Iet Optoelectronics最新文献_第3页

Numerical simulation of a novel high performance solid-state dye-sensitised solar cell based on N719 dye 基于 N719 染料的新型高性能固态染料敏化太阳能电池的数值模拟

IF 2.3 4区计算机科学

Iet Optoelectronics Pub Date : 2024-06-06 DOI: 10.1049/ote2.12118

George G. Njema, Joshua K. Kibet, Nicholas Rono, Chinedu C. Ahia

{"title":"Numerical simulation of a novel high performance solid-state dye-sensitised solar cell based on N719 dye","authors":"George G. Njema, Joshua K. Kibet, Nicholas Rono, Chinedu C. Ahia","doi":"10.1049/ote2.12118","DOIUrl":"10.1049/ote2.12118","url":null,"abstract":"Among the emerging photovoltaic technologies, solid-state dye-sensitised solar cells (ssDSSCs) have attracted considerable interest due to their cost-effective production, adjustable characteristics, and potential for lightweight and flexible applications. Nevertheless, achieving efficiencies comparable to established technologies, such as perovskite and silicon-based solar devices, have proven challenging. Herein, the device structure, Pt/PEDOT: PSS/N719 dye/PC61BM/ITO is investigated theoretically using the solar cell capacitance simulator (SCAPS-1D). Groundbreaking advancement is introduced in ssDSSC design, achieving remarkable theoretical power conversion efficiency of 20.73%, surpassing the performance reported in traditional dye-based solar cell technologies. The model ssDSSC demonstrates an exceptional Fill factor of 86.64%, indicating efficient current collection; along with a modest short-circuit current density (Jsc) of 22.38 mA/cm2 and an impressive open-circuit voltage (Voc) of 1.0691 V, highlighting efficient light absorption and charge separation. Mott–Schottky capacitance analysis and parasitic resistances (series and shunt) have been thoroughly discussed. Despite the fact that only numerical simulation is involved, the proposed ssDSSCs structure gives insights into the fabrication of a highly efficient solar cell that can be injected into the production workflow in order to advance the photovoltaic technology of the solid-state DSSC.","PeriodicalId":13408,"journal":{"name":"Iet Optoelectronics","volume":"18 4","pages":"96-120"},"PeriodicalIF":2.3,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/ote2.12118","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141377279","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

In pursuit of high-fidelity waveguide imaging restoration using deep learning algorithms: A review 利用深度学习算法追求高保真波导成像复原：综述

IF 1.6 4区计算机科学

Iet Optoelectronics Pub Date : 2024-05-22 DOI: 10.1049/ote2.12113

Ruiqi Zhou, Yang Yang, Jiong Xiao, Zihang Liu, Feifei Hao, Jinwei Zeng, Jian Wang

{"title":"In pursuit of high-fidelity waveguide imaging restoration using deep learning algorithms: A review","authors":"Ruiqi Zhou, Yang Yang, Jiong Xiao, Zihang Liu, Feifei Hao, Jinwei Zeng, Jian Wang","doi":"10.1049/ote2.12113","DOIUrl":"10.1049/ote2.12113","url":null,"abstract":"Waveguide imaging is considered as one of the most important and widely used techniques in biomedical endoscopic applications. Recently, many attempts have been made to develop ever miniaturised in vivo imaging devices for minimally invasive clinical inspections. However, miniaturisation implies using a smaller optical aperture waveguide, which may introduce pixilation artefacts and pixel-to-pixel distortion to deteriorate overall imaging quality. To overcome the constraints imposed by miniaturised waveguides, the deep learning algorithms can be an effective tool to cure the imaging distortion via post-processing, which already had encouraging results in many scenes of automatic machine-learnt imaging restoration. The authors introduce the waveguide imaging transmission and the restoration algorithms, and then discuss their possible combinations. The results show that the integration of advanced waveguides and optimised algorithms can achieve unprecedented imaging restoration than before. In the future, in order to fill the need for high-quality reconstructed images, we should not only improve ability of software to optimise restoration algorithms but also correspondingly concern hardware progress in waveguides. The practical sense of it is to help researchers better master and take advantage of these combinations to make next generation high-fidelity endoscopes.","PeriodicalId":13408,"journal":{"name":"Iet Optoelectronics","volume":"18 3","pages":"49-62"},"PeriodicalIF":1.6,"publicationDate":"2024-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/ote2.12113","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141109662","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigating changes in the electric field profiles of transverse modes in fibres due to bending 研究纤维中横向模式的电场分布因弯曲而发生的变化

