Photonics最新文献_第5页

Performance of Adaptive Bit-Interleaved Polar Coded Modulation in FSOC System FSOC 系统中的自适应比特交织极性编码调制性能

IF 2.4 4区物理与天体物理

Photonics Pub Date : 2023-12-29 DOI: 10.3390/photonics11010034

Qingfang Jiang, Zhi Liu, Haifeng Yao, Zhonglin Luo, Xin Zhang, Shutong Liu, Chenming Cao, Gang Jing, Hao Li, Peng Lin

{"title":"Performance of Adaptive Bit-Interleaved Polar Coded Modulation in FSOC System","authors":"Qingfang Jiang, Zhi Liu, Haifeng Yao, Zhonglin Luo, Xin Zhang, Shutong Liu, Chenming Cao, Gang Jing, Hao Li, Peng Lin","doi":"10.3390/photonics11010034","DOIUrl":"https://doi.org/10.3390/photonics11010034","url":null,"abstract":"This paper proposes an adaptive bit-interleaved polar coded modulation (A-BIPCM) method based on minimum logarithmic upper bound weight (MLUW). It is designed to reduce the fading effects and long string of bit error interference caused by atmospheric turbulence in free-space optical communications (FSOC). To assess the effectiveness of this method across turbulent channels of varying intensities, we conducted an evaluation of the bit error rate (BER) performance of polar codes in turbulent channels. The results demonstrate significant performance improvements provided by the A-BIPCM method compared to conventional polar code encoding and decoding. Specifically, under weak, moderate, and strong turbulence conditions, the A-BIPCM method achieves performance gains of 0.96 dB, 1.66 dB, and 1.35 dB, respectively. Additionally, an experimental verification platform for FSOC employing intensity modulation direct detection (IM/DD) with an atmospheric turbulence simulation channel, is established in this work. When the optical power of the detector is −16 dBm, the traditional polar code encoding and decoding performance at BER = 2.36 × 10−5, whereas the A-BIPCM scheme exhibits a significantly higher performance at BER = 2.11 × 10−6. The BER has been improved by representing an order of magnitude.","PeriodicalId":20154,"journal":{"name":"Photonics","volume":"49 s243","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139146718","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Attitude Determination of Photovoltaic Device by Means of Differential Absorption Imaging 利用差分吸收成像确定光伏设备的姿态

IF 2.4 4区物理与天体物理

Photonics Pub Date : 2023-12-29 DOI: 10.3390/photonics11010032

K. Asaba, Tomoyuki Miyamoto

{"title":"Attitude Determination of Photovoltaic Device by Means of Differential Absorption Imaging","authors":"K. Asaba, Tomoyuki Miyamoto","doi":"10.3390/photonics11010032","DOIUrl":"https://doi.org/10.3390/photonics11010032","url":null,"abstract":"Future wireless power transmission will cover power levels up to kilowatts or more and transmission distances up to the scale of kilometers. With its narrow beam divergence angle, optical wireless power transmission (OWPT) is a promising candidate for such system implementations. In the operation of OWPT, it is necessary to estimate the position, direction (azimuth, elevation), and attitude of the target photovoltaic device before the power supply. The authors have proposed the detection of targets using differential absorption imaging and positioning with a combination of stereo imagery. In the positioning by stereo imagery, a condition regarding the consistency of the left and right images can be defined. This corresponds to the certain value of the exposure time of the image sensor, and this depends on the target’s attitude angle. In this paper, we discuss target attitude estimation using this minimum exposure time at which the integrity measure converges. A physical model was derived under general conditions of target position and experimental configuration. Target attitudes were estimated within an error range of 10 to 15 degrees in approximately 60 degrees range. On the other hand, there is an attitude estimation method based on the apparent size of the target. When using this method to estimate the attitude angle, errors are significantly large for specular and diffuse mixed targets like the PV. The method proposed in this paper is a robust attitude estimation method for the photovoltaic device in OWPT.","PeriodicalId":20154,"journal":{"name":"Photonics","volume":" 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139142916","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Standard Single-Mode Fiber with High Modal Bandwidth as Two-Mode Fiber around 1060 nm for High Data Rate Transmission 具有高模态带宽的标准单模光纤与 1060 nm 波长附近的双模光纤一样适用于高数据速率传输

IF 2.4 4区物理与天体物理

Photonics Pub Date : 2023-12-29 DOI: 10.3390/photonics11010035

Xin Chen, J. E. Hurley, Snigdharaj K. Mishra, J. Stone, Ming-Jun Li

引用次数: 0

Multi-Mode Vector Light Field Generation Using Modified Off-Axis Interferometric Holography and Liquid Crystal Spatial Light Modulators 利用改良离轴干涉全息技术和液晶空间光调制器生成多模式矢量光场

