2019 PhotonIcs & Electromagnetics Research Symposium - Spring (PIERS-Spring)最新文献

{"title":"Bismuth and Bismuth Telluride Thin Films Deposited by MOCVD upon Tapered Fiber Sections as Q-switches for Fiber Lasers","authors":"E. Savelyev, P. I. Kuznetzov, D. Sudas, L. Zakharov, K. Golant","doi":"10.1109/PIERS-Spring46901.2019.9017887","DOIUrl":"https://doi.org/10.1109/PIERS-Spring46901.2019.9017887","url":null,"abstract":"Lasing regimes of ring erbium fiber lasers passively Q-switched by means of fiber tapers coated with thin crystalline films of either Bi2Te3 or Bi as saturable absorbers (SAs) are investigated. 10–15 μm in diameter and 5–10 mm long fiber tapers are prepared by local chemical etching out of a silica light reflecting cladding of the standard SMF-28 optical fiber. Nanometer thick island films of pure Bi and Bi2Te3 are synthesized on the surface of the fiber tapers by applying the metalorganic chemical vapor deposition (MOCVD). The deposited films are then covered with two different polymers: either polyvinyl acetate (PVA) or polydimethylsiloxane elastomer (PDMSE). The fiber section with polymer-coated SA fiber is installed into the ring laser cavity in tandem with the section of an active fiber. For all the samples a stable generation of microsecond pulses in the Q-switch mode at a wavelength of about 1560 nm is observed. To the best of our knowledge, a passively Q-switched fiber laser with nanometer Bi films as a saturable absorber is implemented for the first time. It is established that even a small increase in the temperature of the surrounding medium leads to a significant increase in the transmission coefficient of polymer-coated tapers with deposited SA films, which may be attributed to a decrease in the refractive index of the polymers. The most significant increase in the transmission coefficient with increasing temperature is observed in tapers coated with PVA, which has a refractive index larger than fused silica.","PeriodicalId":446190,"journal":{"name":"2019 PhotonIcs & Electromagnetics Research Symposium - Spring (PIERS-Spring)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115384472","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}

{"title":"Enhancement of Temperature-humidity Retrieval Algorithms of Satellite MW Data Processing","authors":"V. Savorskiy, D. Ermakov, B. Kutuza, A. Chernushich, M. Smirnov, O. Panova, M. Danilychev","doi":"10.1109/PIERS-Spring46901.2019.9017771","DOIUrl":"https://doi.org/10.1109/PIERS-Spring46901.2019.9017771","url":null,"abstract":"Additional a priori and/or supplementary information on the state of the atmosphere potentially improves the efficiency of retrieval algorithms in comparison to the usage of mean climatic statistics of the atmosphere. Exploration and evaluation of the efficiency of the application of such additional information is the main point of this work. To achieve this goal, this work investigates the statistical approach expansion by including new types of a priori information about the temperaturehumidity state of the atmosphere. The developed methodology introduces an efficiency measure that allows the estimation of the efficiency of the following a priori information types for atmospheric profile retrieval from satellite MW data processing: 1) covariance matrices of the full vector temperature-humidity state of the atmosphere along a vertical profile, 2) covariance matrices of atmosphere variations along the atmospheres horizontal layer, and 3) physical limits of humidity profile variations. The results of atmospheric profile retrieval, based on the Levenberg-Marquardt algorithm, confirm the possibility of using this approach to restore atmospheric parameters in real time, i.e. for times shorter than the correlation intervals in the atmosphere.","PeriodicalId":446190,"journal":{"name":"2019 PhotonIcs & Electromagnetics Research Symposium - Spring (PIERS-Spring)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115647915","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}

