Szukana fraza: [Słowa kluczowe = "perturbed system"]

Dynamic Contraction Method approach to digital longitudinal aircraft flight controller design

Roman Czyba Lukasz Stajer

Archives of Control Sciences | 2019 | vol. 29 | No 1 | 97-109 | DOI: 10.24425/acs.2019.127525

Słowa kluczowe nonlinear systems MIMO systems aircraft control digital controller singular perturbation

Abstrakt

This paper presents the design of digital controller for longitudinal aircraft model based on the Dynamic Contraction Method. The control task is formulated as a tracking problem of velocity and flight path angle, where decoupled output transients are accomplished in spite of incomplete information about varying parameters of the system and external disturbances. The design of digital controller based on the pseudo-continuous approach is presented, where the digital controller is the result of continuous-time controller discretization. A resulting output feedback controller has a simple form of a combination of low-order linear dynamical systems and a matrix whose entries depend nonlinearly on certain known process variables. Simulation results for an aircraft model confirm theoretical expectations.

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Autorzy i Afiliacje

Roman Czyba

Lukasz Stajer

Growth Law for Columnar Structure within the Copper and Copper Alloys Solidifying at a High Peclet Number

P. Kwapisiński W. Wołczyński

Archives of Metallurgy and Materials | 2023 | vol. 68 | No 2 | 579-584 | DOI: 10.24425/amm.2023.142437

Słowa kluczowe Continuously cast copper ingots Perturbation wavelength Criterion of marginal stability

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Abstrakt

The copper and copper alloys’ ingots have been subjected to structural observation in order to estimate the Peclet Number at which these ingots were solidifying. It was stated that the formation of columnar structure within the ingots occurred at a high Peclet Number, higher than the threshold value of this parameter, Pe = 500. The formulated relationships of the Growth Law correspond to a high Peclet Number due to application of the adequate development in series of the Ivantsov’s function. The Growth Law has been developed on the basis of the definition of the wavelength of perturbation which leads to the dispersion of the planar s/l interface. New definition of the index of stability connected with the behavior of solute concentration at the s/l interface has been delivered. The current definition is related to non-equilibrium solidification. The index can be easily calculated using some parameters delivered by a given Cu-X phase diagram. Physical meaning of the formulated Growth Law has also been presented.

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Autorzy i Afiliacje

P. Kwapisiński

1

e-mail:

ORCID:

W. Wołczyński

2

e-mail:

ORCID:

KGHM Polska Miedź S.A., ul. M. Skłodowskiej-Curie 48, 59-301 Lubin, Polska
Institute of Metallurgy and Materials Sciences PAS, Reymonta St. 25, 30-059 Kraków, Poland

Algorithm for solution of systems of singularly perturbed differential equations with adifferential turning point

Valentyn Sobchuk Iryna Zelenska Oleksandr Laptiev

Bulletin of the Polish Academy of Sciences Technical Sciences | 2023 | 71 | 3 | e145682 | DOI: 10.24425/bpasts.2023.145682

Słowa kluczowe small parametr turning point singular perturbations asymptotics Airy-Langer functions

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Abstrakt

The dynamic development of science requires constant improvement of approaches to modeling physical processes and phenomena. Practically all scientific problems can be described by systems of differential equations. Many scientific problems are described by systems of differential equations of a special class, which belong to the group of so-called singularly perturbed differential equations. Mathematical models of processes described by such differential equations contain a small parameter near the highest derivatives, and it was the presence of this small factor that led to the creation of a large mathematical theory. The work proposes a developed algorithm for constructing uniform asymptotics of solutions to systems of singularly perturbed differential equations.

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Autorzy i Afiliacje

Valentyn Sobchuk

1

e-mail:

ORCID:

Iryna Zelenska

1

e-mail:

ORCID:

Oleksandr Laptiev

1

e-mail:

ORCID:

Taras Shevchenko National University of Kyiv, Ukraine

A robust model free controller for a class of SISO nonaffine nonlinear systems: Application to an electropneumatic actuator

Ahsene Boubakir Salim Labiod Fares Boudjema

Archives of Control Sciences | 2019 | vol. 29 | No 3 | 437–458 | DOI: 10.24425/acs.2019.130200

Słowa kluczowe dynamic inversion control model free controller nonaffine nonlinear systems singular perturbation theory

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Abstrakt

This paper presents a robust model free controller (RMFC) for a class of uncertain continuous-time single-input single-output (SISO) minimum-phase nonaffine-in-control systems. Firstly, the existence of an unknown dynamic inversion controller that can achieve control objectives is demonstrated. Afterwards, a fast approximator is designed to estimate as best as possible this dynamic inversion controller. The proposed robust model free controller is an equivalent realization of the designed fast approximator. The perturbation theory and Tikhonov’s theorem are used to analyze the stability of the overall closed-loop system. The performance of the developped controller are verified experimentally in the position control of a pneumatic actuator system.

