Bibliographies thématiques / LEAKY CHANNEL WAVEGUIDE

Littérature scientifique sur le sujet « LEAKY CHANNEL WAVEGUIDE »

Auteur : Grafiati
Publié le 11 septembre 2023

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Articles de revues sur le sujet "LEAKY CHANNEL WAVEGUIDE"

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Qiu, Chencheng, Liu Liu, Botao Han, Jiachi Zhang, Zheng Li et Tao Zhou. « Broadband Wireless Communication Systems for Vacuum Tube High-Speed Flying Train ». Applied Sciences 10, no 4 (18 février 2020) : 1379. http://dx.doi.org/10.3390/app10041379.

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A vactrain (or vacuum tube high-speed flying train) is considered as a novel proposed rail transportation approach in the ultra-high-speed scenario. The maglev train can run with low mechanical friction, low air resistance, and low noise mode at a speed exceeding 1000 km/h inside the vacuum tube regardless of weather conditions. Currently, there is no research on train-to-ground wireless communication system for vactrain. In this paper, we first summarize a list of the unique challenges and opportunities associated with the wireless communication for vactrain, then analyze the bandwidth and Quality of Service (QoS) requirements of vactrain’s train-to-ground communication services quantitatively. To address these challenges and utilize the unique opportunities, a leaky waveguide solution with simple architecture but excellent performance is proposed for wireless coverage for vactrains. The simulation of the leaky waveguide is conducted, and the results show the uniform phase distribution along the horizontal direction of the tube, but also the smooth field distribution at the point far away from the leaky waveguide, which can suppress Doppler frequency shift, indicating that the time-varying frequency-selective fading channel could be approximated as a stationary channel. Furthermore, the train-to-ground wireless access architectures based on leaky waveguide are studied and analyzed. Finally, the moving scheme is adopted based on centralized, cooperative, cloud Radio Access Network (C-RAN), so as to deal with the extremely frequent handoff issue.
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Maims, Chris, John Hulme, Peter R. Fielden et Nicholas J. Goddard. « Grating coupled leaky waveguide micro channel sensor chips for optical analysis ». Sensors and Actuators B : Chemical 77, no 3 (juillet 2001) : 671–78. http://dx.doi.org/10.1016/s0925-4005(01)00773-0.

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Rohde, Charles A., et Christina J. Naify. « Detecting acoustic chirality with matched metamaterial vortex wave antennas ». Journal of the Acoustical Society of America 154, no 2 (1 août 2023) : 721–29. http://dx.doi.org/10.1121/10.0020533.

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ABSTRACT Acoustic communications often have limited data rates because of the intrinsically low frequencies. Exploring new spatial modes to increase data bandwidth at fixed frequency is a possible solution to this problem. Here, we demonstrate acoustic wave chirality transmission between two reciprocal metamaterial vortex wave antennas, generating and sensing transmitted acoustic wave chirality through the sub-wavelength geometry of the system. By adding an acoustic leaky wave surface to a ring resonator waveguide, acoustic vortex waves with positive or negative integer mode chirality are independently radiated and detected using a small number of microphones. Through computational simulation and experimental verification, using three-dimensional printed waveguides, we show that the vortex mode chirality can be transferred between two opposing acoustic vortex wave antennas across a small unguided air gap. We also show that emission into an external waveguide can provide long distance data transmission. This demonstrates the first use of metamaterial vortex wave antennas as chiral, mode multi-channel data transceivers.
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Wang, Hongwei, F. Richard Yu, Li Zhu, Tao Tang et Bin Ning. « Modeling of Communication-Based Train Control (CBTC) Radio Channel With Leaky Waveguide ». IEEE Antennas and Wireless Propagation Letters 12 (2013) : 1061–64. http://dx.doi.org/10.1109/lawp.2013.2279847.

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Kumar, A., V. Rastogi et K. S. Chiang. « Large-core single-mode channel waveguide based on geometrically shaped leaky cladding ». Applied Physics B 90, no 3-4 (19 janvier 2008) : 507–12. http://dx.doi.org/10.1007/s00340-007-2904-3.

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Malins, Chris, John Hulme, Peter R. Fielden et Nicholas J. Goddard. « Erratum to “Grating coupled leaky waveguide micro channel sensor chips for optical analysis” ». Sensors and Actuators B : Chemical 79, no 1 (septembre 2001) : 85. http://dx.doi.org/10.1016/s0925-4005(01)00900-5.

