Performance of underwater wireless optical communication using Bessel beams and acousto-optic modulator

IF 3.5 2区 工程技术 Q2 OPTICS
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引用次数: 0

Abstract

Underwater wireless optical communication (UWOC) is adversely affected by the scattering of impurity particles and turbulence in seawater channels, causing signal quality degradation over long distances. Owing to their physical properties, Bessel beams exhibit anti-interference capabilities in complex seawater environment, highlighting their significant potential for underwater communication. Addressing the issues of high-speed modulation of Bessel beams and their limited non-diffracting range for underwater communication, this paper proposes a UWOC system using Bessel beams and an acousto-optic modulator (AOM). The modulation speed is enhanced by adjusting the beam's focal distance to achieve a transmission rate of at least 20 Mbps. A telescope system was designed to extend the non-diffracting distance of the Bessel beam to 30 m. Experiments were conducted to compare and analyze the changes in the characteristics of the Bessel and Gaussian beam spots under different conditions of chlorophyll solution and temperature. It was confirmed that Bessel beams in this system exhibit superior turbulence and scattering resistance compared to Gaussian beams. Moreover, an in-depth analysis was conducted on how chlorophyll solutions and thermal gradients affect the signal characteristics of Bessel beams. The results show that at the same chlorophyll concentration, the bit error rate increases linearly with the signal rate; under the same thermal gradient, they are inversely proportional. This system validates the feasibility of using Bessel beams in underwater communication, exploiting their potential and offering a new direction for the development of UWOC systems.

使用贝塞尔波束和声光调制器的水下无线光通信性能
水下无线光通信(UWOC)会受到海水信道中杂质颗粒散射和湍流的不利影响,导致长距离信号质量下降。由于其物理特性,贝塞尔波束在复杂的海水环境中表现出抗干扰能力,凸显了其在水下通信中的巨大潜力。针对贝塞尔波束的高速调制及其在水下通信中有限的非衍射范围,本文提出了一种使用贝塞尔波束和声光调制器(AOM)的 UWOC 系统。通过调整光束的焦距来提高调制速度,从而实现至少 20 Mbps 的传输速率。实验比较和分析了贝塞尔光束和高斯光束光斑在不同叶绿素溶液和温度条件下的特性变化。实验证实,与高斯光束相比,该系统中的贝塞尔光束具有更强的抗湍流和抗散射能力。此外,还深入分析了叶绿素溶液和热梯度如何影响贝塞尔光束的信号特征。结果表明,在相同的叶绿素浓度下,误码率与信号率呈线性增长;在相同的热梯度下,两者成反比。该系统验证了在水下通信中使用贝塞尔波束的可行性,挖掘了贝塞尔波束的潜力,为开发 UWOC 系统提供了新的方向。
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来源期刊
Optics and Lasers in Engineering
Optics and Lasers in Engineering 工程技术-光学
CiteScore
8.90
自引率
8.70%
发文量
384
审稿时长
42 days
期刊介绍: Optics and Lasers in Engineering aims at providing an international forum for the interchange of information on the development of optical techniques and laser technology in engineering. Emphasis is placed on contributions targeted at the practical use of methods and devices, the development and enhancement of solutions and new theoretical concepts for experimental methods. Optics and Lasers in Engineering reflects the main areas in which optical methods are being used and developed for an engineering environment. Manuscripts should offer clear evidence of novelty and significance. Papers focusing on parameter optimization or computational issues are not suitable. Similarly, papers focussed on an application rather than the optical method fall outside the journal''s scope. The scope of the journal is defined to include the following: -Optical Metrology- Optical Methods for 3D visualization and virtual engineering- Optical Techniques for Microsystems- Imaging, Microscopy and Adaptive Optics- Computational Imaging- Laser methods in manufacturing- Integrated optical and photonic sensors- Optics and Photonics in Life Science- Hyperspectral and spectroscopic methods- Infrared and Terahertz techniques
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