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2017 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC)最新文献

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High-quality phase-shifted Bragg grating sensor inscribed with only one laser pulse in a polymer optical fiber 高质量的相移布拉格光栅传感器，仅在聚合物光纤中嵌入一个激光脉冲
2017 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC) Pub Date : 2017-12-01 DOI: 10.1109/IMOC.2017.8121046
C. Marques, A. Pospori, L. Pereira, S. Marques, P. Antunes, O. Bang, D. Webb, P. André
{"title":"High-quality phase-shifted Bragg grating sensor inscribed with only one laser pulse in a polymer optical fiber","authors":"C. Marques, A. Pospori, L. Pereira, S. Marques, P. Antunes, O. Bang, D. Webb, P. André","doi":"10.1109/IMOC.2017.8121046","DOIUrl":"https://doi.org/10.1109/IMOC.2017.8121046","url":null,"abstract":"We present the first phase-shifted polymer optical fiber Bragg grating sensor inscribed with only one KrF laser pulse. The phase shift defect was created directly during the grating inscription process by placing a very narrow blocking aperture, in the center of the UV beam. One laser pulse with a duration of 15 ns and energy 6.3 mJ is adequate to introduce a refractive index change of 0.69×10−4 in the fiber core. The high-quality produced Bragg grating structure rejects 16.3 dB transmitted power, thus providing 97.6% reflectivity, which is well suited for photonic applications. The transmission notch depth is about 10 dB and very sharp notches of 3 dB width ranging from 14 pm is reported. The temperature, strain, and pressure response of the sensor has been characterized showing promising results in applications that require high-precision measurements. The ability to inscribe these high-quality sensors effectively can significantly reduce their production cost in industry.","PeriodicalId":171284,"journal":{"name":"2017 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129188519","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: 2
On the feasibility of mode-division multiplexed transmission over few-mode fibres 在多模光纤上分模复用传输的可行性
2017 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC) Pub Date : 2017-12-01 DOI: 10.1109/IMOC.2017.8121160
F. Ferreira, C. Costa, S. Sygletos, A. Ellis
{"title":"On the feasibility of mode-division multiplexed transmission over few-mode fibres","authors":"F. Ferreira, C. Costa, S. Sygletos, A. Ellis","doi":"10.1109/IMOC.2017.8121160","DOIUrl":"https://doi.org/10.1109/IMOC.2017.8121160","url":null,"abstract":"This paper reviews our most recent results on mode-division multiplexing systems based on few-mode fibres with low differential mode delay, spanning from the fibre design optimization to the receiver memory dimensioning. First, the fibre refractive-index profile is optimized for low differential mode delay and low macro-bend losses. Afterwards, we present a semi-analytical model of the linear mode coupling induced by fibre imperfections and stress. Finally, the interplay between the linear mode coupling and the differential mode delay is studied numerically and analytically, allowing to quantify the receiver memory required for a given fibre span.","PeriodicalId":171284,"journal":{"name":"2017 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131365616","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: 3
A low-cost modular transmit front-end with analog beamforming capability 具有模拟波束形成能力的低成本模块化发射前端
2017 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC) Pub Date : 2017-08-30 DOI: 10.1109/IMOC.2017.8121119
D. L. Lemes, M. Heckler, A. Winterstein
{"title":"A low-cost modular transmit front-end with analog beamforming capability","authors":"D. L. Lemes, M. Heckler, A. Winterstein","doi":"10.1109/IMOC.2017.8121119","DOIUrl":"https://doi.org/10.1109/IMOC.2017.8121119","url":null,"abstract":"In this paper, we present a radio frequency (RF) transmitter front-end that can be used in analog beamforming applications. The proposed system is modular and can be employed at different frequencies whereby C-band operation is shown. Using low-cost components and substrates, this design makes analog beamforming affordable also for commercial applications with unit costs below 130 € and expected overall gain of 11.1 dB. We demonstrate the system performance in terms of S-parameter measurements with frequency translation to 7.0 GHz. Reproducibility of the achieved results is shown by analyzing multiple front-end prototypes. The beamforming capability is verified by antenna pattern measurements with an eight-element array.","PeriodicalId":171284,"journal":{"name":"2017 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC)","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131682860","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: 3
Negative group delay in lumped-element C-L transmission lines 集总元C-L传输线的负群延迟
2017 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC) Pub Date : 2017-08-01 DOI: 10.1109/IMOC.2017.8121024
J. Barroso, J. E. B. Oliveira, O. Coutinho, U. Hasar
