Photonics最新文献_第8页

Investigation of OFDM-Based HS-PON Using Front-End LiFiSystem for 5G Networks 利用前端 LiFiSystem 研究 5G 网络中基于 OFDM 的 HS-PON

IF 2.4 4区物理与天体物理

Photonics Pub Date : 2023-12-16 DOI: 10.3390/photonics10121384

Meet Kumari, Mai Banawan, Vivek Arya, Satyendra Kumar Mishra

{"title":"Investigation of OFDM-Based HS-PON Using Front-End LiFiSystem for 5G Networks","authors":"Meet Kumari, Mai Banawan, Vivek Arya, Satyendra Kumar Mishra","doi":"10.3390/photonics10121384","DOIUrl":"https://doi.org/10.3390/photonics10121384","url":null,"abstract":"Fifth-generation (5G) technology has enabled faster communication speeds, lower latency, a broader range of coverage, and greater capacity. This research aims to introduce a bidirectional high-speed passive optical network (HS-PON) for 5G applications and services including mobile computing, cloud computing, and fiber wireless convergence. Using 16-ary quadrature amplitude modulation orthogonal frequency division multiplexing techniques, the system transmits uplinks and downlinks with a pair of four wavelengths each. Light fidelity (LiFi) services are provided with blue light-emitting-diode-based technology. With a threshold bit error rate (BER) of 10−3, the results demonstrate reliable transportation over a 100 km fiber at −17 dBm received power and in a maximum LiFi range of 20 m. Furthermore, the system offers symmetric 4 × 50 Gbps transmission rates under the impact of fiber–LiFi channel impairments with maximum irradiance and incidence half-angles of 500. Additionally, at threshold BER, the system provides a detection surface range from 1.5 to 4 cm2. Compared to existing networks, the system also provides a high gain and low noise figure. A number of features make this system an attractive option. These include its high speed, high reach, high split ratio, low cost, easy upgradeability, pay-as-you-grow properties, high reliability, and ability to accommodate a large number of users.","PeriodicalId":20154,"journal":{"name":"Photonics","volume":"42 4","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138967760","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

Generation of Perfect Vortex Beams with Complete Control over the Ring Radius and Ring Width 生成完美涡束，完全控制环半径和环宽度

IF 2.4 4区物理与天体物理

Photonics Pub Date : 2023-12-15 DOI: 10.3390/photonics10121382

Xin Tao, Yong Liang, Shirui Zhang, Yueqing Li, Minghao Guo, Peng Li

{"title":"Generation of Perfect Vortex Beams with Complete Control over the Ring Radius and Ring Width","authors":"Xin Tao, Yong Liang, Shirui Zhang, Yueqing Li, Minghao Guo, Peng Li","doi":"10.3390/photonics10121382","DOIUrl":"https://doi.org/10.3390/photonics10121382","url":null,"abstract":"We have experimentally created perfect vortex beams (PVBs) by Fourier transformation of Bessel–Gaussian vortex beams, which are generated by modulating the fundamental Gaussian beam with the spiral phase plates and the axicons, respectively. Although the method has been used many times by other authors, as far as we know, few people pay attention to the quantitative relationship between the control parameters of the PVB and ring width. The effects of the waist radius of the fundamental Gaussian beam wg, base angle of the axicon γ, and focal length of the lens f on the spot parameters (ring radius ρ, and ring half-width Δ) of PVB are systematically studied. The beam pattern of the generated Bessel–Gaussian beam for different propagation distances behind the axicon and the fundamental Gaussian beam wg is presented. We showed experimentally that the ring radius ρ increases linearly with the increase of the base angle γ and focal length f, while the ring half-width Δ decreases with the increase of the fundamental beam waist radius wg, and increases with enlarging the focal length f. We confirmed the topological charge (TC) of the PVB by the interferogram between the PVB and the reference fundamental Gaussian beam. We also studied experimentally that the size of the generated PVB in the Fourier plane is independent of the TCs. Our approach to generate the PVB has the advantages of high-power tolerance and high efficiency.","PeriodicalId":20154,"journal":{"name":"Photonics","volume":"4 5","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139000901","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

Refractivity of P2O5-Al2O3-SiO2 Glass in Optical Fibers 光纤中 P2O5-Al2O3-SiO2 玻璃的折射率

IF 2.4 4区物理与天体物理

Photonics Pub Date : 2023-12-15 DOI: 10.3390/photonics10121383

M. Likhachev, T.S. Zaushitsyna, Vitaliya A. Agakhanova, Liudmila D. Iskhakova, S. Aleshkina, M. Bubnov, Alexey S. Lobanov, D. Lipatov

