Optics and Laser Technology最新文献_第4页

Development of highly sensitive and stable patterned PDMS flexible strain sensors for motion monitoring via laser direct writing 通过激光直写技术开发用于运动监测的高灵敏度、高稳定性图案化 PDMS 柔性应变传感器

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2024-11-26 DOI: 10.1016/j.optlastec.2024.112212

Zhaoyan Li , Xiaozhu Xie , Jincheng Xiao , Yizhi Zeng , Yajun Huang

Flexible strain sensors have received widespread attention for their potential applications in wearables, human–computer interaction, and healthcare. However, achieving a good balance between sensitivity, stretchability, and stability remains challenging. Here, we report a cost-effective and scalable fabrication strategy that combines laser direct writing (LDW) with 3D printing (3DP) to prepare various patterned Polydimethylsiloxane (P-PDMS) flexible strain sensors. By varying the laser parameters and processing paths, different microstructured patterns can be obtained, which significantly influence the sensor’s performance. By introducing patterned composite microstructures, the sensitivity of the strain sensor was increased by 339 % compared to the sensor without surface structures. Additionally, the strain sensors exhibit high stability and durability, a fast response time (140 ms), low hysteresis (0.009), and an ultra-low detection limit (0.0125 % strain). Besides, the sensors demonstrate excellent electrical performance and thermal stability. Based on their superior performance, we demonstrated their capability for real-time monitoring of human physiological signals. These findings successfully illustrate the potential of laser processing in fabricating complex microstructures, enabling the development of high-sensitivity flexible strain sensors for applications such as wearable health monitoring and human–computer interaction.

柔性应变传感器因其在可穿戴设备、人机交互和医疗保健领域的潜在应用而受到广泛关注。然而，要在灵敏度、可拉伸性和稳定性之间取得良好的平衡仍然具有挑战性。在此，我们报告了一种具有成本效益且可扩展的制造策略，该策略将激光直写（LDW）与三维打印（3DP）相结合，制备出各种图案化的聚二甲基硅氧烷（P-PDMS）柔性应变传感器。通过改变激光参数和加工路径，可以获得不同的微结构图案，从而显著影响传感器的性能。通过引入图案化复合微结构，应变传感器的灵敏度比无表面结构的传感器提高了 339%。此外，应变传感器还具有高稳定性和耐用性、快速响应时间（140 毫秒）、低滞后（0.009）和超低检测限（0.0125 % 应变）。此外，传感器还具有出色的电气性能和热稳定性。基于其卓越的性能，我们展示了其实时监测人体生理信号的能力。这些研究成果成功地说明了激光加工在制造复杂微结构方面的潜力，使高灵敏度柔性应变传感器的开发成为可能，可应用于可穿戴健康监测和人机交互等领域。

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引用次数: 0

Kerr-lens mode-locked Yb:YAG ring-cavity thin-disk oscillator switchable between unidirectional and bidirectional operations 可在单向和双向操作之间切换的克尔透镜锁模 Yb:YAG 环腔薄盘振荡器

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2024-11-26 DOI: 10.1016/j.optlastec.2024.112167

Heyan Liu , Qingzhe Cui , Tingting Yang, Jingjie Hao, Hongshan Chen, Hongyu Liu, Shenao Zhang, Lisong Yan, Jinwei Zhang

Femtosecond ring cavity thin disk oscillators combine high power with the flexibility switching output either unidirectionally and bidirectionally. Here, we report a Kerr lens mode-locked Yb:YAG ring cavity thin disk oscillator switchable between unidirectional and bidirectional operations by adjusting the position and parameters of the device in the cavity. The average power and pulse width of these are closing to 20 W and below 400 fs, respectively. Additionally, we present a numerical simulation to provide guidance for finding mode-locked regions and measure the repetition rates of bidirectional pulses, exploring the mechanism of the difference in repetition rates in the ring cavity. These results lay the foundation for generating a high-power near-infrared double optical frequency comb, as well as for the development of a mid-infrared optical frequency comb.