IF 1.6 4区计算机科学

Iet Optoelectronics Pub Date : 2024-05-15 DOI: 10.1049/ote2.12117

Sajjad Vazeerpour, Mahdi Shayganmanesh, Davoud Dorranian

引用次数: 0

Research on vibration pattern recognition based on phase-sensitive optical time domain reflectometry and voting fully convolution neural networks 基于相敏光学时域反射测量和投票全卷积神经网络的振动模式识别研究

IF 1.6 4区计算机科学

Iet Optoelectronics Pub Date : 2024-05-09 DOI: 10.1049/ote2.12116

Yunhong Liao, Ke Li, Yandong Gong

引用次数: 0

Point-to-point intensity modulation and direct detection flexible transceivers incorporating cascaded inverse fast fourier transform/fast fourier transform-based multi-channel aggregation/de-aggregation techniques 采用级联反快速傅里叶变换/基于快速傅里叶变换的多通道聚合/去聚合技术的点对点强度调制和直接检测柔性收发器

IF 1.6 4区计算机科学

Iet Optoelectronics Pub Date : 2024-02-27 DOI: 10.1049/ote2.12115

Lin Chen, Xinyu Wang, Wei Jin, Xiaoyu Huang, Gang Yang, Mingyang Jiang, Jianming Tang

{"title":"Point-to-point intensity modulation and direct detection flexible transceivers incorporating cascaded inverse fast fourier transform/fast fourier transform-based multi-channel aggregation/de-aggregation techniques","authors":"Lin Chen, Xinyu Wang, Wei Jin, Xiaoyu Huang, Gang Yang, Mingyang Jiang, Jianming Tang","doi":"10.1049/ote2.12115","DOIUrl":"10.1049/ote2.12115","url":null,"abstract":"Point-to-point (P2P) flexible transceivers are the key technical enabler to cost-effectively offer fast, dynamic, and ‘just-the-right-size’ ultra-dense P2P connectivity for various applications including remote equipment control and distributed fibre networks. However, existing flexible transceivers originally designed for hub-and-spoke traffic patterns are sub-optimal. To effectively address such technical issue, a P2P flexible transceiver incorporating a cascaded inverse fast fourier transform/fast fourier transform-based multi-channel aggregation/de-aggregation technique and analogue in-phase and quadrature (IQ) mixers is proposed and numerically evaluated in a 56Gbps@20 km intensity modulation and direct detection transmission system. The proposed P2P flexible transceivers not only support adaptive and flexible variations in both channel count and channel line rate but also offer additional physical layer network security.","PeriodicalId":13408,"journal":{"name":"Iet Optoelectronics","volume":"18 1-2","pages":"41-47"},"PeriodicalIF":1.6,"publicationDate":"2024-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/ote2.12115","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139981723","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Formation of optical planar waveguides on fused quartz by MeV ion implantation 通过 MeV 离子注入在熔融石英上形成光学平面波导

IF 1.6 4区计算机科学

Iet Optoelectronics Pub Date : 2024-02-13 DOI: 10.1049/ote2.12114

José-Miguel Zarate-Reyes, Erick Flores-Romero, Luis Rodríguez-Fernández, Yuriy Kudriavtsev, Juan-Carlos Cheang-Wong