IF 2.4 4区物理与天体物理

Photonics Pub Date : 2023-12-29 DOI: 10.3390/photonics11010033

Wenxu Zhu, Feilong Gao, Qianqian Fu, Xinlong Zhou, Y. Xie, Bingyuan Zhang, Santosh Kumar

{"title":"Multi-Mode Vector Light Field Generation Using Modified Off-Axis Interferometric Holography and Liquid Crystal Spatial Light Modulators","authors":"Wenxu Zhu, Feilong Gao, Qianqian Fu, Xinlong Zhou, Y. Xie, Bingyuan Zhang, Santosh Kumar","doi":"10.3390/photonics11010033","DOIUrl":"https://doi.org/10.3390/photonics11010033","url":null,"abstract":"The increasing enhancement in the modulation accuracy of spatial light modulators has garnered significant attention towards real-time control technology for light fields based on these modulators. It has been demonstrated that this technology possesses a remarkable capability to generate vector beams with arbitrary complex amplitude distributions. Nevertheless, past studies indicate that the generation of only one vector beam at a time has been observed. The simultaneous generation of numerous vector light fields can give rise to several challenges, including compromised picture quality, limited single-mode operation, and intricate optical path configurations. In pursuit of this objective, we present a novel methodology that integrates the coding methodology of modified off-axis interferometric holography with the idea of optical superposition. This technique facilitates the concurrent generation of several vector beams. In this study, we present a demonstration of the simultaneous creation of twelve vector beams using a single spatial light modulator (SLM) as a proof of concept. Significantly, this technology has the ability to generate an unlimited quantity of vector light fields concurrently under the assumption that the resolution of the SLM does not impose any limitations. The findings indicate that the imaging quality achieved by this technology is of a high standard. Furthermore, it is possible to separately control the beam waist radius, topological charge, polarization order, and extra phase of each beam.","PeriodicalId":20154,"journal":{"name":"Photonics","volume":" 26","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139142450","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fine Structure of High-Energy Pulses from a Stimulated Brillouin Scattering-Assisted Q-Switch Tm-Doped Fiber Laser 受激布里渊散射辅助 Q 开关掺氩光纤激光器高能脉冲的精细结构

IF 2.4 4区物理与天体物理

Photonics Pub Date : 2023-12-29 DOI: 10.3390/photonics11010030

Vladimir Kamynin, S. Filatova, Timur I. Mullanurov, M. D. Cheban, Alexey A. Wolf, D. Korobko, A. Fotiadi, Vladimir B. Tsvetkov

引用次数: 0

Methods of Radiation Wavelength Tuning in Short-Pulsed Fibre Lasers 短脉冲光纤激光器的辐射波长调谐方法

IF 2.4 4区物理与天体物理

Photonics Pub Date : 2023-12-28 DOI: 10.3390/photonics11010028

S. Kobtsev

引用次数: 0

An Efficient Method for Wavefront Aberration Correction Based on the RUN Optimizer 基于 RUN 优化器的高效波前像差校正方法

IF 2.4 4区物理与天体物理

Photonics Pub Date : 2023-12-28 DOI: 10.3390/photonics11010029

Huizhen Yang, Xiangdong Zang, Peng Chen, Xingliu Hu, Yongqiang Miao, Zhaojun Yan, Zhiguang Zhang

{"title":"An Efficient Method for Wavefront Aberration Correction Based on the RUN Optimizer","authors":"Huizhen Yang, Xiangdong Zang, Peng Chen, Xingliu Hu, Yongqiang Miao, Zhaojun Yan, Zhiguang Zhang","doi":"10.3390/photonics11010029","DOIUrl":"https://doi.org/10.3390/photonics11010029","url":null,"abstract":"The correction of wavefront aberrations in wavefront sensorless (WFS-less) adaptive optical (AO) systems requires control algorithms that can ensure rapid convergence while maintaining effective correction capabilities. This paper proposes a novel control algorithm based on the RUNge Kutta optimizer (RUN) for WFS-less AO systems that enables the quick and efficient correction of small aberrations, as well as larger aberrations. To evaluate the convergence speed and correction capabilities of a WFS-less AO system based on the RUN control algorithm, we constructed a simulated AO system and an experimental setup with a 97-element deformable mirror (DM), respectively. Additionally, the results obtained with the Particle Swarm Optimization (PSO) algorithm, Differential Evolution Algorithm (DEA), and Genetic Algorithm (GA) are also provided for comparison and analysis. Both the simulated and experimental results consistently demonstrated that our proposed method outperformed several competing algorithms in terms of correction performance and convergence speed. Furthermore, the experimental results further validate the effectiveness of our control algorithm in scenarios involving significant aberrations.","PeriodicalId":20154,"journal":{"name":"Photonics","volume":"33 6","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139152059","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dynamic Micro-Vibration Measurement Based on Orbital Angular Momentum 基于轨道角动量的动态微振动测量