引用次数: 0

Slot-Waveguide Based All-Optical RF Spectrum Analyzer 基于槽波导的全光学射频频谱分析仪

IF 2.4 4区物理与天体物理

Photonics Pub Date : 2023-12-15 DOI: 10.3390/photonics10121380

Yuhua Li, Zhe Kang, W. Ho, R. Davidson, B. Little, S. Chu, Kun Zhu

引用次数: 0

Determination Position and Initial Value of Aspheric Surface for Fisheye Lens Design 确定鱼眼透镜设计中非球面的位置和初始值

IF 2.4 4区物理与天体物理

Photonics Pub Date : 2023-12-15 DOI: 10.3390/photonics10121381

Lirong Fan, Ketao Yan, Guodong Qiao, Lijun Lu, Shuyuan Gao, Huadong Zheng

{"title":"Determination Position and Initial Value of Aspheric Surface for Fisheye Lens Design","authors":"Lirong Fan, Ketao Yan, Guodong Qiao, Lijun Lu, Shuyuan Gao, Huadong Zheng","doi":"10.3390/photonics10121381","DOIUrl":"https://doi.org/10.3390/photonics10121381","url":null,"abstract":"The aspheric surface is a commonly used method to improve the imaging quality of the fisheye lens, but it is difficult to determine the position and initial value. Based on the wave aberration theory of the plane-symmetric optical system, a method of using an aspheric surface to design a fisheye lens is proposed, which can quickly determine the appropriate aspheric surface to improve the imaging performance. First, the wave aberration of each optical surface of the fisheye lens is calculated and its aberration characteristics are analyzed. Then, a numerical evaluation function is reported based on the aberration distribution of the fisheye lens on the image plane. According to the functional relationship between the evaluation function and the aspheric coefficient, the position of the aspheric surface and the initial value of the aspheric coefficient can be calculated. Finally, the adaptive and normalized real-coded genetic algorithm is used as the evaluation function to optimize the fisheye lens using an aspheric surface. The proposed method can provide an effective solution for designing a fisheye lens using an aspheric surface.","PeriodicalId":20154,"journal":{"name":"Photonics","volume":"54 7","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138997348","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

Quantum Cascade Lasers Grown by Metalorganic Chemical Vapor Deposition on Foreign Substrates with Large Surface Roughness 在表面粗糙度较大的外来基底上通过金属有机化学气相沉积法生长量子级联激光器

IF 2.4 4区物理与天体物理

Photonics Pub Date : 2023-12-14 DOI: 10.3390/photonics10121377

Shining Xu, Shuqi Zhang, J. Kirch, Cheng Liu, A. Wibowo, S. R. Tatavarti, D. Botez, L. Mawst

引用次数: 0

Tailoring the Direct Current Modulation Response of Electrically Pumped Semiconductor Nano-Laser Arrays 定制电泵半导体纳米激光器阵列的直流调制响应

IF 2.4 4区物理与天体物理

Photonics Pub Date : 2023-12-14 DOI: 10.3390/photonics10121373

Yuanlong Fan, Siyi An, K. A. Shore, Xiaopeng Shao

{"title":"Tailoring the Direct Current Modulation Response of Electrically Pumped Semiconductor Nano-Laser Arrays","authors":"Yuanlong Fan, Siyi An, K. A. Shore, Xiaopeng Shao","doi":"10.3390/photonics10121373","DOIUrl":"https://doi.org/10.3390/photonics10121373","url":null,"abstract":"Semiconductor nano-lasers have been a topic of interest from the perspective of advancing the capabilities of photonic integration. Nano-lasers are perceived as the means to achieve improved functionality in photonic integrated circuits. The properties and performance of nano-lasers have been examined by means of simulations and laboratory measurements. Nano-lasers lend themselves to integration to form dense arrays in both one and two dimensions. In a recent work, a theoretical treatment was presented for the dynamic behaviour of stand-alone electrically pumped nano-laser arrays. In this work, the response of nano-laser arrays to direct current modulation is examined. As in previous works, attention is given to two prototype array geometries: a linear three-element linear array and an equilateral triangular array. Large one-dimensional arrays can be built by repeating this elementary linear array. Two-dimensional photonic integrated circuits can incorporate the triangular arrays studied here. Such prototypical configurations offer opportunities to tailor the modulation response of the nano-laser arrays. The principal factors which provide that capability are the coupling strengths between lasers in the arrays and the direct modulation parameters. The former are fixed at the design and manufacture stage of the array whilst the latter can be chosen. In addition, the enhancement of the spontaneous emission rate via the so-called Purcell effect in nano-lasers offers a device-specific means for accessing a range of modulation responses. Two-dimensional portraits of the regimes of differing modulation responses offer a convenient means for determining the dynamics that may be accessed by varying the laser drive current. It is shown by these means that a rich variety of modulation responses can be accessed in both linear and triangular arrays.","PeriodicalId":20154,"journal":{"name":"Photonics","volume":"131 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138975479","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

