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50 GHz optical true time delay beamforming in hybrid optical/mm-wave access networks with multi-core optical fiber distribution

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Chinese Optics Letters 2018年第4期16卷 25-29页

作者： álvaro Morales idelfonso tafur monroy Fredrik Nordwall Tommi Sφrensen Department of Electrical Engineering Electro-Optical Communications Eindhoven University of Technology 5600 MB Eindhoven The Netherlands Tektronix AB Kista Sweden GoMeasure ApS Albertslund Denmark

We propose and experimentally validate an optical true time delay beamforming scheme with straightforward integration into hybrid optical/millimeter（mm）-wave access networks. In the proposed approach, the most complex functions, including the beamforming network, are implemented in a central office, reducing the complexity and cost of remote antenna units. Different cores in a multi-core fiber are used to distribute the modulated signals to high-speed photodetectors acting as heterodyne mixers. The mm-wave carrier frequency is fixed to 50 GHz（VBand）, thereby imposing a progressive delay between antenna elements of a few picoseconds. That true time delay is achieved with an accuracy lower than 1 ps and low phase noise.

关键词： MCF GHz optical true time delay beamforming in hybrid optical/mm-wave access networks with multi-core optical fiber distribution

Electron beam pumping improves the conversion efficiency of low-frequency photons radiated by perovskite quantum dots

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Chinese Physics B 2023年第4期32卷 754-761页

作者：杜鹏母一宁任航 idelfonso tafur monroy 李彦正樊海波王帅 Makram Ibrahim 梁栋 School of Physics Changchun University of Science and TechnologyChangchun 130022China Institute for Photonic Integration Eindhoven University of TechnologyEindhoven 5600 MBNetherlands Science and Technology on Low-Light-Level Night Vision Laboratory Xi’an 710018China Kunming Institute of Physics Kunming 650221China Solar and Space Research Department National Research Institute of Astronomy and Geophysics(NRIAG)Cairo 11421Egypt

This research argues that using an electron beam with high kinetic energy to pump perovskite quantum dots can significantly boost the efficiency of the low-frequency photon radiation ***,we measure the random lasing threshold and luminescence threshold of CsPbX_(3)films pumped by an electron ***,we simulate the spatial distribution of the electron beams in CsPbX_(3)*** with the above data,a low-frequency photon radiation conversion model based on the electron pumped perovskite quantum dots is *** could be a way to create a terahertz source with a high-power output or to multiply the terahertz power.

关键词： electron beam perovskite quantum dots THz

Experimental Investigation of Transmission Properties and All-Optical Label Swapping of Orthogonal IM/FSK Labeled Signals

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光学学报 2003年第S1期23卷 679-680页

作者： Pablo V. Holm-Nielsen Christophe Peucheret idelfonso tafur monroy Palle Jeppesen Research Center COM Technical University of Denmark 2800 Kgs. Lyngby DenmarkResearch Center COM Technical University of Denmark 2800 Kgs. Lyngby DenmarkCOBRA Research Institute Eindhoven University of Technology The NetherlandsResearch Center COM Technical University of Denmark 2800 Kgs. Lyngby Denmark

OpticallylabeledIM/FSKsign***-optical label swapping based on MZ-SOA and EAM is presented. Transmission followed by label swapping shows a 2dB overall power penalty.

关键词： FSK on of IM Experimental Investigation of Transmission Properties and All-Optical Label Swapping of Orthogonal IM/FSK Labeled Signals EAM SOA that into

Range Extension and Channel Capacity Increase in Impulse-Radio Ultra-Wideband Communications

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Tsinghua Science and Technology 2010年第2期15卷 169-173页

作者： Roberto Rodes Antonio Caballero Jesper Bevensee Jensen Timothy Braidwood Gibbon Neil Guerrero Gonzalez idelfonso tafur monroy DTU Fotonik Department of Photonics Engineering Technical University of Denmark

We theoretically analyze the channel capacity of a 5th-order Gaussian pulse-based ultra-wideband （UWB） system and experimentally demonstrate 2 Gbit/s UWB-over-fiber transmission systems incorporating wireless transmission. Both electrical and photonic UWB pulse generation methods are employed and its performance is compared. By utilizing optimum UWB pulse design and employing a digital signal processing （DSP） receiver, a bit-error-rate above the forward error correction （FEC） limit for 8 meters of wireless＇emis- sion is obtained in our photonic generation UWB system. A noticeable increase in the channel capacity is achieved compared to previously reported results.