飞秒环腔薄盘振荡器兼具高功率和单向与双向输出切换的灵活性。在此，我们报告了一种克尔透镜锁模的 Yb:YAG 环形腔薄盘振荡器，通过调整腔内器件的位置和参数，可在单向和双向操作之间进行切换。其平均功率和脉冲宽度分别接近 20 W 和低于 400 fs。此外，我们还进行了数值模拟，为寻找锁模区提供指导，并测量了双向脉冲的重复率，探索了环形腔中重复率差异的机理。这些结果为产生高功率近红外双光频梳以及开发中红外光频梳奠定了基础。

引用次数: 0

Reliable wavelength detection method of sapphire fiber Bragg gratings using added multimode fiber 使用添加多模光纤的蓝宝石光纤布拉格光栅的可靠波长检测方法

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2024-11-26 DOI: 10.1016/j.optlastec.2024.112185

Zhuoda Li , Qingming Tan , Ziheng Yan , Jia He , Bin Du , Xizhen Xu , Shen Liu , Changrui Liao , Zhiyong Hu , Libo Gao , Yiping Wang , Jun He

Sapphire fiber Bragg gratings (SFBGs) are promising high-temperature sensors, which can be applied to measure temperature and strain in extreme environments. However, the multimode operation of SFBGs is susceptible to disturbance, leading to unreliable wavelength detection. Here, we propose by using added multimode fibers (AMMF) and tracing the longwave edge of reflection envelope to enhance the stability of wavelength detection for SFBG. The near-field profiles of transmission modes are investigated in sapphire fiber with different lengths of AMMF. It is found that the mode-field distribution of sapphire fiber can be improved by using AMMF with a length of 1000 m, which results in a reduction of relative standard deviation (RSD) from 57 % to 10 %. Then, the signal-to-noise ratio (SNR) in the reflection spectrum of SFBG is improved to 16 dB by polishing inclined end faces of sapphire fiber using the removal mechanism of hard-brittle materials. Furthermore, we detect the wavelengths of both the longwave edge and peak on the reflection envelope, which reveals lower fluctuations (i.e., SD = 0.02 nm) of the longwave edge, since lower-order modes are more stable during transmission. The effect of external disturbances (i.e., torsion and vibration) on demodulation of SFBG is also evaluated, with a maximum fluctuation of 0.06 nm (SD = 0.01 nm). A temperature experiment is carried out with the assembly and polynomial fitting curves with high fitness are obtained. Thus, our proposed methods enhance the reliability of wavelength detection in the reflection spectrum of SFBG, which is beneficial to improving the sensing performance of SFBG-based sensors.

蓝宝石光纤布拉格光栅（SFBG）是一种前景广阔的高温传感器，可用于测量极端环境中的温度和应变。然而，蓝宝石光纤布拉格光栅的多模操作容易受到干扰，导致波长检测不可靠。在此，我们提出使用添加多模光纤（AMMF）和追踪反射包络的长波边缘来增强 SFBG 波长检测的稳定性。我们研究了不同长度 AMMF 的蓝宝石光纤中传输模式的近场剖面。研究发现，使用长度为 1000 米的 AMMF 可以改善蓝宝石光纤的模场分布，从而将相对标准偏差（RSD）从 57% 降低到 10%。然后，利用硬脆材料的去除机制对蓝宝石光纤的倾斜端面进行抛光，可将 SFBG 反射光谱的信噪比（SNR）提高到 16 dB。此外，我们还检测了反射包络上长波边缘和峰值的波长，发现长波边缘的波动较小（即 SD = 0.02 nm），因为低阶模式在传输过程中更为稳定。还评估了外部干扰（即扭转和振动）对 SFBG 解调的影响，最大波动为 0.06 nm（SD = 0.01 nm）。对组件进行了温度实验，得到了拟合度很高的多项式拟合曲线。因此，我们提出的方法提高了 SFBG 反射光谱中波长检测的可靠性，有利于改善基于 SFBG 的传感器的传感性能。

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引用次数: 0

Effects of different interlayer bonding modes on the microstructure and properties of laser cladded In625 不同层间结合模式对激光包覆 In625 的微观结构和性能的影响

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2024-11-26 DOI: 10.1016/j.optlastec.2024.112191

