Optica Applicata最新文献_第4页

Far and near fields of Hermite–Gaussian beams passing through an annular aperture and its numerical simulation by the angular spectrum method 厄米高斯光束通过环形孔径的远场和近场及其角谱法数值模拟

4区物理与天体物理

Optica Applicata Pub Date : 2023-01-01 DOI: 10.37190/oa230310

Alexander Talatinian

引用次数: 0

Average capacity analysis of FSO system with Airy beam as carrier over exponentiated Weibull channels 指数威布尔信道上以Airy波束为载波的FSO系统的平均容量分析

IF 0.6 4区物理与天体物理

Optica Applicata Pub Date : 2023-01-01 DOI: 10.37190/oa230103

Yi Li, Xingchun Chu, Zhongxiang Han, Hanling Tang, Xinkang Song

{"title":"Average capacity analysis of FSO system with Airy beam as carrier over exponentiated Weibull channels","authors":"Yi Li, Xingchun Chu, Zhongxiang Han, Hanling Tang, Xinkang Song","doi":"10.37190/oa230103","DOIUrl":"https://doi.org/10.37190/oa230103","url":null,"abstract":"Based on scintillation index of Airy beam and exponentiated Weibull channel model, analytical expressions of average channel capacity for free-space optical (FSO) communication links with Airy beam as signal carrier under weak atmospheric turbulence and on-off keying modulation scheme are derived. The average capacity at various propagation distances, transverse scale factors and exponential decay factors has been evaluated. And we compared the average capacity of FSO links with Airy beam and Gaussian beam as signal carrier. The results show that the average capacity of FSO links with Airy beam as carrier increases with the increase of mean signal-to-noise ratio and decreases uniformly with the increase of propagation distance. When the transverse scale factor of Airy beam is about 2 cm, a higher average capacity can be obtained. And the smaller the exponential decay factor of Airy beam, the larger the average capacity. Under the same source power or source width, the average capacity of FSO links with Airy beam as carrier is significantly higher than that of FSO links with Gaussian beam as carrier. The results of this research have some reference significance for the application of Airy beam in FSO communication system.","PeriodicalId":19589,"journal":{"name":"Optica Applicata","volume":"1 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70017799","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

Monte Carlo simulation of polarization of light back-scattered from randomly rough surfaces 随机粗糙表面背向散射光偏振的蒙特卡罗模拟

IF 0.6 4区物理与天体物理

Optica Applicata Pub Date : 2023-01-01 DOI: 10.37190/oa230105

Yuxiang Jiang, Zhenhua Li

{"title":"Monte Carlo simulation of polarization of light back-scattered from randomly rough surfaces","authors":"Yuxiang Jiang, Zhenhua Li","doi":"10.37190/oa230105","DOIUrl":"https://doi.org/10.37190/oa230105","url":null,"abstract":"Laser detection devices obtain target information from back-scattered light, such as lidar. The recognition rate can be improved by analyzing intensity and polarization of echo signal. In this paper, Monte Carlo method is used to generate a large number of randomly rough surfaces to simulate targets. Every rough surface is discretized into a large number of micro-surface elements. Stokes parameters of back-scattered light are calculated by numerical integration. Incident light is p-, s-, 45° linearly polarized light and right-hand circularly polarized light, respectively. Numerical results show that when s- and p-linearly polarized light incident on a metal rough surface, back-scattered light appears circularly polarized component. Metal rough surface resembles a wave plate with phase difference, with the fast axis parallel or perpendicular to the 45° direction. When linearly polarized light is incident on dielectric rough surface, back-scattered light has no circularly polarized component. Experimental data are consistent with the numerical results. The above research provides a new basis for laser detection device to identify metal targets from the environmental background.","PeriodicalId":19589,"journal":{"name":"Optica Applicata","volume":"1 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70018716","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

SPAD timing jitter modeling using Fourier series SPAD时序抖动的傅立叶级数建模

IF 0.6 4区物理与天体物理

Optica Applicata Pub Date : 2023-01-01 DOI: 10.37190/oa230206

K. Eyvazi, M. A. Karami

引用次数: 0

Strain measurement based on fixed wavelength transmission of tapered long-period fiber grating 基于固定波长传输的锥形长周期光纤光栅应变测量

