Photonics最新文献_第2页

The Propagation Characteristics of Circular Airy Beams with Propagational Fractional-Order Optical Vortices 带有传播分序光涡的圆形空气光束的传播特性

IF 2.4 4区物理与天体物理

Photonics Pub Date : 2024-01-07 DOI: 10.3390/photonics11010064

Guoliang Zheng, Lili Wan, Tiefeng He, Qingyang Wu, Xuhui Zhang

{"title":"The Propagation Characteristics of Circular Airy Beams with Propagational Fractional-Order Optical Vortices","authors":"Guoliang Zheng, Lili Wan, Tiefeng He, Qingyang Wu, Xuhui Zhang","doi":"10.3390/photonics11010064","DOIUrl":"https://doi.org/10.3390/photonics11010064","url":null,"abstract":"We investigate the propagation properties of circular Airy beams (CABs) with propagational fractional-order optical vortices (OVs). The superposition of the phase singularity and polarization singularity from a vortex vector beam (VVB) plays a significant role in creating a propagational fractional vortex beam. Propagational fractional vortex beams can be considered as a superposition of left and right circularly polarized vortex beams with different integer topological charges (TCs). We study the propagation characteristics of two kinds of propagational fractional vortex CABs, and the results show that both of the two kinds of beams can stably propagate in free space, and they exhibit an “abruptly auto-focusing” property and “self-healing” property during the propagation. The intensity distribution of the first kind of propagational fractional vortex CAB has an odd number of petals (2m + 1), while the second kind of beam has a crescent-shaped intensity distribution. The influence of turbulence on the beam propagation through atmosphere under different turbulence strengths is also numerically studied in this paper. A fractional vortex CAB with an initial radius r0 = 10 mm can retain its shape after propagating 20 m when the atmospheric refractive-index structure constant CN2=0.2×10−12m−2/3. Our results are expected to broaden the application of CABs.","PeriodicalId":20154,"journal":{"name":"Photonics","volume":"68 38","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139449024","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

Reconfigurable Microwave Multi-Beamforming Based on Optical Switching and Distributing Network 基于光交换和分配网络的可重构微波多波束成形

IF 2.4 4区物理与天体物理

Photonics Pub Date : 2024-01-07 DOI: 10.3390/photonics11010065

Yue Lin, Di Jiang, Yuan Chen, Xiang Li, Qi Qiu

{"title":"Reconfigurable Microwave Multi-Beamforming Based on Optical Switching and Distributing Network","authors":"Yue Lin, Di Jiang, Yuan Chen, Xiang Li, Qi Qiu","doi":"10.3390/photonics11010065","DOIUrl":"https://doi.org/10.3390/photonics11010065","url":null,"abstract":"Optical beamforming in microwave photonics is promising for supporting broadband wireless communications. However, the current optical beamforming lacks freedom because of the fixed connection between radio frequency (RF) signal and antenna elements (AEs). This manuscript tackles this challenge by proposing a dynamical optical beamforming architecture that reconfigures the antenna subarray for signal transmission depending on the number of signals to be transmitted. The proposed architecture employs an optical switching and distributing network (SDN) to realize a flexible connection between signals and AEs. An instance of the proposed architecture in photonic integrated circuits, which enables three working modes and transmits four RF signals through sixteen AEs, was presented and numerically simulated. The optical field distribution and beam pattern plots illustrated the operational principle and validated the feasibility of the proposed SDN architecture. Furthermore, the impact of the introduced architecture on the signal amplitude–phase consistency and the comparison of the proposed dynamic architecture and conventional fixe architectures are analyzed and discussed. The results indicate that the proposed architecture exhibits variable beamforming gain with lower hardware complexity.","PeriodicalId":20154,"journal":{"name":"Photonics","volume":"64 33","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139449199","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

Efficient Cherenkov-Type Optical-to-Terahertz Conversion of Femtosecond Oscillator Pulses 飞秒振荡器脉冲的高效切伦科夫型太赫兹光电转换

IF 2.4 4区物理与天体物理

Photonics Pub Date : 2024-01-06 DOI: 10.3390/photonics11010062

M. Kurnikov, N. Abramovsky, A. I. Shugurov, S. Bodrov, M. Bakunov

引用次数: 0

Monolayer Chiral Metasurface for Generation of Arbitrary Cylindrical Vector Beams 用于产生任意圆柱矢量光束的单层手性元表面

IF 2.4 4区物理与天体物理

Photonics Pub Date : 2024-01-05 DOI: 10.3390/photonics11010057

Qian Chen, Peijun Liu, Yanan Fu, Shuoshuo Zhang, Yuquan Zhang, Xiaocong Yuan, C. Min

引用次数: 0

Sub-Nanosecond, High Peak Power Yb:YAG/Cr4+:YAG/YVO4 Passively Q-Switched Raman Microchip Laser with the Emission of Multiple Pulses 可发射多脉冲的亚纳秒、高峰值功率 Yb:YAG/Cr4+:YAG/YVO4 无源 Q 开关拉曼微芯片激光器

IF 2.4 4区物理与天体物理

Photonics Pub Date : 2024-01-05 DOI: 10.3390/photonics11010061

Xiaolei Wang, Chaoyi Zhang, Yanlu Zhang, Shengying Fan, Xinqiang Ma, W. Cheng

引用次数: 0

Cooperative Terrestrial–Underwater FSO System: Design and Performance Analysis 地面-水下合作 FSO 系统：设计与性能分析