Yingying Zhang, Jiayu Sun, Zhengyu Sun, Yiqi Wang, Tianbiao Yu

In this study, the effects of five different interlayer bonding modes on the microstructure, mechanical properties, friction, and wear resistance of In625 laser cladding were investigated. XRD, EDS, tensile, hardness, friction and wear tests were conducted. XRD analysis results have revealed that Nb₆C₅ was detected in rectangular ring mode and the long, wide and rectangular ring overlay mode, indicating that the rectangular ring mode may promote the formation of secondary phase. EDS analysis has indicated a slightly higher Nb content in the rectangular ring mode, while the long and wide direction overlay mode exhibited a more uniform grain distribution and smaller grain size. Tensile tests revealed ductile fractures in the long direction, wide direction, the long and wide direction overlay modes, while the rectangle ring mode and the long, wide, and rectangular ring overlay modes showed brittle fractures. The long and wide direction overlay mode had the highest average elongation (35.46 %), and the long, wide, and rectangular ring overlay mode had the highest tensile strength (957.13 MPa). Hardness test results showed that the rectangle ring mode had the highest hardness (325.1 HV (0.2)). Friction and wear tests indicated that the long and wide direction overlay mode exhibited the smallest wear volume (0.08899 mm³) and the best overall friction performance. These findings indicate that the properties of the cladding layer can be effectively tailored by selecting appropriate interlayer bonding modes to match the specific material requirements in distinct application scenarios.

本研究探讨了五种不同的层间结合模式对 In625 激光熔覆层的微观结构、机械性能、摩擦和耐磨性的影响。研究人员进行了 XRD、EDS、拉伸、硬度、摩擦和磨损测试。XRD 分析结果表明，在矩形环模式以及长、宽和矩形环叠加模式中均检测到 Nb6C5，这表明矩形环模式可能会促进次生相的形成。EDS 分析表明，矩形环模式中的铌含量略高，而长环和宽环叠加模式的晶粒分布更均匀，晶粒尺寸更小。拉伸试验显示，长方向、宽方向、长方向和宽方向叠加模式出现韧性断裂，而矩形环模式以及长方向、宽方向和矩形环叠加模式则出现脆性断裂。长方向和宽方向叠加模式的平均伸长率最高（35.46 %），长方形、宽方形和矩形环叠加模式的抗拉强度最高（957.13 兆帕）。硬度测试结果表明，矩形环模式的硬度最高（325.1 HV (0.2)）。摩擦和磨损测试表明，长宽方向堆焊模式的磨损体积（0.08899 立方毫米）最小，整体摩擦性能最佳。这些研究结果表明，通过选择适当的层间结合模式，可以有效地定制堆焊层的性能，以满足不同应用场景中的特定材料要求。

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引用次数: 0

Sparse holographic tomography reconstruction method based on self-supervised neural network with learning to synthesize strategy 基于学习合成策略的自监督神经网络稀疏全息断层成像重建方法

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2024-11-26 DOI: 10.1016/j.optlastec.2024.112028

Yakun Liu, Wen Xiao, Feng Pan

This research proposes a novel method for sparse digital holographic tomography reconstruction. Due to the limitations of numerical aperture and sampling time, the development of a high-precision sparse digital holographic tomography reconstruction techniques is necessitated. Our main innovation is the developing a composite coordinate-based implicit neural network with learning to synthesize strategy. It addresses the information limitations of limited angle by directly mapping the sample’s rotation angle and coordinates to the phase images, allowing for the prediction of phase images at unmeasured angles without requiring external training dataset. Furthermore, it avoids the issue of high-frequency suppression caused by the uneven distribution of frequency information in the images and the network’s characteristics using separately processing low-frequency and high-frequency information in different channels, resulting in higher fidelity of the predicted phase images and the tomographic results. We validated the effectiveness of the proposed method on four different fiber structures at various sampling intervals. This method provides a new perspective for tomographic reconstruction at sparse angles.

这项研究提出了一种新的稀疏数字全息层析成像重建方法。由于数值孔径和采样时间的限制，有必要开发一种高精度稀疏数字全息层析重建技术。我们的主要创新是开发了一种基于学习合成策略的复合坐标隐式神经网络。它通过将样本的旋转角度和坐标直接映射到相位图像，解决了有限角度的信息限制问题，从而无需外部训练数据集即可预测未测量角度的相位图像。此外，它还避免了因图像中频率信息分布不均而导致的高频抑制问题，并利用网络的特点，在不同通道中分别处理低频和高频信息，从而使预测的相位图像和断层扫描结果具有更高的保真度。我们在不同采样间隔的四种不同光纤结构上验证了所提方法的有效性。这种方法为稀疏角度下的层析成像重建提供了新的视角。

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引用次数: 0

Investigation on the impact of thermal softening effect induced by nanosecond pulsed laser-assisted cutting on the deformation mechanism of SiCp/Al composites 纳秒脉冲激光辅助切割引起的热软化效应对 SiCp/Al 复合材料变形机制影响的研究