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Saleem, Asad, Min Wang, Guoxin Zheng et Xiaoyu Yin. « Spatial Characteristics of Wideband Channels Using Leaky Coaxial Cables in Tunnel Scenario ». International Journal of Antennas and Propagation 2019 (2 mai 2019) : 1–10. http://dx.doi.org/10.1155/2019/9374905.

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This paper presents the spatial domain and propagation characteristics of different wideband channels using leaky coaxial cables (LCXs) for underground environment at 1.8GHz corresponding to the Long Term Evolution for Metro (LTE-M) standards. Angular dispersion of the signal significantly affects the channel capacity, and it can be exactly predicted in both the near and far fields for underground environments by means of a multimode waveguide. A ray tracing phenomenon was exploited to visualize the wave propagation for different transmitter and receiver antenna distances by using the time domain approach for both the horizontally and vertically polarized LCXs. In order to achieve this goal, we characterized the power azimuth spectrum (PAS) and power angle profile (PAP) for different tunnel dimensions and found that the PAS can be demonstrated by a zero-mean Gaussian distribution whose angular spread (AS) is dependent on the transmitter-receiver distances and the tunnel dimensions. The results demonstrate that the horizontally polarized LCX has higher angular spread values than the vertically polarized one, and the correlation coefficient follows the decreasing function with the increment of angular spread.
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Zhang, Jiachi, Liu Liu, Botao Han, Zheng Li, Tao Zhou, Kai Wang, Dong Wang et Bo Ai. « Concepts on Train-to-Ground Wireless Communication System for Hyperloop : Channel, Network Architecture, and Resource Management ». Energies 13, no 17 (20 août 2020) : 4309. http://dx.doi.org/10.3390/en13174309.

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Hyperloop is envisioned as a novel transportation way with merits of ultra-high velocity and great traveling comforts. In this paper, we present some concepts on the key technologies dedicated to the train-to-ground communication system based on some prevailing fifth-generation communication (5G) technologies from three aspects: wireless channel, network architecture, and resource management. First, we characterize the wireless channel of the distributed antenna system (DAS) using the propagation-graph channel modelling theory. Simulation reveals that a drastic Doppler shift variation appears when crossing the trackside antenna. Hence, the leaky waveguide system is a promising way to provide a stable receiving signal. In this regard, the radio coverage is briefly estimated. Second, a cloud architecture is utilized to integrate several successive trackside leaky waveguides into a logical cell to reduce the handover frequency. Moreover, based on a many-to-many mapping relationship between distributed units (DUs) and centralized units (CUs), a novel access network architecture is proposed to reduce the inevitable handover cost by using the graph theory. Simulation results show that this scheme can yield a low handover cost. Then, with regards to the ultra-reliable and low latency communication (uRLLC) traffic, a physical resource block (PRB) multiplexing scheme considering the latency requirements of each traffic type is exploited. Simulation presents that this scheme can maximize the throughput of non-critical mission communication services while guaranteeing the requirements of uRLLC traffic. Finally, in terms of the non-critical mission communication services, two cache-based resource management strategies are proposed to boost the throughput and reduce the midhaul link burden by pre-fetching and post-uploading schemes. Simulation demonstrates that the cache-based schemes can boost the throughput dramatically.
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Torabi, Yalda, Gholamreza Dadashzadeh, Milad Hadeie, Homayoon Oraizi et Ali Lalbakhsh. « A Wide-Angle Scanning Sub-Terahertz Leaky-Wave Antenna Based on a Multilayer Dielectric Image Waveguide ». Electronics 10, no 17 (6 septembre 2021) : 2172. http://dx.doi.org/10.3390/electronics10172172.