{"title":"Investigation of Optical Signal Regeneration Impact on Power Efficiency of Single-line-rate and Mixed-line-rate Wavelength Division Multiplexing Systems","authors":"D. Pavlovs, V. Bobrovs, K. Vilcāne, G. Ivanovs","doi":"10.1109/PIERS-Spring46901.2019.9017644","DOIUrl":"https://doi.org/10.1109/PIERS-Spring46901.2019.9017644","url":null,"abstract":"The requirements for such conflicting parameters as signal transmission speed and quality of transmission continuously increasing on the grounds growing demands of bandwidth-intensive applications like high quality multimedia, extremely detailed, multi-player online gaming and highly capacitive data storage and exchanges. Simultaneous increment of both parameters always leads to power consumption growing, mostly defined by signal regeneration activities, which in its turn stays in contradiction with green network methods. In addition, by existence of the spectral band limitations appropriate for data transmission, the initial system settings and requirements changes from one network to another and can be fulfilled by different network designs with different power efficiency levels. The Wavelength Division Multiplexing (WDM) systems had been developed with the aim to increase information transmission speeds, where the transmission speed of single channel and channel spacing becomes the defining factors for the overall system's capacity. Nevertheless, on the grounds of cross-channel interference, sub-band spacing reduction and usage of high-capacitive signals can adversely affect the system's transmission reach, which will lead to the more frequent signal regeneration. Therefore, the trade-off between transmission speed, quality of transmission and power consumption must be evaluated. In this work authors compare the Single-Line-Rate (SLR) and Multi-Line-Rate (MLR) WDM systems, which uses the most common transmission signals, to demonstrate relation between the enchased spectral efficiency and its impact on the relevant systems power consumption by means of power efficiency and evaluation of 3Rs' (re-amplification, retiming, reshaping) power ratio. The power efficiency was manipulated by different channel spacing. The results are presented as functions of transmitted information volume, which allows adapting the results for transmission systems with different available spectral band.","PeriodicalId":446190,"journal":{"name":"2019 PhotonIcs & Electromagnetics Research Symposium - Spring (PIERS-Spring)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123086152","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}

{"title":"The Dynamic Range Maximisation of Shielding Effectiveness Measurements","authors":"L. Nowosielski, M. Wnuk, Joanna Kuźba","doi":"10.1109/PIERS-Spring46901.2019.9017739","DOIUrl":"https://doi.org/10.1109/PIERS-Spring46901.2019.9017739","url":null,"abstract":"The article concerns problems connected with measuring shielding effectiveness of small shielded chambers. In the article the measuring procedure and the position for measuring shielding effectiveness of small shielded chambers have been described. The described method uses a selective measuring receiver and signal generator. Particular attention was paid to maximization of dynamics range in measuring shielding effectiveness of shielded chambers through minimization of noise level in measuring receiver obtained as a result of narrowing the RBW filter of intermediate frequency, through averaging the received noised test signal and through increasing the level of probing signal.","PeriodicalId":446190,"journal":{"name":"2019 PhotonIcs & Electromagnetics Research Symposium - Spring (PIERS-Spring)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124254217","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}

{"title":"Performance Estimate of Range Profile Feature Extraction for the Case of Defined Viewing Aspect by Means of Fisher Score","authors":"F. .. Baulin, E. V. Buryi","doi":"10.1109/PIERS-Spring46901.2019.9017824","DOIUrl":"https://doi.org/10.1109/PIERS-Spring46901.2019.9017824","url":null,"abstract":"In this article performance estimation technique of range profile feature extraction is described. This technique is suitable for the cases when range profiles are acquired with an a priori knowledge of viewing aspect of an object. The feature extraction performance is estimated by separability of feature vector sets provided by the procedure of extraction. It is shown that in case of know viewing aspect, Fisher score could be used as a measure of separability. Comparison of Fourier transform based and wavelet transform based feature extractions is provided. Provided modelling results shows relation between Fisher score-based estimate of separability and AUC ROC classification performance estimate.","PeriodicalId":446190,"journal":{"name":"2019 PhotonIcs & Electromagnetics Research Symposium - Spring (PIERS-Spring)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116605171","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}