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2024-11-26 DOI: 10.1016/j.optlastec.2024.112166

Mingshuo Kang, Yan Gu, Jieqiong Lin, Tianyu Gao, Tuo Wang, Yunlong Luan, Jiaxin Zhao

The machining of SiCp/Al composites containing high hardness SiC particles poses a significant challenge. The nanosecond pulsed laser-assisted cutting method has been selected to improve the machinability of SiCp/Al composites with a volume fraction of 45%. User-written subroutine is used to establish two dimensional and three dimensional cutting simulation models. The deformation mechanism of the Al matrix and SiC particles in SiCp/Al composites is investigated using cutting simulation, digital image correlation (DIC) experiments, and nanosecond pulsed laser-assisted cutting experiments. The effect of the various pulsed laser parameters on the surface quality of the workpiece is also investigated. The simulation and experimental results demonstrate that the damage of SiC particles and their arrangement hinder the plastic deformation of the Al matrix, and the nanosecond pulsed laser induces thermal softening effect and improve the plastic deformation of the Al matrix. Compared to the conventional cutting, the SiC particles exhibit a denser arrangement within the chip, and the plastic deformation of the Al matrix governs the chip deformation. The aim of this present study is to enhance the plastic deformation of the Al matrix, mitigate damage to SiC particles, improve the arrangement of SiC particles, and reduce the surface roughness of the workpiece in order to enhance the machinability of SiCp/Al composites.

加工含有高硬度 SiC 颗粒的 SiCp/Al 复合材料是一项重大挑战。为了提高体积分数为 45% 的 SiCp/Al 复合材料的可加工性，我们选择了纳秒脉冲激光辅助切割方法。使用用户编写的子程序建立了二维和三维切割模拟模型。利用切割模拟、数字图像相关（DIC）实验和纳秒脉冲激光辅助切割实验研究了 SiCp/Al 复合材料中 Al 基体和 SiC 颗粒的变形机制。此外，还研究了各种脉冲激光参数对工件表面质量的影响。模拟和实验结果表明，SiC 颗粒的损伤及其排列阻碍了铝基体的塑性变形，而纳秒脉冲激光诱导了热软化效应，改善了铝基体的塑性变形。与传统切割相比，SiC 颗粒在芯片内的排列更密集，铝基体的塑性变形控制着芯片的变形。本研究的目的是增强铝基体的塑性变形，减轻对 SiC 颗粒的损伤，改善 SiC 颗粒的排列，降低工件的表面粗糙度，从而提高 SiCp/Al 复合材料的可加工性。

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引用次数: 0

Electro-optically addressable and rewritable transparent liquid crystal bistable waveguide display devices 电光寻址和可重写透明液晶双稳态波导显示装置

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2024-11-26 DOI: 10.1016/j.optlastec.2024.112165

Pravinraj Selvaraj , Yuan-Chang Tsai , Chun-Ting Wu, Chi-Tang Huang, Cheng-Kai Liu, Ko-Ting Cheng

Soft functional materials are in high demand to develop novel devices with excellent dynamic performances because they respond to specific stimuli with distinct functions. Here, we have examined sodium dodecyl sulfonate (SDS) ions doped into negative cholesteric liquid crystals (CLCs), employing an optically sensitive poly(N-vinyl carbazole) (PVK) film on ITO substrates for demonstrating a bistable light waveguide display device. The coated PVK film has the potential to block direct current (DC) electric fields and transform an insulator into a conductor when exposed to suitable ultraviolet (UV) stimuli, thus achieving pattern-addressing through the utilization of dynamic scattering of liquid crystals (LCs). Hence, the sample exhibits text pattern scattering and remains transparent under patterned UV stimuli. Initially, an external stimulus DC field was applied to the CLC cell to switch the planar textures in the region shining with UV light to focal conic textures that remain prolonged even after stimulus removal. Then, we examine the novel concept of a voltage-free “remote writing display” using transparent bistable waveguides displays by edge-lit white LED stimuli. Such advanced transparent displays offer robust stability, manufacturability, and cost-effectiveness for various applications in different environments and industries, such as automotive, e-paper, and augmented reality devices.

