960-z
https://academic.hep.com.cn/foe/EN/Y2020/V13/I4/402

Fig.1 Schematic diagram of a chaotic signal generation based on an OEO after introducing an extra optical feedback. LD: laser diode; FC: fiber coupler; PC: polarization controller; MZM: Mach-Zehnder modulator; DL: delay line; PD: photodetector; RFA: radio frequency amplifier; VA: variable attenuator

Fig.2 (a) Time series, (b) power spectra, (c) zoom-in power spectra, (d) ACF curves and (e) PE curves of the chaotic signal from an OEO after introducing an extra optical feedback with T₁ = 30 ns and T₂ = 25 ns, where the first, second, third and fourth rows represent an optical feedback strength K of 0, 0.2, 0.5 and 0.8, respectively

Fig.3 (a) Calculated map of ACF curves for T₁ = 30 ns and T₂ = 25 ns with K varied from 0 to 1 and the expanded versions of the ACF curve at the vicinities of (b) T₂ and (c) T₁, respectively

Fig.4 (a) Dependence of s on the optical feedback strength K under P₀ = 5 mW; (b) dependence of K_optimal on the laser power P₀ and corresponding s_min under fixed P₀ and K_optimal

Fig.5 Calculated map of s in the parameter space of T₂ and K under T₁ = 30 ns

Fig.6 Calculated map of s in the parameter space of T₁ and T₂ under K = 0.55

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