{"title":"High Power Terahertz Source Based on Planar Antenna Integrated Vacuum Photodiode","authors":"Jun Dai, C. Ruan, Yikun Ding, Xingyun Zhang","doi":"10.1109/PIERS-Spring46901.2019.9017858","DOIUrl":"https://doi.org/10.1109/PIERS-Spring46901.2019.9017858","url":null,"abstract":"Technologies and industrials in imaging, security detection, and spectroscopy applications are still in great need of much higher output power THz source. In this paper, a new fiber-coupled THz photomixer based on a THz vacuum photodiode with an integrated broadband antenna is proposed and designed to produce high-power terahertz wave. Compared with the low-temperature-grown (LTG) III-V material-based photomixer, and UTC-PD-based photomixer, the proposed photomixer could transport high-density carriers (only electrons) using a vacuum channel, and the carrier mobility is further improved. This paper also demonstrates the integrated antenna design and antenna radiation pattern. The antenna return loss is optimized below −10 dB for a wide bandwidth which is suitable for the photomixer tuning range.","PeriodicalId":446190,"journal":{"name":"2019 PhotonIcs & Electromagnetics Research Symposium - Spring (PIERS-Spring)","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116770580","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}

{"title":"Non-contact Pulse-based Radar with an Excited RF Pulse Generator for Vital-sign Application","authors":"Wei-Hsien Chen, Chia-Hung Chang, C. Kuo, Chia-Chin Hsu","doi":"10.1109/PIERS-Spring46901.2019.9017738","DOIUrl":"https://doi.org/10.1109/PIERS-Spring46901.2019.9017738","url":null,"abstract":"This paper presents a pulse-based investigation to generate a serial of sensing pulses for probing the reciprocal movements of heartbeat and chest, respectively. An excited self-contained RF pulse generator with digital assisted controller is used for pulse shaping and performing nanosecond sensing pulses. In addition, the generator is implemented by a common source field-controlled transistor and a contour circuit by micro-strip line. Hence, in this paper, probing pulses and receives the echoes from the investigated subject back and forth by the whole sensing radar based on the monostatic antenna system. The demodulator is utilized to perform the multiplication of the reference probing waves and the return echoes delayed by the time interval between the emitted signal and reflected waves back to the radar module. The following analog baseband processing circuits with 3-stage topology for further amplifying and filtering the received physiological information help to increase the overall signal-to-noise ratio (SNR). The measured results demonstrate that the radiated RF pulses and vital signs are expected.","PeriodicalId":446190,"journal":{"name":"2019 PhotonIcs & Electromagnetics Research Symposium - Spring (PIERS-Spring)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117155517","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}

{"title":"Real-Time Operating UWB Sensor System for Static Person Localization","authors":"M. Švecová, T. Porteleky, D. Kocur","doi":"10.1109/PIERS-Spring46901.2019.9017903","DOIUrl":"https://doi.org/10.1109/PIERS-Spring46901.2019.9017903","url":null,"abstract":"During the last decade, great attention has been devoted to static person (SP) localization by ultra-wideband (UWB) sensors. A number of promising applications of UWB sensors such as technological support at security operation and disaster events, or within ambient assisted living programs and biometric radars applied for a human being vital sign monitoring has been the most important motivation attracting the great interest of the researchers and high-tech companies. The state-of-the-art in this field has indicated, that the basic principles of SP localization by UWB sensors can be considered solved at the present time. On the other hand, the real-life scenarios are still bringing new, unsolved and challenging problems. In order to provide this technology to final users for everyday applications, these practical problems have to be identified and then solved. For their revealing, a real-time performing UWB sensor system testbed to be applied for SP localization (UWB - SP-LS) could be very useful experimental apparatus. It could be applied for the first experimental measurements for the considered applications. Then, the analyses of the measurement results can identify a new unexpected and/or unsolved problem and then define additional requirements for the development of final solutions. Motivated by these findings, we decided to develop such UWB - SP-LS at the Technical University of Košice. In this paper, we will describe shortly a basic concept of its hardware and software structure, and signal processing methods employed for SP localization. The UWB - SP-LS performance we will illustrate by some experimental results obtained for line-of-sight localization of two SPs.","PeriodicalId":446190,"journal":{"name":"2019 PhotonIcs & Electromagnetics Research Symposium - Spring (PIERS-Spring)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121002043","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}