软功能材料具有独特的功能，可对特定刺激做出反应，因此在开发具有卓越动态性能的新型器件方面需求量很大。在此，我们研究了掺入负胆固醇液晶（CLC）的十二烷基磺酸钠（SDS）离子，并在 ITO 基底上使用了光学敏感的聚（N-乙烯基咔唑）（PVK）薄膜，以演示双稳态光波导显示装置。涂覆的 PVK 薄膜具有阻挡直流电场的潜力，在适当的紫外线（UV）刺激下可将绝缘体转变为导体，从而通过利用液晶（LC）的动态散射实现图案处理。因此，在图案化紫外线刺激下，样品表现出文字图案散射并保持透明。首先，在 CLC 单元上施加外部刺激直流场，将紫外线照射区域的平面纹理切换为焦点圆锥纹理，即使在刺激移除后，这些纹理仍会保持较长的时间。然后，我们研究了无电压 "远程书写显示 "的新概念，即使用透明双稳态波导显示边缘发光的白色 LED 刺激物。这种先进的透明显示器具有强大的稳定性、可制造性和成本效益，可应用于汽车、电子纸和增强现实设备等不同环境和行业。

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引用次数: 0

Simultaneous orthogonally polarized dual-wavelength actively Q-switched Ho:YLF laser at 2063 nm and 2065 nm 2063 纳米和 2065 纳米同时正交偏振双波长主动调 Q 开关 Ho:YLF 激光器

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2024-11-26 DOI: 10.1016/j.optlastec.2024.112210

Xiaofan Jing, Xinlu Zhang, Changchang Shen, Longyi Zhang, Jinjer Huang

The simultaneous and output-balanced orthogonally polarized dual-wavelength actively Q-switched Ho:YLF laser at 2063 nm and 2065 nm was realized for the first time. In the continuous wave orthogonally polarized dual-wavelength operation, the total maximum output power of 4.6 W was achieved. In the actively Q-switching orthogonally polarized dual-wavelength operation, at the pulse repetition frequency of 5 kHz, the total maximum average output power, pulse energy, and peak power were 2.37 W, 0.47mJ, and 4.32 kW, respectively. As far as we know, this is the first simultaneous orthogonally polarized dual-wavelength actively Q-switched 2 μm Ho-doped solid-state laser.

首次实现了 2063 nm 和 2065 nm 波长的同步输出平衡正交偏振双波长主动调 Q 开关 Ho:YLF 激光器。在连续波正交偏振双波长工作中，实现了 4.6 W 的总最大输出功率。在主动 Q 开关正交偏振双波长工作中，在脉冲重复频率为 5 kHz 时，总最大平均输出功率、脉冲能量和峰值功率分别为 2.37 W、0.47mJ 和 4.32 kW。据我们所知，这是第一台同时正交偏振双波长主动调 Q 开关 2 μm 掺 Ho 固体激光器。

引用次数: 0

Experiments and numerical simulations on fatigue properties of laser shock peening for FV520B steel FV520B 钢激光冲击强化疲劳特性的实验和数值模拟

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2024-11-26 DOI: 10.1016/j.optlastec.2024.112198

Dan Jin, Zhuang Liu, Zhuoqun Li, Chaoyue Guo, Mengying Sun

Laser shock peening (LSP) experiments, low cycle fatigue experiments, microhardness and residual stress measurements, and scanning electron microscopy (SEM) analyses were conducted on FV520B steel cylindrical specimens. Additionally, ABAQUS software was employed to predict fatigue life following the LSP process. The experimental results indicate that the surface compressive residual stresses induced by LSP inhibit both the initiation and propagation of fatigue cracks effectively, thereby prolonging the fatigue life of FV520B steel. The fatigue life of specimens at strain amplitudes of ± 0.5 %, ±0.6 %, ±0.7 %, and ± 1.0 % is improved by 132.2 %, 0.4 %, 18.0 %, and 88.8 %, respectively. A residual stress of −90 MPa is measured on the surface of the specimen and the surface hardness value increase by 48 % after LSP. The SEM results reveal that the characteristic of single crack sources for crack initiation is presented after LSP. The results of single point LSP simulation using ABAQUS demonstrate that the circumferential surface experiences a lower compressive residual stress of 30 MPa compared to a higher value of 45 MPa on the planar surface, this discrepancy arises due to rapidly decay associated with reduced rebound tensile strain on convex surfaces. A “multi-point continuous shock” simulation strategy was implemented for modeling LSP effects on the circumferential surface. The average compressive residual stress achieved was found to be 92 MPa, additionally, tensile residual stresses ranging from 8 MPa to 29 MPa were detected within secondary surfaces and inside the cylinder. Notably, discrepancies between simulated and experimental fatigue lives for LSP specimens across strain amplitudes of ± 0.5 %, ±0.6 %, ±0.7 %, and ± 1.0 % were minimal-ranging only between 10.4 % and 22.3 %.