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This paper presents a new layered dielectric leaky-wave antenna (LWA) for the sub-terahertz (THz) frequency range capable of efficient operation at the broadside with a wide beam scanning angle and stable gain. It consists of a conductor-backed alumina dielectric image line (DIL) with two different dielectric layers mounted on top of each other for performance improvement. The upper layer is a high permittivity RO6010 substrate to enhance the directivity as a superstrate and the lower layer is a low-permittivity RT/duroid 5880 substrate stacked on the alumina DIL to prevent the probable excitation of higher-order modes in the DIL channel. A 15-element linear array of radiating overlapped discs is used to mitigate the open stop-band (OSB) problem, fed by the mentioned waveguide, was designed and simulated at frequencies around 170 GHz. The dominant mode of the layered dielectric waveguide is perturbed by the infinite space harmonics generated by two sets of overlapped discs periodically sandwiched between the layers. It exhibited a relatively wide impedance bandwidth of 28.19% (157.5–206 GHz). Its radiation mechanism has been widely studied through simulations. The results revealed that the antenna provides a wide scanning capability through the broadside from −23° to 38°, covering the frequency range between 157.5 GHz and 201.5 GHz. For an array with 15 radiating elements, the simulated peak gain in the band is 15 dBi and the broadside gain is 13.6 dBi at 172 GHz.
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URANUS, H. P., H. J. W. M. HOEKSTRA et E. VAN GROESEN. « GALERKIN FINITE ELEMENT SCHEME WITH BAYLISS–GUNZBURGER–TURKEL-LIKE BOUNDARY CONDITIONS FOR VECTORIAL OPTICAL MODE SOLVER ». Journal of Nonlinear Optical Physics & ; Materials 13, no 02 (juin 2004) : 175–94. http://dx.doi.org/10.1142/s0218863504001840.

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A Galerkin finite element scheme furnished with 1st-order Bayliss–Gunzburger–Turkel-like boundary conditions is formulated to compute both the guided and leaky modes of anisotropic channel waveguides of non-magnetic materials with diagonal permittivity tensor. The scheme is formulated using transverse components of magnetic fields for nodal-based quadratic triangular elements. Results for some structures will be presented. The effectiveness of the boundary conditions will be illustrated using a step-index optical fiber with computational boundaries positioned near to the core, and the leaky modes computation of a leaky rib structure. In addition, a leaky mode solving of a six-hole "photonic crystal fiber" will be demonstrated. The computed results agree with their exact values (for optical fibers) and published results (for other structures).
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Thèses sur le sujet "LEAKY CHANNEL WAVEGUIDE"

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SRIVASTAVA, KISLAY. « DESIGN AND ANALYSIS OF DUAL SHAPE CORE LARGE-MODE-AREA LEAKY CHANNEL WAVEGUIDE FOR HIGH POWER ». Thesis, 2016. http://dspace.dtu.ac.in:8080/jspui/handle/repository/14454.

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We propose a leaky channel waveguide for large-mode-area extended single-mode operation. The proposed structure is characterized by specially designed guiding core and multilayer cladding. Specially designed cladding enables all the supported modes except fundamental modes leaky. Leakage loss of the higher-order mode which is key factor of single-mode operation is calculated by solving the profile by effective index method in conjunction with transfer matrix method. Dispersive cladding of the proposed design makes this design enable to show extended single mode operation in the entire wavelength range beyond 900 nm with a mode area as large as 100μm2. Such a large confinement area for mode propagation can effectively suppress non linear optical effects. The waveguide is expected to find application in the design of high power lasers and amplifiers.
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SINGH, SANDEEP. « DESIGN AND ANALYSIS OF TRENCH ASSISTED LARGE MODE AREA LEAKY CHANNEL WAVEGUIDE FOR HIGH-POWER APPLICATIONS ». Thesis, 2013. http://dspace.dtu.ac.in:8080/jspui/handle/repository/15673.

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Integrated-optic waveguide lasers have drawn considerable attention for their compactness and possibility of device integration. A lot of interest has been shown to increase the mode area of waveguide for applications in optical communication and high-power laser and amplifier. For waveguide laser and amplifier applications, it is preferable to use a waveguide that supports only one mode to avoid instability arising from intermodal dispersion and mode competition. A conventional single-mode waveguide has a small guiding core. The tight light confinement in such a waveguide can reduce the optical damage threshold of the waveguide and at the same time, give rise to significant nonlinear optical effects, which limit ultimately the power handling capability of the waveguide. A preferred structure for high-power applications should be one that has a large core and yet supports only a single mode. Here a novel cladding design in which the refractive index is uniform but the geometry is so designed that all the modes are leaky. Such a geometrically shaped cladding is highly dispersive and can also lead to singlemode operation over an extended range of wavelengths. Using properly chosen parameters, the waveguide can exhibit single-mode operation in the wavelength range 900–1600nm with a large core area.
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Chapitres de livres sur le sujet "LEAKY CHANNEL WAVEGUIDE"

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Wang, Hongwei, F. Yu, Li Zhu et Tao Tang. « Modeling of the Wireless Channels with Leaky Waveguide for Communications-Based Train Control Systems ». Dans Advances in Communications-Based Train Control Systems, 81–91. CRC Press, 2015. http://dx.doi.org/10.1201/b19389-6.