Structural Optimization and Temperature Compensation of GMM-FBG Fiber Current Transducer GMM-FBG 光纤电流传感器的结构优化和温度补偿

IF 2.4 4区物理与天体物理

Photonics Pub Date : 2023-12-14 DOI: 10.3390/photonics10121376

Wei-Chao Zhang, Lin-Heng Li, Tao Zhang

{"title":"Structural Optimization and Temperature Compensation of GMM-FBG Fiber Current Transducer","authors":"Wei-Chao Zhang, Lin-Heng Li, Tao Zhang","doi":"10.3390/photonics10121376","DOIUrl":"https://doi.org/10.3390/photonics10121376","url":null,"abstract":"In order to improve the sensitivity and accuracy of the giant magnetostrictive material-fiber Bragg gratings’ (GMM-FBG) current sensor, in which the magnetostrictive modulator is Terfenol-D, the temperature effects on the FBG center wavelength and GMM magnetostriction coefficient are investigated to initiate an amending scheme in which temperature parameters are introduced into a GMM-FBG sensing model so as to calibrate current values. Based on electromagnetism theory, the magnetic structure is optimized in design to significantly increase the magnetic coupling efficiency and to homogenize magnetic distribution, employing finite element simulations of the electromagnetic field. The relevant experimental platform is constructed with a wavelength demodulation system. At the temperature range of 20~70 °C, response amplitudes of the current sensor are tested under various current values. The experimental results indicate that the sensitivity of the GMM-FBG current sensor decreases with the temperature increment and is also positively correlated to the target current. Through analyzing the response characteristics of the current sensor to temperature variation, a reasonable GMM-FBG sensing amelioration model with a temperature compensation coefficient is established based on a mathematical fitting method, according to which the current detecting accuracy can be increased by 4.8% while measuring 60 A current at the representative working temperature of 40 °C.","PeriodicalId":20154,"journal":{"name":"Photonics","volume":"1 4","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138972620","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

Refining the Performance of mid-IR CPA Laser Systems Based on Fe-Doped Chalcogenides for Nonlinear Photonics 改进基于掺铁卤化物的中红外 CPA 激光系统的性能，用于非线性光子学

IF 2.4 4区物理与天体物理

Photonics Pub Date : 2023-12-14 DOI: 10.3390/photonics10121375

A. Pushkin, F. Potemkin

{"title":"Refining the Performance of mid-IR CPA Laser Systems Based on Fe-Doped Chalcogenides for Nonlinear Photonics","authors":"A. Pushkin, F. Potemkin","doi":"10.3390/photonics10121375","DOIUrl":"https://doi.org/10.3390/photonics10121375","url":null,"abstract":"The chirped pulse amplification (CPA) systems based on transition-metal-ion-doped chalcogenide crystals are promising powerful ultrafast laser sources providing access to sub-TW laser pulses in the mid-IR region, which are highly relevant for essential scientific and technological tasks, including high-field physics and attosecond science. The only way to obtain high-peak power few-cycle pulses is through efficient laser amplification, maintaining the gain bandwidth ultrabroad. In this paper, we report on the approaches for mid-IR broadband laser pulse energy scaling and the broadening of the gain bandwidth of iron-doped chalcogenide crystals. The multi-pass chirped pulse amplification in the Fe:ZnSe crystal with 100 mJ level nanosecond optical pumping provided more than 10 mJ of output energy at 4.6 μm. The broadband amplification in the Fe:ZnS crystal in the vicinity of 3.7 μm supports a gain band of more than 300 nm (FWHM). Spectral synthesis combining Fe:ZnSe and Fe:CdSe gain media allows the increase in the gain band (~500 nm (FWHM)) compared to using a single active element, thus opening the route to direct few-cycle laser pulse generation in the prospective mid-IR spectral range. The features of the nonlinear response of carbon nanotubes in the mid-IR range are investigated, including photoinduced absorption under 4.6 μm excitation. The study intends to expand the capabilities and improve the output characteristics of high-power mid-IR laser systems.","PeriodicalId":20154,"journal":{"name":"Photonics","volume":"22 5","pages":""},"PeriodicalIF":2.4,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138972404","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

Propagation Properties of Generalized Schell-Model Pulse Sources in Dispersive Media 广义谢尔模型脉冲源在分散介质中的传播特性

IF 2.4 4区物理与天体物理

Photonics Pub Date : 2023-12-14 DOI: 10.3390/photonics10121378

Xiayin Liu, Zhiyu Cai, Xiaogang Wang, Bijun Xu

引用次数: 0