对 FV520B 钢圆柱试样进行了激光冲击强化（LSP）实验、低循环疲劳实验、显微硬度和残余应力测量以及扫描电子显微镜（SEM）分析。此外，还使用 ABAQUS 软件预测了 LSP 工艺后的疲劳寿命。实验结果表明，LSP 产生的表面压缩残余应力能有效抑制疲劳裂纹的产生和扩展，从而延长 FV520B 钢的疲劳寿命。在应变振幅为 ± 0.5 %、±0.6 %、±0.7 % 和 ± 1.0 % 时，试样的疲劳寿命分别提高了 132.2 %、0.4 %、18.0 % 和 88.8 %。试样表面测得的残余应力为 -90 兆帕，LSP 后表面硬度值提高了 48%。扫描电子显微镜结果显示，LSP 后呈现出单个裂纹源引发裂纹的特征。使用 ABAQUS 进行的单点 LSP 模拟结果表明，圆周表面的压缩残余应力较低，为 30 兆帕，而平面表面的残余应力值较高，为 45 兆帕。为模拟 LSP 对圆周表面的影响，采用了 "多点连续冲击 "模拟策略。结果发现，获得的平均压缩残余应力为 92 兆帕，此外，在次表面和圆柱体内部检测到的拉伸残余应力从 8 兆帕到 29 兆帕不等。值得注意的是，LSP 试样在应变振幅为 ± 0.5%、±0.6%、±0.7% 和 ± 1.0% 时的模拟疲劳寿命与实验疲劳寿命之间的差异很小，仅在 10.4% 到 22.3% 之间。

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引用次数: 0

Full-duplex modulating retroreflector based UWOC system using MEMS grating modulator and SiPM 使用 MEMS 光栅调制器和 SiPM 的基于全双工调制反向反射器的 UWOC 系统

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2024-11-26 DOI: 10.1016/j.optlastec.2024.112163

Lihang Liu , Xinke Tang , Zhiyan Chen , Yibin Li , H.Y. Fu

In this paper, a single source full-duplex modulating retroreflector based underwater wireless optical communication (UWOC) system is proposed and experimentally demonstrated. A green laser is used and directly modulated for the downlink data transmission, and a reflective MEMS grating modulator is employed in the uplink to reflect and modulate the transmitting light. A large field-of-view (FOV) fisheye lens is mounted before the MEMS grating modulator to extend the field of view of the transceiver. The received signal in uplink, of which light beam travels through the underwater channel twice, is detected by a highly sensitive silicon photomultiplier (SiPM). The BER performance of the system is comprehensively investigated at different received optical powers and different incident angles. Experimental results show that the system can achieve 200-kbps uplink data rate and at 1.6-Gbps downlink data rate simultaneously at a wide field-of-view at 130°, offering a promising system design for practical applications such as data collection and controlling of small and lightweight underwater devices. To the best of our knowledge, it is the first time that Modulating retroreflector (MRR) based full-duplex UWOC system with only one light source has been experimentally demonstrated and studied. The achievable transmission distances of the proposed system at different water types are estimated, which are about 49 m and 15 m, in pure sea water and clear ocean water respectively.

本文提出了一种基于单源全双工调制反向反射器的水下无线光通信（UWOC）系统，并进行了实验演示。下行链路数据传输采用直接调制的绿色激光，上行链路采用反射式 MEMS 光栅调制器对发射光进行反射和调制。在 MEMS 光栅调制器之前安装了一个大视场（FOV）鱼眼镜头，以扩大收发器的视场。上行链路中的接收信号由高灵敏度的硅光电倍增管（SiPM）检测，光束在水下信道中传输两次。在不同接收光功率和不同入射角度下，对系统的误码率性能进行了全面研究。实验结果表明，该系统可在 130° 的宽视场角下同时实现 200-kbps 的上行数据传输速率和 1.6-Gbps 的下行数据传输速率，为数据采集和控制小型轻量级水下设备等实际应用提供了一种前景广阔的系统设计。据我们所知，基于调制反向反射器（MRR）的全双工 UWOC 系统只有一个光源，这是首次进行实验演示和研究。据估计，该系统在不同水域类型下的可实现传输距离分别约为 49 米和 15 米（在纯净海水和清澈海水中）。

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引用次数: 0