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Actes de conférences sur le sujet "LEAKY CHANNEL WAVEGUIDE"

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Lynch, J., C. G. Durfee et H. M. Milchberg. « Leaky Mode Propagation in a High Intensity Plasma Waveguide ». Dans High Resolution Fourier Transform Spectroscopy. Washington, D.C. : Optica Publishing Group, 1994. http://dx.doi.org/10.1364/hrfts.1994.wc5.

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The finite thickness of the electron density barrier in the shock driven plasma waveguide1 (see Fig. 1 of paper Mode Properties of a High Intensity Plasma Waveguide, this conference) implies that formally, there are no bound modes (ie. no discrete spectrum of channel propagation wavenumbers) since all fields leak to some extent. For sufficiently large ΔNe and rm (where ΔNe = Ne(rm)-Ne(0) is the electron density difference between the peak and on-axis electron density and rm is the radius to the electron density peak), low order leaky waveforms are effectively indistinguishable from eigenmodes of a channel having Ne(r)= Nemax for r>rm (idealized channel). As an example of this, Fig. 1 compares leaky waveforms from a model channel (consistent with predictions of our laser-plasma hydrodynamics code1) to eigenmodes of the corresponding idealized channel. In this case, the field attenuation in the walls is sufficient to result in little tunneling or leakage of the lowest order p=0, m=0 mode (where p and m are radial and azimuthal mode indices). The p=1, m=0 mode, however, is sensitive to the finite barrier thickness in this case.
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Saini, Than Singh, Ajeet Kumar, Vipul Rastogi et Ravindra Kumar Sinha. « Leaky channel waveguide for large-mode-area extended single-mode operation ». Dans PROCEEDING OF INTERNATIONAL CONFERENCE ON RECENT TRENDS IN APPLIED PHYSICS AND MATERIAL SCIENCE : RAM 2013. AIP, 2013. http://dx.doi.org/10.1063/1.4810672.

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Nagaraju, Dovari, Bivin G. Mathew et Yogesh K. Verma. « A Short Channel Waveguide Stub-Loaded Leaky-Wave Antenna at Ku-Band ». Dans 2021 15th European Conference on Antennas and Propagation (EuCAP). IEEE, 2021. http://dx.doi.org/10.23919/eucap51087.2021.9411254.

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Dahiya, Vinita, Than S. Saini, Ajeet Kumar, Vipul Rastogi et Ravindra K. Sinha. « Large-core single-mode trench assisted leaky channel waveguide for high-power applications ». Dans SPIE Optical Engineering + Applications, sous la direction de Shizhuo Yin et Ruyan Guo. SPIE, 2013. http://dx.doi.org/10.1117/12.2023466.

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Pandey, Himanshu, Than Singh Saini et Ajeet Kumar. « Design and analysis of trench-assisted leaky channel waveguide for high power applications ». Dans INTERNATIONAL CONFERENCE ON CONDENSED MATTER AND APPLIED PHYSICS (ICC 2015) : Proceeding of International Conference on Condensed Matter and Applied Physics. Author(s), 2016. http://dx.doi.org/10.1063/1.4946427.

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Durfee, C. G., J. Lynch et H. M. Milchberg. « Mode Properties of a High Intensity Plasma Waveguide ». Dans High Resolution Fourier Transform Spectroscopy. Washington, D.C. : Optica Publishing Group, 1994. http://dx.doi.org/10.1364/hrfts.1994.wa1.

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Recently, we demonstrated a technique for optically guiding intense laser pulses, in which a plasma refractive index channel was produced through the hydrodynamic evolution of a laser breakdown spark in an ambient gas1. Here, we present measurements and calculations showing that our plasma light pipe can support, at high intensity, distinct electromagnetic mode propagation, as well as "leaky mode" propagation. As a reminder of the plasma dynamics involved, Fig. 1 shows a calculation of the response of 30 torr Xe to a pulse of peak intensity I=7x1013 W/cm2, spot size r0=1 μm, and duration τp=100 ps, pulse conditions typical of the ≲ 1 cm long axicon focus of our experiment1. Results from 2.2 cm long channels will be presented in a future paper. It is seen that a shock forms after some delay, after which an electron density minimum develops on axis.
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Normandin, R., H. Dai, S. Janz, A. Delage, J. Brown et F. Chatenoud. « Multilayer, Nonlinear Arrow Waveguides for Surface Emitted Sum-Frequency Mixing ». Dans Nonlinear Optics. Washington, D.C. : Optica Publishing Group, 1992. http://dx.doi.org/10.1364/nlo.1992.pd12.