{"title":"Defect Detection of Metal Pipeline Based on Harmonic Eddy Current","authors":"Yizhen Zhao, Xinhua Wang, Yingchun Chen, Haiyang Ju, Tao Zhang, Z. Ullah","doi":"10.1109/PIERS-Spring46901.2019.9017755","DOIUrl":"https://doi.org/10.1109/PIERS-Spring46901.2019.9017755","url":null,"abstract":"Harmonic eddy current testing (HECT) is an electromagnetic non-destructive testing method, which can realize non-contact detection of metal pipeline defects. Eddy current will be produced at the metal pipeline affected by harmonic excitation with multiple frequencies. Meanwhile, the eddy current generated would be uneven due to the disturbance of the defects. In order to detect the abnormalities effectively, the relationship model among the diameter of the pipeline the lift-off height of the probe and the angle of excitation coils was established within this paper. The effect of the magnetic field focusing using different excitation coils models were studied by finite element simulation and the optimal structure of the harmonic excitation coils model was finally achieved. The experimental platform was established, and three types of defects were designed on the top and left side of the pipeline, including circular holes, rectangular grooves, and 45-degree rectangular grooves. The harmonic eddy current magnetic field signals were acquired by the 3-axis Tunnel Magneto-Resistance (TMR) sensors array. The frequency bands of interference and original excitation signal were removed by using Multi-Resolution Analysis (MRA), and thus, the useful signal frequency bands were selected for fusion. The fused signals were input into the bistable Stochastic Resonance (SR) system to realize the noise energy transfer, which was analyzed by the fourth-order Runge-Kutta algorithm and the scale transformation, so as to enhance the energy of the signals at the pipeline defects. The results show that the designed harmonic excitation coils model improves the excitation effect of both sides of the pipeline and expands the coverage of the flaw detection of the pipeline. Besides, the signal processing method proposed within this paper can extract the pipeline defects signal effectively and improve the ability of defects identification. The above research can be helpful on the non-contact non-destructive testing of metallic materials.","PeriodicalId":446190,"journal":{"name":"2019 PhotonIcs & Electromagnetics Research Symposium - Spring (PIERS-Spring)","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127223884","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}

{"title":"Nematic Liquid Crystal Waveguides for Spatial Control of Linearly Polarized Light Waves","authors":"V. S. Kabanava, I. Rushnova, E. Melnikova, A. Tolstik","doi":"10.1109/PIERS-Spring46901.2019.9017592","DOIUrl":"https://doi.org/10.1109/PIERS-Spring46901.2019.9017592","url":null,"abstract":"Electrically switchable liquid crystal (LC) waveguide structures for spatial-polarization control of light waves become more and more widespread as optical components for waveguide photonics. The motivation of the work was to design and fabricate miniaturized, low-cost electrically switchable LC waveguides for spatial control of linearly polarized light beams. With the use of new configurations of the spatially modulated electric field applied to planar-aligned sandwich-type LC cells $(d=20mu mathrm{m}$ thick), the polarization-sensitive waveguide structures performing the functions of optical splitter and adder were designed and experimentally studied. The current-conducting glass substrates coated with patterned electrodes (splitter-shaped and adder-shaped chromium layers) were used to control the optical properties of LC waveguides by applying an external low-frequency (1 kHz) electrical voltage to the LC cell electrodes. The operation principle of the fabricated optical components is based on the effect of total internal reflection (TIR) of laser radiation from the electrically controlled refractive interface between LC areas with orthogonal director orientations. Optical components of this type look promising for the production of competitive low power consumption photonic devices with enhanced functional characteristics.","PeriodicalId":446190,"journal":{"name":"2019 PhotonIcs & Electromagnetics Research Symposium - Spring (PIERS-Spring)","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125050582","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}