{"title":"Negative group delay in lumped-element C-L transmission lines","authors":"J. Barroso, J. E. B. Oliveira, O. Coutinho, U. Hasar","doi":"10.1109/IMOC.2017.8121024","DOIUrl":"https://doi.org/10.1109/IMOC.2017.8121024","url":null,"abstract":"Superluminal group velocities, i. e., velocities greater than the speed of light in vacuum, infinite or even negative, have been experimentally observed in the optical, electronic, and microwave domains. Such velocities in no way contradict special relativity because group velocity does not represent, in general, the velocity of a signal or information. Although it may seem counterintuitive, superluminal phenomena and the resulting negative-group-delay (NGD) effects find a variety of applications such as ultra-wide-band phase shifters, high-speed microelectronic interconnections, pulse shaping, delay control, dispersion compensations, and wave-packet switching, for instance. This paper reports on negative group velocities in a lumped C-L line, where capacitors C and inductors L connected to resistors are placed, respectively, in the series and shunt branches of the periodic line. The NGD effects are induced by ohmic dissipation due to the resistors which establish a frequency range in which NGD propagation is allowed. This finding is numerically demonstrated by injecting into the line a 180 kHz modulated Gaussian pulse, with a full width at half maximum of 22.20 μ«, for which the negative time delay of −1.26 μs determined from the numerical solution of circuit equations is in good agreement with that predicted by the analytical dispersion relation of the periodic structure.","PeriodicalId":171284,"journal":{"name":"2017 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116954376","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
A simple reduced size and reconfigurable element for multiband and angular stable frequency selective surface 一个简单的缩小尺寸和可重构元件，用于多波段和角稳定频率选择表面
2017 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC) Pub Date : 2017-08-01 DOI: 10.1109/IMOC.2017.8121150
V. P. S. Neto, M. J. Duarte, Francinete de Lima, A. D’assunção
{"title":"A simple reduced size and reconfigurable element for multiband and angular stable frequency selective surface","authors":"V. P. S. Neto, M. J. Duarte, Francinete de Lima, A. D’assunção","doi":"10.1109/IMOC.2017.8121150","DOIUrl":"https://doi.org/10.1109/IMOC.2017.8121150","url":null,"abstract":"This paper presents a simple, compact, and reconfigurable patch element geometry for multiband FSS applications. The patch element reconfigurability enables the development of reconfigurable FSS structures. The proposed FSS reconfigurability is theoretically and experimentally investigated through the use of small thin conducting strips on the FSS patch element geometry. Simulation is performed using Ansoft HFSS software. It is shown that the proposed FSS structure in different configurations can be used to cover a wide frequency range, with very good angular stability (with respect to the oblique incidence of plane waves), being suitable for wireless communication applications and cognitive radio. Simulation and measurements results are compared and a good agreement is verified.","PeriodicalId":171284,"journal":{"name":"2017 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127175081","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
Guard time requirements for SOA-based electro-optical space switches and AM signals 基于soa的光电空间开关和调幅信号的保护时间要求
2017 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC) Pub Date : 2017-08-01 DOI: 10.1109/IMOC.2017.8121018
T. Sutili, Bruno Taglietti, R. Figueiredo, Cristiano de Mello Gallep, E. Conforti
{"title":"Guard time requirements for SOA-based electro-optical space switches and AM signals","authors":"T. Sutili, Bruno Taglietti, R. Figueiredo, Cristiano de Mello Gallep, E. Conforti","doi":"10.1109/IMOC.2017.8121018","DOIUrl":"https://doi.org/10.1109/IMOC.2017.8121018","url":null,"abstract":"The transient and steady state performances of optical space switches based on semiconductor optical amplifiers (SOAs) switching an optical carrier modulated in amplitude through several switching techniques and operating parameters were characterized. The analysis was focused on the switch's guard time, resulting from the sum of its rise time and ringing time, and the switching amplitude, related with the modulated bits vertical opening when the switch is at on or off operating states and the switching pulse optical amplitude. The results point to the SOA optimum operating region, in relation to the analyzed parameters, which is defined by low bias current (between 60 mA and 80 mA) and high step amplitude (above 2 V).","PeriodicalId":171284,"journal":{"name":"2017 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC)","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127336881","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: 6
Analytical model for magnetooptic five-layered planar waveguides 磁光五层平面波导的解析模型
2017 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC) Pub Date : 2017-08-01 DOI: 10.1109/IMOC.2017.8121106
Licinius Dimitri Sá de Alcantara, C. D. De Francisco, B. Borges