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Autorzy i Afiliacje

Ahsene Boubakir

Salim Labiod

Fares Boudjema

Maximum power point tracking techniques for low-cost solar photovoltaic applications – Part II: Mathematical Calculation and Measurement and Comparison, criteria on choices and suitable MPPT techniques

Tole Sutikno Arsyad Cahya Subrata Giovanni Pau Awang Jusoh Kashif Ishaque

Archives of Electrical Engineering | 2023 | vol. 72 | No 2 | 299-322 | DOI: 10.24425/aee.2023.145410

Słowa kluczowe incremental conductance maximum power point tracking measurement and comparison perturb and observe solar photovoltaic (PV) trial-and-error

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Abstrakt

In the last decade, there has been a substantial surge in the advancement of research into the maximum power point tracking (MPPT) controller. The MPPT approaches, on the other hand, continue to be in high demand due to the ease and simplicity with which tracking techniques can be implemented on the maximum power point (MPP). Diverse MPPT approaches and their modifications from various literature are categorized and thoroughly explored in this work, which is divided into two sections. The discussions are centered on the primary goal of attaining the most extraordinary feasible MPPT technique that produces the best results at the lowest possible expense. In order to determine which MPPT approaches to use, evaluations from earlier literature are used to guide the decision. In this section, we will examine the evaluation of the MPPT technique in two sections. Previously, in Part I, we explored the MPPT techniques based on constant parameters and trial-and- error. Part II of this article will examine the MPPT technique, which is based on mathematical computation, measurement, and comparison, and the algorithm development that has occurred in recent years. Furthermore, this section’s assessment for selecting MPPT approaches is based on previous literature reviews. To aid with this selection, the following criteria for the MPPT approach are proposed: sensors and analog/digital requirements, costeffectiveness, simplicity, stability, efficiency, and tracking speed. This enables the reader to select the MPPT technique that is most appropriate for their application.

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Autorzy i Afiliacje

Tole Sutikno

1

e-mail:

ORCID:

Arsyad Cahya Subrata

1

e-mail:

ORCID:

Giovanni Pau

2

e-mail:

ORCID:

Awang Jusoh

3

e-mail:

ORCID:

Kashif Ishaque

4

e-mail:

ORCID:

Department of Electrical Engineering, Universitas Ahmad Dahlan Yogyakarta, Indonesia
Faculty of Engineering and Architecture, Kore University of Enna, Italy
School of Electrical Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, Johor Bahru, Malaysia
Capital University of Science & Technology, Islamabad, Pakistan

Maximum power point tracking techniques for low-cost solar photovoltaic applications – Part I: constant parameters and trial-and-error

Tole Sutikno Arsyad Cahya Subrata Giovanni Pau Awang Jusoh Kashif Ishaque

Archives of Electrical Engineering | 2023 | vol. 72 | No 1 | 125-145 | DOI: 10.24425/aee.2023.143693

Słowa kluczowe incremental conductance maximum power point tracking measurement and comparison perturb and observe solar photovoltaic (PV) trial-and-error

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Abstrakt

The development of research on the maximum power point tracking (MPPT) controller has increased significantly in this decade. The MPPT technique, however, is still demanding because of the ease and simplicity of implementing tracking technique on the maximum power point (MPP). In this paper, MPPT techniques and their modifications from various literature are classified and examined in detail. The discussions are focused on the main objective of obtaining the best possible MPPT technique with the best results at a low cost. The assessment for the selection of MPPT techniques is based on assessments from the previous literature. The discussion of the MPPT technique assessment is divided into two parts. In Part I, the MPPT technique based on constant parameters, and trial-and-error will be discussed in detail, along with its algorithm development in recent times.