关键词： impulse radio ultra-wideband UWB-over-fiber channel capacity personal area networks

电环形谐振腔表面几何参数对太赫兹超材料吸收体性能的影响（英文）

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中国光学 2018年第1期11卷 47-59页

作者： GOMON Daniel SEDYKH Egor RODRíGUEZ Sebastian idelfonso tafur monroy ZAITSEV Kirill VOZIANOVA Anna KHODZITSKY Mikhail ITMO大学俄罗斯圣彼得堡197101 埃因霍温技术大学荷兰埃因霍温鲍曼莫斯科国立技术大学俄罗斯莫斯科105005

本文分析了电环形谐振腔的几何参数对超材料吸收体吸收率的影响。文中详细分析了电环形谐振腔参数、介电层(间隔物)厚度和电环形谐振腔厚度对超材料吸收体的影响,在此基础上,设置正交实验分析了几种参数的综合影响,最终获得超材料的理... 详细信息

本文分析了电环形谐振腔的几何参数对超材料吸收体吸收率的影响。文中详细分析了电环形谐振腔参数、介电层(间隔物)厚度和电环形谐振腔厚度对超材料吸收体的影响,在此基础上,设置正交实验分析了几种参数的综合影响,最终获得超材料的理论吸收率。根据上述结果,制备了2个超材料吸收体的原理样机,经实验测得,原理样机的窄带吸收率高于98%。本文的研究成果为高性能吸收器的设计提供了指导。

关键词：超材料光谱太赫兹吸收器

Beam steering application for W-band data links with moving targets in 5G wireless networks

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Journal of Communications and Information Networks 2017年第2期2卷 91-100页

作者： Alvaro Morales Sebastian Rodrguez Omar Gallardo Juan Jose Vegas Olmos idelfonso tafur monroy Technical University of Denmark Department of Photonics EngineeringOersteds PladsBuilding 343Kongens Lyngby 2800Denmarkl 2.Saint-Petersburg National Research University of Information TechnologiesMechanics and OpticsKronverksky prospektSaint Petersburg 197101Russian Federation

Abstract:Ubiquitous broadband Internet access is one of the major goals of the next generation of wireless ***,there are still some locations where this is diffcult to *** is the case on moving vehicles and,particularly,on *** the possible solutions to this problem,RoF(Radio-over-Fiber)architectures have been proposed as low-latency,cost-e ective *** elements are introduced to extend the RoF ***,the carrier frequency is raised into the W-band(75-110 GHz)to increase the available ***,a mechanical beam-steering solution based on a Stewart platform is adopted for the transmitter antenna to allow it to follow a moving receiver along a known path,thereby enhancing the coverage *** performance of a system transmitting a 2.5 Gbit/s non-return-to-zero signal generated by photonic up-conversion over a wireless link is evaluated in terms of real-time BER(Bit Error Rate)*** receiver is situated in di erent positions,and the orientation of the transmitter is changed *** below the forward error correction limit for 7%overhead are obtained over a range of 60 cm around a center point situated 2 m away from the transmitter.

关键词： 5G mobile communications mechanical steering millimeter-wave communications photonic up-conversion vehicular communications

HVOF-sprayed HAp/S53P4 BG composite coatings on an AZ31 alloy for potential applications in temporary implants

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Journal of Magnesium and Alloys 2024年第1期12卷 345-360页

作者： Carlos A.Poblano-Salas John Henao Astrid L.Giraldo-Betancur Paola Forero-Sossa Diego German Espinosa-Arbelaez Jorge A.González-Sánchez Luis R.Dzib-Pérez Susana T.Estrada-Moo idelfonso E.Pech-Pech CIATEQ A.C. Av.Manantiales 23-AParque Industrial Bernardo QuintanaEl MarquésQuerétaro 76246Mexico CONAHCYT-CIATEQ A.C. Av.Manantiales 23-AParque Industrial Bernardo QuintanaEl MarquésQuerétaro 76246Mexico CONAHCYT-Cinvestav Libramiento Norponiente#2000.Fraccionamiento Real de JuriquillaQuerétaro 76230Mexico Universidad Tecnológica de Querétaro Av.Pie de la Cuesta N°2501Querétaro 76148Mexico CIDESI Av.Playa Pie de la Cuesta No 702Col.San PabloQuerétaro 76125Mexico Center for Corrosion Research Autonomous University of CampecheAv.Héroe de Nacozari No.480P.C.24070San Francisco de CampecheCam.Mexico