IF 2.4 4区物理与天体物理

Photonics Pub Date : 2023-12-28 DOI: 10.3390/photonics11010027

Jialong Zhu, Fucheng Zou, Le Wang, Shengmei Zhao

引用次数: 0

Design of a Scanning Module in a Confocal Microscopic Imaging System for Live-Cell Imaging 设计用于活细胞成像的共聚焦显微成像系统中的扫描模块

IF 2.4 4区物理与天体物理

Photonics Pub Date : 2023-12-28 DOI: 10.3390/photonics11010026

Ran Tao, Tao Zhang

{"title":"Design of a Scanning Module in a Confocal Microscopic Imaging System for Live-Cell Imaging","authors":"Ran Tao, Tao Zhang","doi":"10.3390/photonics11010026","DOIUrl":"https://doi.org/10.3390/photonics11010026","url":null,"abstract":"This study proposes a Nipkow-based pinhole disk laser scanning confocal microscopic imaging system for ordinary optical microscopy, fluorescence microscopy, and confocal microscopy imaging of biological samples in order to realize the dynamic experimental monitoring of space-based life science experiments and the fine observation of biological samples. Confocal microscopic imaging is mainly completed by a scanning module that is composed of a spinning disk and other components. The parameters of the spinning disk directly determine the quality of the image. During the design process, the resolution and signal-to-noise ratios caused by different pinhole diameters in the spinning disk are the main considerations. Changes and image blurring caused by crosstalk due to the pinhole arrangement and different pinhole spacings are addressed. The high photon efficiency of the new EMCCD (electron-multiplying charge-coupled device) and CMOS (complementary metal-oxide-semiconductor) camera reduces the exposure time as much as possible, reduces damage to living cells, and achieves high-speed confocal imaging. It is shown in a confocal imaging experiment with a variable magnification of 1–40× that the imaging resolution of the system can reach a maximum of 2592 × 1944, the spatial resolution can reach 1 μm, and the highest sampling frequency is 10 fps, thus meeting the design requirements for high-speed live-cell imaging.","PeriodicalId":20154,"journal":{"name":"Photonics","volume":"3 7","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139151659","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Simulation and Experimental Study of Nanosecond Pulse Laser Removal of Epoxy Paint on 6061 Aluminum Alloy Surface 纳秒脉冲激光去除 6061 铝合金表面环氧树脂涂料的模拟与实验研究

IF 2.4 4区物理与天体物理

Photonics Pub Date : 2023-12-27 DOI: 10.3390/photonics11010025

Yahui Li, Jing-yi Li, Hang Dong, Wei Zhang, Guangyong Jin

{"title":"Simulation and Experimental Study of Nanosecond Pulse Laser Removal of Epoxy Paint on 6061 Aluminum Alloy Surface","authors":"Yahui Li, Jing-yi Li, Hang Dong, Wei Zhang, Guangyong Jin","doi":"10.3390/photonics11010025","DOIUrl":"https://doi.org/10.3390/photonics11010025","url":null,"abstract":"Laser paint removal is a new cleaning technology that mainly removes paint through thermal ablation and mechanical stripping mechanisms. This paper established a thermal-mechanical coupling laser removal model of paint based on the heat conduction equation, Newton’s second law, and Fabbro’s theory. The removal process of epoxy resin paint film on an aluminum alloy surface via a nanosecond pulsed laser was studied using finite element simulations and experimental measurements. The simulation and experimental results show that the nanosecond pulse laser’s primary paint removal mechanism is the mechanical stripping caused by thermal stress and plasma shock. The laser paint removal threshold is 1.4 J/cm2. In addition, due to the different generation times of plasma shock and thermal stress, the mutual superposition of stress waves occurs in the material. This results in a discrepancy between the actual and thermal stress differences. Moreover, the thermal stress difference causes the maximum actual stress difference to fluctuate. The simulation model established in this paper can provide a reference for studying the thermal-mechanical coupling process of laser paint removal.","PeriodicalId":20154,"journal":{"name":"Photonics","volume":"91 4","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139154365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0