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Autorzy i Afiliacje

Tole Sutikno

1

e-mail:

ORCID:

Arsyad Cahya Subrata

1

e-mail:

ORCID:

Giovanni Pau

2

e-mail:

ORCID:

Awang Jusoh

3

e-mail:

ORCID:

Kashif Ishaque

4

e-mail:

ORCID:

Department of Electrical Engineering, Universitas Ahmad Dahlan, Yogyakarta, Indonesia
Faculty of Engineering and Architecture, Kore University of Enna, Italy
School of Electrical Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, Johor Bahru, Malaysia
Capital University of Science and Technology, Islamabad, Pakistan

ℎ-Stability of set differential equations

Sihem Boukthir Boulbaba Ghanmi Imed Basdouri Dalil Ichalal Jean Lerbet

Archives of Control Sciences | 2023 | vol. 33 | No 4 | 761-788 | DOI: 10.24425/acs.2023.148880

Słowa kluczowe ℎ-stability Lyapunov theory set-valued differential generalized Hukuhara derivative perturbed system cascaded systems

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Abstrakt

In this paper, we introduce the notion of h-stability for set-valued differential equations. Necessary and sufficient conditions are established by using Lyapunov theory. Then, based on the obtained results, we study the ℎ-stability of perturbed and cascaded systems. Finally, an example illustrates the proposed theorems

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Autorzy i Afiliacje

Sihem Boukthir

1 2

e-mail:

ORCID:

Boulbaba Ghanmi

3

e-mail:

ORCID:

Imed Basdouri

3

e-mail:

ORCID:

Dalil Ichalal

4

e-mail:

ORCID:

Jean Lerbet

5

Department of Mathematics, Faculty of Sciencesof Sfax, Route Soukra Km 4, BP 802, 3018, Sfax, Tunisia
The IBISC laboratory, University ofEvry Val d’Essonne, University of Paris Saclay University, 40, rue de Pelvoux, 91020, Evry Courcouronnes,France
Department of Mathematics, Faculty of Sciences of Gafsa, Sidi AhmedZarroug, 2112, Gafsa, Tunisia
The IBISC laboratory, University of Evry Vald’Essonne, University of Paris Saclay University, 40, rue de Pelvoux, 91020, Evry Courcouronnes, France
The LaMME laboratory, UMR CNRS 8071, Universityof Evry Val d’Essonne, University of Paris Saclay, 23 Bd de France, 91037, Evry CEDEX, France

Perturbation Element Effect on Frequency Stability in Dual Mode Reconfigurable Filters Based on Circular Microstrip Ring Resonators

Muhammad Haitham Albahnassi Adnan Malki Shokri Almekdad

International Journal of Electronics and Telecommunications | 2019 | vol. 65 | No 4 | 731-737 | DOI: 10.24425/ijet.2019.130256

Słowa kluczowe Dual mode ring resonators dual-mode filters perturbation element arrangement BW reconfigurability

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Abstrakt

A detailed study about the suitable perturbation element shape and location for tunable BW dual mode microstrip filter which has circular ring resonator is presented. BW tuning is achieved by resonator geometry modification. The study explains the effect of a perturbation element on the stability of the center frequency during BW tuning. Different cases have been studied for two shapes of perturbation element; which one is a rectangular and the other is a radial. The treated cases discuss whether the perturbation element is located in the inner or in the outer circumference of the ring, and whether it is a patch or a notch. BW tuning simulation treated the case of FBW3dB increase for two and three times. The best case of perturbation element which has the best center frequency stability has been modeled, simulated, and fabricated at 2.4 GHz. Geometry modification of the filter took into account the RF MEMS modeling. The filter has an elliptic frequency response, and its FBW has been increased in five steps from 1.7% to 5%. The designed filters were evaluated experimentally and by simulation with very good agreement.