Bioactive thermal spray coatings produced via high-velocity oxygen fuel spray(HVOF)from hydroxyapatite(HAp)and bioactive glasses(BG)have the potential to be employed on temporary implants due to the ability of both HAp and BG to dissolve and promote osseointegration,considering that both phases have different reaction and dissolution rates under in-vitro *** the present work,75%***-25%wt.S53P4 bioactive glass powders were HVOF-sprayed to obtain HAp/S53P4 BG composite coatings on a bioresorbable AZ31 *** study is focused on exploring the effect of the stand-off distance and fuel/oxygen ratio variation as HVOF parameters to obtain stable structural coatings and to establish their effect on the phases and microstructure produced in those *** characterization techniques,such as scanning electron microscopy,X-ray diffraction,and Fourier transform infrared spectroscopy,were employed to characterize relevant structural and microstructural properties of the composite *** results showed that thermal gradients during coating deposition must be managed to avoid delamination due to the high temperature achieved(max 550℃)and the differences in coefficients of thermal *** was also found that both spraying distance and oxygen/fuel ratio allowed to keep the hydroxyapatite as the main phase in the *** addition,in-vitro electrochemical studies were performed on the obtained HAp/S53P4 BG composite coatings and compared against the uncoated AZ31 *** results showed a significant decrease in hydrogen evolution(at least 98%)when the bioactive coating was applied on the Mg alloy during evaluation in simulated body fluid(SBF).

关键词： Coatings Composites Thermal spray Temporary implants Hydrogen evolution

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电子束泵浦钙钛矿量子点薄膜发光机理

光学学报 2022年第19期42卷 192-199页

作者：任航母一宁杜鹏李彦正樊海波王帅 monroy idelfonso tafur Ibrahim Makram 长春理工大学物理学院吉林长春130022 长春理工大学重庆研究院重庆401122 微光夜视技术重点实验室陕西西安710018 昆明物理研究所云南昆明650221 埃因霍芬理工大学光电子集成研究中心荷兰埃因霍芬5600 MB 埃及国家天文与地球物理研究所空间太阳能研究部埃及开罗11421

为了对电子束泵浦钙钛矿量子点器件的建模与设计提供理论支撑,探究了电子束泵浦钙钛矿量子点膜层发光的微观过程,揭示了其能量转化模型与发光机理。首先从理论层面分析了电子束泵浦钙钛矿量子点发光与激射的微观物理过程,指出电子束泵... 详细信息

为了对电子束泵浦钙钛矿量子点器件的建模与设计提供理论支撑,探究了电子束泵浦钙钛矿量子点膜层发光的微观过程,揭示了其能量转化模型与发光机理。首先从理论层面分析了电子束泵浦钙钛矿量子点发光与激射的微观物理过程,指出电子束泵浦量子点发光的激射阈值与发光阈值是构建其能量转化模型所需检测的宏观物理约束边界。分析讨论了其激射阈值与发光阈值的有效检测方法,并多次开展了具体的评估实验。最后,结合检测物理约束边界,模拟并构建了钙钛矿量子点膜层内部发光能量转化效率、纳米晶极化分布随电子束泵浦强度变化的关系。

关键词：量子光学钙钛矿量子点电子束泵浦随机激射发光效率极化分布

电子束泵浦钙钛矿纳米晶随机激射的瞬态发光特性

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光子学报 2020年第4期49卷 141-147页

作者：杜鹏母一宁任航樊海波朱焱李彦正 idelfonso monroy 长春理工大学理学院长春130022 埃因霍温理工大学集成光子研究所荷兰埃因霍温5600 MB

为了满足瞬态光学系统对瞬时显像技术的要求,提出了一种基于钙钛矿纳米晶随机激射的瞬时发光方法.从CsPbBr3纳米晶薄膜的制备与表征出发,分析了该类有源薄膜的制备方法与手段.结合应用需要,设计了以微通道板为核心的电子束泵浦结构,并... 详细信息

为了满足瞬态光学系统对瞬时显像技术的要求,提出了一种基于钙钛矿纳米晶随机激射的瞬时发光方法.从CsPbBr3纳米晶薄膜的制备与表征出发,分析了该类有源薄膜的制备方法与手段.结合应用需要,设计了以微通道板为核心的电子束泵浦结构,并通过实验验证了CsPbBr3纳米晶薄膜在电子束泵浦下的激射效果,分析了其激射原理与物理现象.最后通过瞬时光泵浦的方法验证了CsPbBr3纳米晶薄膜的瞬时优势.该新型显像薄膜的瞬时探测系统中,不但具有较好的瞬态特性与时间分辨率,而且还可以利用电子束泵浦诱发激射来形成第二级的光放大,进而提升器件的整体探测能力.

关键词：钙钛矿纳米晶随机激射电子束泵浦瞬态成像微通道板