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When used with conventional communication optical fibers, with a typical core diameter of 8µm, conventional channel waveguides geometries need to present similar thicknesses for good mode overlaps between the two. This has been a difficult goal to achieve with semiconductor waveguides due to their high index of refraction. The waveguides were typically much thinner than the fiber core and, consequently, input efficiencies were quite low. This problem was addressed some time ago with the demonstration of the antiresonant reflecting waveguide (ARROW) geometry(1). Although these are intrinsically leaky waveguides quite acceptable losses were feasible in silicon(2) and GaAs(3) geometries. On the other hand when dealing with nonlinear interactions in semiconductor waveguides, it was realised quickly that in other to maintain acceptable overall efficiencies the waveguide thickness had to be kept unreasonably small (4). This obviously led to input coupling difficulties. In our previous work, presented two years ago at this topical meeting (5), we demonstrated a new multilayer AIGaAs waveguide geometry with surface harmonic emission efficiencies well above what was possible in uniform films. This led to the development of several devices (6,7) such as correlators, spectrometers and intracavity diode laser second harmonic generators(8). However, little attention has been given to the problem of fiber input coupling to the nonlinear waveguide. We present the first results, to our knowledge, of multi-layer core ARROW waveguides and their use in nonlinear harmonic generation. There has been little mention of the ARROW geometry in a nonlinear context, with the recent exception of inter-guide coupling(9), since they tend to be thick guiding structures.
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Valera, J. D., D. J. Goodwill et A. C. Walker. « Nonlinear Optical Switching in GaAlAs Waveguides ». Dans Nonlinear Guided-Wave Phenomena. Washington, D.C. : Optica Publishing Group, 1989. http://dx.doi.org/10.1364/nlgwp.1989.thb5.

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Previously reported observations of optical bistability in a GaAs/GaAlAs waveguide cavity included whole-sample thermally induced absorptive and refractive bistability [1] and localised (μs) thermally induced absorptive bistability [2]. Other groups have observed refractive bistability due to an optoelectronic mechanism in MQW GaAs/GaAlAs waveguides [3,4]. In this paper we report the observation of bistability due to thermally induced changes in leaky modes within a GaAs/GaAlAs waveguide and discuss the optimisation of optoelectronic nonlinearities in semiconductor guides of this type. A leaky planar waveguide consists of a low index layer bounded by two higher index layers. These exhibit radiative losses, where for the nth order mode the attenuation coefficient is proportional to (n+1)2 [5]. In this investigation the waveguides used were short enough to allow good transmission of the lower order modes.
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Hadley, G. Ronald. « Understanding leaky-mode arrays via 2-D coupled mode theory ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1989. http://dx.doi.org/10.1364/oam.1989.maa5.

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The first insights into index-guided diode laser array behavior were provided by using the effective index method to solve for the modes of the individual waveguides and coupled-mode theory to describe how these mix to form the array modes. Although this procedure has been fruitful for the study of conventional arrays, new devices now being fabricated employ large index steps for defining the channels, and thus are not amenable to the effective index approximation. Even worse, the modes of these devices, when calculated numerically, are very complex. This fact, together with the enormous parameter space resulting from the many possible shapes and spacings of the buried ridges, lead to serious difficulties in mode categorization and device design. Sidestepping the effective index approximation, we use coupledmode theory directly by considering the active region and the buried ridges as separate 2-D waveguides. The device modes are then expressed as linear combinations of these waveguide modes. This picture serves to unify our understanding of index-guided arrays in general, and offers a means of understanding leaky-mode array operation in particular by dramatically reducing the parameter space to consist only of the propagation constants of the lowest-order waveguide modes and their coupling coefficient.
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Valera, J. D., J. S. Aitchison, D. J. Goodwill, A. C. Walker, I. D. Henning et S. Ritchie. « Modal Bistability in a GaAlAs Leaky Waveguide ». Dans Optical Bistability. Washington, D.C. : Optica Publishing Group, 1988. http://dx.doi.org/10.1364/obi.1988.wd.2.

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Intrinsic optical bistability has been observed in a waveguide due to both optothermal [1] and optoelectronic [2,3] nonlinearities. In this paper we describe a bistable switching effect associated with mode distribution changes in a nonlinear leaky waveguide. The guide consisted of a Ga0.86Al0.14As layer, 3.6 μm thick and 200 μm, long bounded by GaAs and Ga0.9Al0.1As layers.
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