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Autorzy i Afiliacje

Muhammad Haitham Albahnassi

Adnan Malki

Shokri Almekdad

Existence, uniqueness and parameter perturbation analysis results of a fractional integro-differential boundary problem

Nan Zhang Lingling Zhang Mercy Ngungu Adejimi Adeniji Emmanuel Addai

Bulletin of the Polish Academy of Sciences Technical Sciences | 2023 | 71 | 4 | e145938 | DOI: 10.24425/bpasts.2023.145938

Słowa kluczowe existence and uniqueness stability analysis parameter perturbation fractional differential equation integro-differential boundary condition

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Abstrakt

In the formulation, the existence, uniqueness and stability of solutions and parameter perturbation analysis to Riemann-Liouville fractional differential equations with integro-differential boundary conditions are discussed by the properties of Green’s function and cone theory. First, some theorems have been established from standard fixed point theorems in a proper Banach space to guarantee the existence and uniqueness of positive solution. Moreover, we discuss the Hyers-Ulam stability and parameter perturbation analysis, which examines the stability of solutions in the presence of small changes in the equation main parameters, that is, the derivative order η, the integral order β of the boundary condition, the boundary parameter ξ , and the boundary value τ. As an application, we present a concrete example to demonstrate the accuracy and usefulness of the proposed work. By using numerical simulation, we obtain the figure of unique solution and change trend figure of the unique solution with small disturbances to occur in different kinds of parameters.

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Autorzy i Afiliacje

Nan Zhang

1

Lingling Zhang

2

e-mail:

ORCID:

Mercy Ngungu

3

Adejimi Adeniji

4

Emmanuel Addai

2

College of Mathematics, Taiyuan University of Technology, 030024, TaiYuan, Shanxi, ChinaCollege of Mathematics, Taiyuan University of Technology, 030024, TaiYuan, Shanxi, China
College of Mathematics, Taiyuan University of Technology, 030024, TaiYuan, Shanxi, China
Human Sciences Research Council (HSRC), South Africa
Tshwane university of Technology, South Africa

Non-fragile event-triggered control of positive switched systems with random nonlinearities and controller perturbations

Yanqi Wu Junfeng Zhang Shizhou Fu

Bulletin of the Polish Academy of Sciences Technical Sciences | 2021 | 69 | 5 | e138566 | DOI: 10.24425/bpasts.2021.138566

Słowa kluczowe positive switched systems non-fragile event-triggered control random nonlinearities random controller perturbations

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Abstrakt

This paper investigates the non-fragile event-triggered control of positive switched systems with random nonlinearities and controller perturbations. The random nonlinearities and controller perturbations are assumed to obey Bernoulli and Binomial sequence, respectively. A class of linear event-triggering conditions is introduced. A switched linear co-positive Lyapunov function is constructed for the systems. For the same probability with respect to nonlinearities and controller perturbations in each subsystem, a non-fragile controller of positive switched systems is designed in terms of linear programming. Then, the different probability case is considered and the corresponding non-fragile event-triggered control is explored. Finally, the effectiveness of theoretical findings is verified via two examples.