IF 0.6 4区物理与天体物理

Optica Applicata Pub Date : 2022-01-01 DOI: 10.37190/oa220403

Yong Tang, Hao Zhang, Li Zhang, Xin Feng Yu, Yun Feng Bai

{"title":"Strain measurement based on fixed wavelength transmission of tapered long-period fiber grating","authors":"Yong Tang, Hao Zhang, Li Zhang, Xin Feng Yu, Yun Feng Bai","doi":"10.37190/oa220403","DOIUrl":"https://doi.org/10.37190/oa220403","url":null,"abstract":"This paper studies the relationship between transmission intensity and strain based on tapered long-period fiber grating at a fixed wavelength. In experiments, tapered long-period fiber grating was prepared by the electric melting method. Experimental results show that two resonance peaks appeared at 1482 and 1537 nm, respectively. Here is the elaboration of the relationship between the resonant wavelength and the strain, its wavelength-strain sensitivity is 20 pm/με, and the linearity was negative. Then our next study was about the relationship between transmission intensity and strain at a fixed wavelength. The results show that the transmission intensity at a fixed wavelength is related to the exponent with strain. The coupled-mode theory is applied to simulate the relationship between fixed wavelength and strain. The simulation results matched the experimental results. Two fixed wavelength transmission intensity ratio was used, and the ratio showed a linear relationship with the strain, and the slope is –0.018 dB/με. Therefore, within the 0.01% resolution of our detector, we could resolve a 0.16 με strain change. We can select the appropriate light source and detector to achieve higher measurement accuracy. Thus, there is a great potential in fiber grating strain sensors.","PeriodicalId":19589,"journal":{"name":"Optica Applicata","volume":"1 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70016911","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: 1

The far-zone behaviors of light waves on scattering from particulate medium with various distribution 不同分布的颗粒介质散射时光波的远区特性

IF 0.6 4区物理与天体物理

Optica Applicata Pub Date : 2022-01-01 DOI: 10.37190/oa220209

Qihang Dai, Zhongyuan Xie, Xiaoning Pan, Xiaoling Ji, Tao Wang

引用次数: 0

Spatial light modulator design and generation of structured electromagnetic waves using digital light processors 利用数字光处理器的空间光调制器设计和结构电磁波的产生

IF 0.6 4区物理与天体物理

Optica Applicata Pub Date : 2022-01-01 DOI: 10.37190/oa220311

F. Yalcinkaya, T. Koc, Z. Pala

{"title":"Spatial light modulator design and generation of structured electromagnetic waves using digital light processors","authors":"F. Yalcinkaya, T. Koc, Z. Pala","doi":"10.37190/oa220311","DOIUrl":"https://doi.org/10.37190/oa220311","url":null,"abstract":"Spatial light modulators (SLMs) are versatile devices used for optical studies. These instruments have a wide area of application in photonics. Additionally, SLMs have potential utility in different applications, such as biomedical applications, laser based surgery for precise cutting and as optical tweezers to separate cells in a petri container. However, the high cost of SLM devices prevents their widespread use in many areas, including industrial areas and scientific research laboratories. This paper demonstrates how to design a digital light processor (DLP) based low-cost SLM and describes how to obtain structured electromagnetic waves with the designed SLM. Therefore, this research was undertaken to design and produce a low-cost SLM device for optical applications. For this purpose, two prerequisites had to be fulfilled, the first was to use suitable components of a projection device with DLP-based digital micro-mirror device (DMD), and the second was to eliminate unnecessary SLM components from the system. Finally, holographic images reflected on the SLM screen were created by using Mathematica software program to change the amplitude and phase of the electromagnetic waves in order to obtain the structured electromagnetic waves.","PeriodicalId":19589,"journal":{"name":"Optica Applicata","volume":"1 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70016284","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: 1

Control of optical chaos spectrum in semiconductor laser for secure RoF communication 半导体激光器混沌谱的安全RoF通信控制

IF 0.6 4区物理与天体物理

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

Danish Ali Mazhar, Syed Zafar Ali, Muhammad Khawar Islam

{"title":"Control of optical chaos spectrum in semiconductor laser for secure RoF communication","authors":"Danish Ali Mazhar, Syed Zafar Ali, Muhammad Khawar Islam","doi":"10.37190/oa220401","DOIUrl":"https://doi.org/10.37190/oa220401","url":null,"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.","PeriodicalId":19589,"journal":{"name":"Optica Applicata","volume":"1 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70016402","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

Properties of an electromagnetic twisted Gaussian Schell-model array beam propagating in anisotropic atmosphere turbulence 电磁扭曲高斯-谢尔模型光束在各向异性大气湍流中的传播特性

IF 0.6 4区物理与天体物理

Optica Applicata Pub Date : 2022-01-01 DOI: 10.37190/oa220413

Xianyang Yang, Wenyu Fu, Xuehua Hu, Xue Li

引用次数: 0

Active control of terahertz wave assisted by dielectric loaded plasmonic waveguide 介质负载等离子体波导辅助太赫兹波的主动控制

IF 0.6 4区物理与天体物理

Optica Applicata Pub Date : 2022-01-01 DOI: 10.37190/oa220107

Huaiqing Liu, Mengya Yang, Xue He, Youchao Jiang, Xiancun Zhou, Maosheng Fu

引用次数: 0