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2022 4th West Asian Symposium on Optical and Millimeter-wave Wireless Communications (WASOWC)最新文献

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Absorption Enhancement in Photodetectors Based on T-Shaped Coupled Nano-Antenna for Free-Space Optical Communications Applications 基于t形耦合纳米天线的光电探测器在自由空间光通信中的吸收增强
2022 4th West Asian Symposium on Optical and Millimeter-wave Wireless Communications (WASOWC) Pub Date : 2022-05-12 DOI: 10.1109/wasowc54657.2022.9798437
Ghazal Abdi, S. Golmohammadi
{"title":"Absorption Enhancement in Photodetectors Based on T-Shaped Coupled Nano-Antenna for Free-Space Optical Communications Applications","authors":"Ghazal Abdi, S. Golmohammadi","doi":"10.1109/wasowc54657.2022.9798437","DOIUrl":"https://doi.org/10.1109/wasowc54657.2022.9798437","url":null,"abstract":"Free-space optical communication is widely regarded as the next-generation high-speed wireless communication technology, and todays many attempts are aimed to improving its performance. Design of suitable photodetectors that effectively absorb light in the optical communication wavelengths range can lead to significant improvements in FSO communication; because in the FSO systems the modulated beam is transferred in free space without any optical fiber cable, and a major limiting factor for FSO is the beam divergence, which can be solved by changing the operating wavelength to 1.55μm. So, the photodetector and its optical absorption in this wavelength plays an important role. In this study, we have designed a metal-dielectric-graphene (MDG) photo detector, employing T-shaped coupled nano-antennas, and the graphene absorption, as photo-generated carrier channel in the photodetector, under different conditions is investigated. We demonstrated that the photodetector absorption at 1.55μm wavelength reaches to 38%, approximately, and only has one peak that is very suitable for the photodetector performance.","PeriodicalId":306222,"journal":{"name":"2022 4th West Asian Symposium on Optical and Millimeter-wave Wireless Communications (WASOWC)","volume":"45 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131163117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Microcavity- Integrated Graphene Photodetector for Mid-IR Free Space Communications 用于中红外自由空间通信的微腔集成石墨烯光电探测器
2022 4th West Asian Symposium on Optical and Millimeter-wave Wireless Communications (WASOWC) Pub Date : 2022-05-12 DOI: 10.1109/wasowc54657.2022.9798418
H. Soofi, Mohammad Reza Ostovar
{"title":"Microcavity- Integrated Graphene Photodetector for Mid-IR Free Space Communications","authors":"H. Soofi, Mohammad Reza Ostovar","doi":"10.1109/wasowc54657.2022.9798418","DOIUrl":"https://doi.org/10.1109/wasowc54657.2022.9798418","url":null,"abstract":"In this article a micro-cavity integrated graphene photodetector is proposed and numerically investigated for free space communications at mid-IR and long-IR wavelength domains. The structure is composed of single graphene layer(s) sandwiched between two distributed Bragg reflectors (DBRs). Light absorption in graphene is enhanced due to the cavity resonance reaching values as high as 80% of the incoming light power. Generated photo-carriers move toward the electrical contacts under an applied drain-source voltage. Responsivity of the photodetector at a wavelength of $lambda=4.51mumathrm{m}$ reaches values of 15 mA/W and 300 mA/W for $mathbf{V}_{mathbf{DS}}=0.2$ V and $mathbf{V}_{mathbf{DS}}=4$ V respectively.","PeriodicalId":306222,"journal":{"name":"2022 4th West Asian Symposium on Optical and Millimeter-wave Wireless Communications (WASOWC)","volume":"125 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127228676","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
ONU placement in FiWi network using enhanced backtracking search algorithm 利用增强的回溯搜索算法在FiWi网络中放置ONU
2022 4th West Asian Symposium on Optical and Millimeter-wave Wireless Communications (WASOWC) Pub Date : 2022-05-12 DOI: 10.1109/wasowc54657.2022.9797912
H. Emami
{"title":"ONU placement in FiWi network using enhanced backtracking search algorithm","authors":"H. Emami","doi":"10.1109/wasowc54657.2022.9797912","DOIUrl":"https://doi.org/10.1109/wasowc54657.2022.9797912","url":null,"abstract":"Fiber-wireless (FiWi) access network is an integration of wireless and fiber networks. FiWi network is popular due to its mobility, flexibility, robustness, and high bandwidth. A challenging issue in the FiWi network is to determine the optimal position of optical network units (ONUs) to decrease system cost and increase system stability, throughput and performance. In recent years, some optimization meta-heuristics for ONU placement were proposed and achieved promising results. However, the performance of existing methods is not ideal. This paper presents an enhanced backtracking search algorithm (EBSA) for the ONU placement. The goal is to minimize the overall distance between wireless users and ONUs. The experimental results on the ONU placement scenarios show that the proposed EBSA algorithm outperformed the standard BSA, HHO, and CLS-LFD algorithms.","PeriodicalId":306222,"journal":{"name":"2022 4th West Asian Symposium on Optical and Millimeter-wave Wireless Communications (WASOWC)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116795575","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Design and Optimization of Gregorian-based Reflector Systems for THz Imaging System Optics 太赫兹成像系统光学中格里高利反射系统的设计与优化
2022 4th West Asian Symposium on Optical and Millimeter-wave Wireless Communications (WASOWC) Pub Date : 2022-02-14 DOI: 10.1109/wasowc54657.2022.9798429
Mohammad Hossein Koohi Ghamsari, M. Ahmadi-Boroujeni, S. Babanejad
{"title":"Design and Optimization of Gregorian-based Reflector Systems for THz Imaging System Optics","authors":"Mohammad Hossein Koohi Ghamsari, M. Ahmadi-Boroujeni, S. Babanejad","doi":"10.1109/wasowc54657.2022.9798429","DOIUrl":"https://doi.org/10.1109/wasowc54657.2022.9798429","url":null,"abstract":"The application of reflector antenna configurations in designing the optical section of terahertz imaging systems has attracted great attention in recent years. The advantages of reflective optics in comparison with refractive optics is one of the main reasons for this trend. Specular reflection in a broad spectral range, no or little reflection and transmission loss, no chromatic aberration, and high reliability in high power applications configuration are just some of these advantages. In this paper, the optical performance of a modified off-axis aberrations-free Gregorian-based reflector antenna system is studied as an optical section of a terahertz imaging system. By applying a precise optimization procedure, the optical and imaging performance of the reflective structure is optimized with respect to the proposed optimization goals. Furthermore, it will be shown that although the apparent complexity of the overall configuration, by carefully utilizing the optical techniques, a near-ideal focusing optics is achievable.","PeriodicalId":306222,"journal":{"name":"2022 4th West Asian Symposium on Optical and Millimeter-wave Wireless Communications (WASOWC)","volume":"314 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115284529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
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