{"title":"Analytical model for magnetooptic five-layered planar waveguides","authors":"Licinius Dimitri Sá de Alcantara, C. D. De Francisco, B. Borges","doi":"10.1109/IMOC.2017.8121106","DOIUrl":"https://doi.org/10.1109/IMOC.2017.8121106","url":null,"abstract":"This work presents an analytical formalism for magnetooptic five-layered planar waveguides, which can be used as a fast resource to assist in the design of nonreciprocal optical couplers. The methodology was implemented in a GNU Octave program code and results are shown for both forward and backward guided propagation.","PeriodicalId":171284,"journal":{"name":"2017 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116227055","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
Performance evaluation of a real time OFDM radio over fiber system at 2.5 GHz using software defined radio SDR 基于软件定义无线电SDR的2.5 GHz光纤系统实时OFDM无线电性能评估
2017 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC) Pub Date : 2017-08-01 DOI: 10.1109/IMOC.2017.8121094
Juan David Cepeda, Santiago Isaac Rodríguez, Mónica Rico-Martínez, Christian Daniel Muñoz, M. Varón, I. Monroy
{"title":"Performance evaluation of a real time OFDM radio over fiber system at 2.5 GHz using software defined radio SDR","authors":"Juan David Cepeda, Santiago Isaac Rodríguez, Mónica Rico-Martínez, Christian Daniel Muñoz, M. Varón, I. Monroy","doi":"10.1109/IMOC.2017.8121094","DOIUrl":"https://doi.org/10.1109/IMOC.2017.8121094","url":null,"abstract":"This paper presents the implementation of an OFDM radio over fiber (RoF) system at 2.5 GHz using software defined radio (SDR). In this work, first we present an introduction of the main concepts about radio over fiber and an orthogonal frequency-division multiplexing (OFDM) system at 2.5 GHz, then we present a comparison of an OFDM RoF system in three scenarios, modifying the wireless distances and the optical fiber distance in order to evaluate the performance of the system taking into account the symbol error rate (SER) vs signal to noise ratio (SNR) curves.","PeriodicalId":171284,"journal":{"name":"2017 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121330695","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: 4
Sparse array of dielectric resonator antennas for ultra-wide band applications 用于超宽带应用的介质谐振器天线稀疏阵列
2017 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC) Pub Date : 2017-08-01 DOI: 10.1109/IMOC.2017.8121161
L. Gabrielli, L. P. de Oliveira, G. N. Malheiros-Silveira, J. Pita, H. Hernández-Figueroa
{"title":"Sparse array of dielectric resonator antennas for ultra-wide band applications","authors":"L. Gabrielli, L. P. de Oliveira, G. N. Malheiros-Silveira, J. Pita, H. Hernández-Figueroa","doi":"10.1109/IMOC.2017.8121161","DOIUrl":"https://doi.org/10.1109/IMOC.2017.8121161","url":null,"abstract":"We present our latest advances in antenna miniaturization using dielectric resonators and design of sparse arrays for ultra-wide band applications without the need for non-linear numerical optimization. We experimentally demonstrate a dual-feed, low-profile, stacked dielectric resonator antenna for the C band with wide bandwidth and high gain, as well as a bio-inspired sparse array design for ultra-wide band applications. We show that the results presented can be successfully extended to other frequency windows, in particular the near-infrared range, where specific issues prevent the use of more conventional antenna and antenna array designs.","PeriodicalId":171284,"journal":{"name":"2017 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127640328","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: 3
Measurements of extremely low frequency waves (1–12 Hz) produced by ionospheric high-frequency waves 电离层高频波产生的极低频波(1-12赫兹)的测量
2017 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC) Pub Date : 2017-08-01 DOI: 10.1109/IMOC.2017.8121089
I. Martin, M. Alves, A. J. de Abreu, M. P. Gomes, L. C. Folgueras
{"title":"Measurements of extremely low frequency waves (1–12 Hz) produced by ionospheric high-frequency waves","authors":"I. Martin, M. Alves, A. J. de Abreu, M. P. Gomes, L. C. Folgueras","doi":"10.1109/IMOC.2017.8121089","DOIUrl":"https://doi.org/10.1109/IMOC.2017.8121089","url":null,"abstract":"In a recent study, a process for the generation of Extremely Low Frequency (ELF) waves in the range of 1–12 Hz produced by diamagnetic currents generated by heat in ionosphere by high frequency (HF) waves has been proposed. HF waves that reach the ionosphere can be generated, for example, on the Earth's surface by the High Frequency Active Auroral Research Program (HAARP) instruments or solar processes. Using a EMF low frequency spectrum analyzer with high sensitivity (1 μΥ) operating in the range of 1–12 Hz and using a low sampling time (5 ms), it was possible to measure HF waves. A series of measurements were carried out in São José dos Campos, Brazil, from September, 2016 to March, 2017, under dry conditions and with the analyzer isolated from electrical discharges to detect and record these waves. The positive results of the experimental observations suggest a possible confirmation of the occurrence of diamagnetic currents in ionosphere.","PeriodicalId":171284,"journal":{"name":"2017 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC)","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126561504","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
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