Control of optical chaos spectrum in semiconductor laser for secure RoF communication

IF 0.7 4区物理与天体物理 Q4 OPTICS

Optica Applicata Pub Date : 2022-01-01 DOI:10.37190/oa220401

Danish Ali Mazhar, Syed Zafar Ali, Muhammad Khawar Islam

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引用次数: 0

Abstract

A critical requirement in optical chaos based secure radio over fiber (RoF) system design is the ability to control center frequency, spectral bandwidth, power level and signature of chaos to submerge message with sufficient horizontal and vertical margins both in time and frequency domains. Once frequency domain masking is completely achieved, time domain masking is met automatically, the former being more stringent. In a direct modulated semiconductor laser, the three control parameters are bias current (Ibias), modulation current (Imod) and modulation frequency (ωa). It is found that Imod increases bandwidth and amplitude dynamic range of chaotic pulses. Ibias increases the cavity power and hence average peak amplitude of laser chaotic pulses. The modulation frequency increases the speed of overall cavity dynamics and hence is used to increase the bandwidth of chaos but a corresponding increase in bias and modulation currents is required to support high repetition pulses. The results show relationship between three control parameters (bias current, modulation current and modulation frequency) in a direct modulated semiconductor laser and optical chaos bandwidth using regression.

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半导体激光器混沌谱的安全RoF通信控制

基于光混沌的光纤安全无线电(RoF)系统设计的一个关键要求是能够控制混沌的中心频率、频谱带宽、功率电平和特征，从而在时域和频域具有足够的水平和垂直裕度。一旦完全实现频域掩模，则自动满足时域掩模，前者更为严格。在直接调制半导体激光器中，三个控制参数是偏置电流(Ibias)、调制电流(Imod)和调制频率(ωa)。发现Imod增加了混沌脉冲的带宽和幅度动态范围。Ibias增加了腔功率，从而增加了激光混沌脉冲的平均峰值幅度。调制频率提高了整体腔动力学的速度，因此用于增加混沌的带宽，但需要相应增加偏置和调制电流来支持高重复脉冲。结果表明，直接调制半导体激光器的三个控制参数(偏置电流、调制电流和调制频率)与光混沌带宽之间存在回归关系。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Optica Applicata 物理-光学

CiteScore

1.00

自引率

16.70%

发文量

审稿时长

4 months

期刊介绍： Acoustooptics, atmospheric and ocean optics, atomic and molecular optics, coherence and statistical optics, biooptics, colorimetry, diffraction and gratings, ellipsometry and polarimetry, fiber optics and optical communication, Fourier optics, holography, integrated optics, lasers and their applications, light detectors, light and electron beams, light sources, liquid crystals, medical optics, metamaterials, microoptics, nonlinear optics, optical and electron microscopy, optical computing, optical design and fabrication, optical imaging, optical instrumentation, optical materials, optical measurements, optical modulation, optical properties of solids and thin films, optical sensing, optical systems and their elements, optical trapping, optometry, photoelasticity, photonic crystals, photonic crystal fibers, photonic devices, physical optics, quantum optics, slow and fast light, spectroscopy, storage and processing of optical information, ultrafast optics.