{"title":"Formation of optical planar waveguides on fused quartz by MeV ion implantation","authors":"José-Miguel Zarate-Reyes, Erick Flores-Romero, Luis Rodríguez-Fernández, Yuriy Kudriavtsev, Juan-Carlos Cheang-Wong","doi":"10.1049/ote2.12114","DOIUrl":"10.1049/ote2.12114","url":null,"abstract":"The optical losses and the refractive index change of optical planar waveguides formed by MeV ion implantation were correlated with the experimental ion implantation parameters. Direct ion implantation was performed by means of carbon, silicon and copper ion beams impinging on the substrate surface at normal incidence. The ions were accelerated at energies ranging from 3 to 12 MeV with fluences varying from 1 × 1012 to 2 × 1016 ion/cm2, according to the type of implanted ion. The modification of the substrate refractive index due to the ion irradiation-induced damage was evaluated using the prism coupler method, and the refractive index profiles were determined by means of a reconstruction method using a multilayer structure approximation. The guiding properties of the waveguides were analysed using the fibre-coupling technique to determine both the optical transmission and transversal modes at 635 nm. The main practical relevance of our research is the obtention of high-quality waveguides at low current density MeV ion implantation (≤80 nA/cm2) without post-implantation annealing.","PeriodicalId":13408,"journal":{"name":"Iet Optoelectronics","volume":"18 1-2","pages":"32-40"},"PeriodicalIF":1.6,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/ote2.12114","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139728276","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Coding techniques for diversity enhancement of dense wavelength division multiplexing MIMO-FSO fault protection protocols systems over atmospheric turbulence channels 用于增强大气湍流信道上密集波分复用 MIMO-FSO 故障保护协议系统分集的编码技术

IF 1.6 4区计算机科学

Iet Optoelectronics Pub Date : 2024-02-06 DOI: 10.1049/ote2.12111

Ebrahim E. Elsayed, Mohammed R. Hayal, Irfan Nurhidayat, Mohd Asif Shah, Abdelrahman Elfikky, Ayman I. Boghdady, Davron Aslonqulovich Juraev, M. A. Morsy

{"title":"Coding techniques for diversity enhancement of dense wavelength division multiplexing MIMO-FSO fault protection protocols systems over atmospheric turbulence channels","authors":"Ebrahim E. Elsayed, Mohammed R. Hayal, Irfan Nurhidayat, Mohd Asif Shah, Abdelrahman Elfikky, Ayman I. Boghdady, Davron Aslonqulovich Juraev, M. A. Morsy","doi":"10.1049/ote2.12111","DOIUrl":"10.1049/ote2.12111","url":null,"abstract":"An enhanced transmission is presented in a multiple-input-multiple-output (MIMO) dense-wavelength division multiplexed (DWDM) free-space-optical (FSO) communication link using diversity coding techniques under the effect of turbulent weather phenomenon. The findings show good performance with an (8 channels × 2.5 Gbps data rate/channel) 20 Gbps 1500 m transmission distance. The bit-error-rate (BER), outage probability (OP), and signal-to-noise ratio (SNR) of the diversity combining techniques using maximum-ratio combining (MRC), selection combining (SC), and equal-gain combining (EGC) technique are evaluated in this work. The obtained results illustrate that Alamouti, space-time coding (STC), space-time block coding (STBC), space-time trellis code (STTC), orthogonal STBC (O-STBC), and quasi-orthogonal STBC (QO-STBC) on the minimum mean-square-error, and MRC are worth implementing on the DWDM-FSO wireless communication systems. The mitigation of atmospheric turbulence is achieved using MIMO diversity combining techniques coding. The simulation results for diversity coding techniques using QO-STBC/STTC and SC/MRC in the MIMO-DWDM FSO communication system can improve BER performance, OP, and SNR. The MRC exhibits the lowest OP and BER when compared with the SC and EGC. The numerical results demonstrate that the FSO communication link using DWDM QO-STBC/STTC improves the power penalty at both BER values under varying atmospheric turbulence conditions for ST, MT, and WT, in comparison to FSO systems without DWDM QO-STBC/STTC diversity coding techniques.","PeriodicalId":13408,"journal":{"name":"Iet Optoelectronics","volume":"18 1-2","pages":"11-31"},"PeriodicalIF":1.6,"publicationDate":"2024-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/ote2.12111","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139696327","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of reference sphere on test accuracy of Ritchey–Common method 参考球对里奇-康普法测试精度的影响