IF 2.4 4区物理与天体物理

Photonics Pub Date : 2024-01-05 DOI: 10.3390/photonics11010058

C. Álvarez-Roa, M. Álvarez-Roa, Thiago R. Raddo, A. Jurado-Navas, M. Castillo-Vázquez

{"title":"Cooperative Terrestrial–Underwater FSO System: Design and Performance Analysis","authors":"C. Álvarez-Roa, M. Álvarez-Roa, Thiago R. Raddo, A. Jurado-Navas, M. Castillo-Vázquez","doi":"10.3390/photonics11010058","DOIUrl":"https://doi.org/10.3390/photonics11010058","url":null,"abstract":"In this paper, we propose, design, and evaluate a new hybrid terrestrial–underwater optical communication link for providing high-speed connectivity between land and underwater systems. A device based on an amplify-and-forward strategy is considered and used for the hybrid optical link. A performance analysis of the proposed hybrid system is then carried out, taking into account both the atmospheric and underwater channels and their respective degradation sources. Different networking scenarios and conditions are evaluated. To this end, the channel model of the terrestrial free-space optical (FSO) link is modeled using the Gamma–Gamma distribution, while the underwater optical link is modeled using the Weibull distribution. The former takes into account atmospheric and turbulence attenuation, geometric spread and pointing errors, while the latter takes into account underwater and turbulence attenuation and geometric spread. Accordingly, a new analytical closed-form expression for the bit error rate (BER), which depends on the cumulative distribution function of the holistic hybrid system, is derived. Analytical results show that pointing errors as well as atmospheric and oceanic turbulence seriously degrade the performance of the hybrid system. In addition, ocean turbulence leads to the occurrence of a BER floor in some scenarios. This is the first time that such a network is proposed and modeled under the assumption of critical channel impairments.","PeriodicalId":20154,"journal":{"name":"Photonics","volume":"51 13","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139384158","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

The Design and Characterization of an Ultra-Compact Asymmetrical Multimode Interference Splitter on Lithium Niobate Thin Film 铌酸锂薄膜超小型非对称多模干涉分光器的设计与特性分析

IF 2.4 4区物理与天体物理

Photonics Pub Date : 2024-01-05 DOI: 10.3390/photonics11010060

Dechen Li, Jinye Li, Run Li, Jianguo Liu

引用次数: 0

Online Denoising Single-Pixel Imaging Using Filtered Patterns 利用滤波模式对单像素成像进行在线去噪

IF 2.4 4区物理与天体物理

Photonics Pub Date : 2024-01-05 DOI: 10.3390/photonics11010059

Zhaohua Yang, Xiang Chen, Zhihao Zhao, Lingan Wu, Yuanjin Yu

引用次数: 0

The Determination of the Sensitivity of Refractive Index Sensors 折射率传感器灵敏度的测定

IF 2.4 4区物理与天体物理

Photonics Pub Date : 2024-01-04 DOI: 10.3390/photonics11010056

I. M. Efimov, N. A. Vanyushkin, A H Gevorgyan

引用次数: 0

Generation and Dynamics of Multiple Pulses in an Ultrafast Fiber Laser with a Single-Mode Fiber–Graded-Index Multimode Fiber–Single-Mode Fiber-Based Saturable Absorber 使用单模光纤-分级指数多模光纤-单模光纤可饱和吸收器的超快光纤激光器中多脉冲的产生和动力学特性

IF 2.4 4区物理与天体物理

Photonics Pub Date : 2024-01-04 DOI: 10.3390/photonics11010052

Yatao Yang, Qiong Zeng, Yanzhao Yang, Geguo Du, Jianhua Ji, Yufeng Song, Zhenhong Wang, Ke Wang

{"title":"Generation and Dynamics of Multiple Pulses in an Ultrafast Fiber Laser with a Single-Mode Fiber–Graded-Index Multimode Fiber–Single-Mode Fiber-Based Saturable Absorber","authors":"Yatao Yang, Qiong Zeng, Yanzhao Yang, Geguo Du, Jianhua Ji, Yufeng Song, Zhenhong Wang, Ke Wang","doi":"10.3390/photonics11010052","DOIUrl":"https://doi.org/10.3390/photonics11010052","url":null,"abstract":"In this study, we have investigated the evolution process and dynamic characteristics of a multi-pulse regime in an erbium-doped fiber ring laser based on a single-mode fiber–graded-index multimode fiber–single-mode fiber (SMF-GIMF-SMF) structure as an optical modulator. By utilizing the excellent nonlinear optical absorption of the SMF-GIMF-SMF (SMS) device with a modulation depth of ~8.68%, stable single-pulse mode locking at the frequency of 9.84 MHz can be readily observed at low pump power. In addition, the single-pulse operation can evolve into a multiple-pulse regime on account of the peak-power-clamping effect via suitably raising the pump power and carefully regulating the polarization state. Further, the single-shot temporal evolution of multiple pulses is monitored, indicating that this state shows unique and interesting temporal characteristics with variable pulse separations and inconsistent pulse intensities, which, as far as we know, is the first such observation in ultrafast fiber lasers. Additionally, this study, based on the time-stretch dispersive Fourier transformation method, suggests that these multiple pulses consist of chaotic wave envelopes with erratic intensities and changeable pulse energy. We believe that these findings have profound implications for revealing fascinating nonlinear pulse dynamics in ultrafast fiber optics.","PeriodicalId":20154,"journal":{"name":"Photonics","volume":"11 2","pages":""},"PeriodicalIF":2.4,"publicationDate":"2024-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139385273","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