IF 1.6 4区计算机科学

Iet Optoelectronics Pub Date : 2024-01-16 DOI: 10.1049/ote2.12110

Shuo Zhu, Xiaohui Zhang

{"title":"Influence of reference sphere on test accuracy of Ritchey–Common method","authors":"Shuo Zhu, Xiaohui Zhang","doi":"10.1049/ote2.12110","DOIUrl":"10.1049/ote2.12110","url":null,"abstract":"The authors analyse the influence of reference sphere on the test accuracy of Ritchey–Common method during testing of flat mirror surface. A simulation model is established to simulate the influence of different radii of curvature of reference sphere on system wavefront. Then, the difference between the flat mirror surface result with reference sphere surface error to the actual flat mirror surface is examined by this model. The test accuracy of flat mirror result can be effectively improved by eliminating the influence of the surface error of reference sphere. When the surface accuracy of the reference sphere is better than 0.01 λ, the influence on RMS test accuracy is within 0.01 λ. R–C test path is built to test a 100 mm-diameter flat mirror surface, and its results are compared with those of the flat mirror surface without surface error of reference sphere and with the test result of the interferometer. When the surface accuracy of the actual used area of reference sphere is better than 0.01 λ, the effect on flat mirror RMS accuracy is within 0.01 λ. The RMS test accuracy can reach 0.01 λ, when the surface error of reference sphere is retained. The experiment verifies the correctness of the simulation results and guarantees the improvement in the test accuracy of R–C method.","PeriodicalId":13408,"journal":{"name":"Iet Optoelectronics","volume":"18 1-2","pages":"1-10"},"PeriodicalIF":1.6,"publicationDate":"2024-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/ote2.12110","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139474577","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improving the performance of high-sensitivity surface plasmon resonance biosensor with 2D nanomaterial coating (BP-WS2) based on hybrid structure: Theoretical analysis 基于混合结构的二维纳米材料涂层（BP-WS2）提高高灵敏度表面等离子体共振生物传感器的性能：理论分析

IF 1.6 4区计算机科学

Iet Optoelectronics Pub Date : 2023-12-10 DOI: 10.1049/ote2.12109

Rita Fatanat Didar, Hamid Vahed

引用次数: 0

Ensemble learning based defect detection of laser sintering 基于集成学习的激光烧结缺陷检测

IF 1.6 4区计算机科学

Iet Optoelectronics Pub Date : 2023-10-30 DOI: 10.1049/ote2.12108

Junyi Xin, Muhammad Faheem, Qasim Umer, Muhammad Tausif, M. Waqar Ashraf

{"title":"Ensemble learning based defect detection of laser sintering","authors":"Junyi Xin, Muhammad Faheem, Qasim Umer, Muhammad Tausif, M. Waqar Ashraf","doi":"10.1049/ote2.12108","DOIUrl":"10.1049/ote2.12108","url":null,"abstract":"In rapid development, Selective Laser Sintering (SLS) creates prototypes by processing industrial materials, for example, polymers. Such materials are usually in powder form and fused by a laser beam. The manufacturing quality depends on the interaction between a high-energy laser beam and the powdered material. However, in-homogeneous temperature distribution, unstable laser powder, and inconsistent powder densities can cause defects in the final product, for example, Powder Bed Defects. Such factors can lead to irregularities, for example, warping, distortion, and inadequate powder bed fusion. These irregularities may affect the profitable SLS production. Consequently, detecting powder bed defects requires automation. An ensemble learning-based approach is proposed for detecting defects in SLS powder bed images from this perceptive. The proposed approach first pre-processes the images to reduce the computational complexity. Then, the Convolutional Neural Network (CNN) based ensembled models (off-the-shelf CNN, bagged CNN, and boosted CNN) are implemented and compared. The ensemble learning CNN (bagged and boosted CNN) is good for powder bed detection. The evaluation results indicate that the performance of bagged CNN is significant. It also indicates that preprocessing of the images, mainly cropping to the region of interest, improves the performance of the proposed approach. The training and testing accuracy of the bagged CNN is 96.1% and 95.1%, respectively.","PeriodicalId":13408,"journal":{"name":"Iet Optoelectronics","volume":"17 6","pages":"273-283"},"PeriodicalIF":1.6,"publicationDate":"2023-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/ote2.12108","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71512830","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0