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Bibliografia

L. Fainshil, M. Margaliot, and P. Chigansky, “On the stability of positive linear switched systems under arbitrary switching laws,” IEEE Trans. Autom. Contr., vol. 54, no. 4, pp. 897–899, 2009.
T. Kaczorek, “Simple sufficient conditions for asymptotic stability of positive linear systems for any switchings,” Bull. Pol. Acad. Sci. Tech. Sci., vol. 61, no. 2, pp. 343–347, 2013.
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T. Kaczorek, “Global stability of positive standard and fractional nonlinear feedback systems,” Bull. Pol. Acad. Sci. Tech. Sci., vol. 68, no. 2, pp. 285–288, 2020.
H. Yang and Y. Hu, “Stability and stabilization of positive linear dynamical systems: new equivalent conditions and computations,” Bull. Pol. Acad. Sci. Tech. Sci., vol. 68, no. 2, pp. 307‒315, 2020.
L. Farina and S. Rinaldi, Positive linear systems: theory and applications. John Wiley and Sons, 2011.
T. Kaczorek, Positive 1D and 2D systems. Springer Science and Business Media, 2012.
J. Lam et al., Positive Systems. Springer, 2019.
E. Hernandez-Vargas et al., “Discrete-time control for switched positive systems with application to mitigating viral escape,” Int. J. Robust Nonlinear Contr., vol. 21, no. 10, pp. 1093–1111, 2011.
L. Gurvits, R. Shorten, and O. Mason, “On the stability of switched positive linear systems,” IEEE Trans. Autom. Contr., vol. 52, no. 6, pp. 1099–1103, 2007.
E. Fornasini and M. Valcher, “Stability and stabilizability criteria for discrete-time positive switched systems,” IEEE Trans. Autom. Contr., vol. 57, no. 5, pp. 1208‒1221, 2011.
J. Zhang et al., “Stability and stabilization of positive switched systems with mode-dependent average dwell time,” Nonlinear Anal.-Hybrid Syst., vol. 9, pp. 42–55, 2013.
J. Klamka, A. Czornik, and M. Niezabitowski, “Stability and controllability of switched systems,” Bull. Pol. Acad. Sci. Tech. Sci., vol. 61, no. 3, pp. 547–555, 2013.
O. Mason and R. Shorten, “On linear copositive Lyapunov functions and the stability of switched positive linear systems,” IEEE Trans. Autom. Contr., vol. 52, no. 7, pp. 1346–1349, 2007.
F. Blanchini, P. Colaneri, and M. Valcher, “Co-positive Lyapunov functions for the stabilization of positive switched systems,” IEEE Trans. Autom. Contr., vol. 57, no. 12, pp. 3038–3050, 2012.
X. Liu, “Stability analysis of switched positive systems: A switched linear copositive Lyapunov function method,” IEEE Trans. Circuits Syst. II-Express Briefs, vol. 56, no. 5, pp. 414– 418, 2009.
M. Li et al., “Nonfragile reliable control for positive switched systems with actuator faults and saturation,” Optim. Contr. Appl. Met., vol. 40, no. 4, pp. 676–690, 2019.
J. Zhang, X. Zhao, and R. Zhang, “An improved approach to controller design of positive systems using controller gain decomposition,” J. Franklin Inst., vol. 354, no. 3, pp. 1356–1373, 2017.
R.C. Dorf, M. Farren, and C. Phillips, “Adaptive sampling frequency for sampled-data control systems,” IEEE Trans. Autom. Contr., vol. 7, no. 1, pp. 38–47, 1962.
P. Li et al., “Dynamic event-triggered control for networked switched linear systems,” in 2017 36th Chin. Contr. Conf., 2017, pp. 7984– 7989.
Y. Qi, P. Zeng, and W. Bao, “Event-triggered and self-triggered H₁ control of uncertain switched linear systems,” IEEE Trans. Syst. Man Cybern. Syst., pp. 1–13, 2018.
S. Xiao, Y. Zhang, and B. Zhang, “Event-triggered networked fault detection for positive Markovian systems,” Signal Process., vol. 157, pp. 161–169, 2019.
Y. Yin et al., “Event-triggered constrained control of positive systems with input saturation,” Int. J. Robust Nonlinear Contr., vol. 28, no. 11, pp. 3532–3542, 2018.
L. Liu et al., “Event-triggered control of positive switched systems based on linear programming,” IET Control Theory A., vol. 14, no. 1, pp. 145–155, 2020.
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D. Ding et al., “H₁ state estimation for discrete-time complex networks with randomly occurring sensor saturations and randomly varying sensor delays,” IEEE Trans. Neural Netw. Learn. Syst., vol. 23, no. 5, pp. 725–736, 2012.
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Autorzy i Afiliacje

Yanqi Wu

1

Junfeng Zhang

1

Shizhou Fu

1

School of Automation, Hangzhou Dianzi University, Hangzhou 310018, China

Analysis of the effect of inertial forces of the electrolyte flow on the ECM machining effects of curvilinear rotary surfaces

Jerzy Sawicki Tomasz Paczkowski Jarosław Zdrojewski

Archive of Mechanical Engineering | 2022 | vol. 69 | No 4 | 645-666 | DOI: 10.24425/ame.2022.143097

Słowa kluczowe centrifugal forces longitudinal forces electrochemical machining electrolyte flow computer simulation method of perturbation

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Abstrakt

This paper presents an analysis of the impact of inertial forces of the electrolyte flow in an interelectrode gap on the effects of ECM process of curvilinear rotary surfaces. Considering a laminar flow in the interelectrode gap, the equations of the flow of the mixture of electrolyte and hydrogen in the curvilinear orthogonal coordinate system have been defined. Two classes of equations of motion have been formulated, which differ in the estimates referred to the components of velocity and pressure, and which were analytically solved using the method of perturbation.
Using the machined surface shape evolution equation, the energy equation, and the analytical solutions for velocity and pressure, the ECM-characteristic distributions have been determined: of mean velocity, pressure, mean temperature, current density, gas phase concentration, the gap height after the set machining time for the case when there is no influence of inertial forces, the effect of centrifugal forces and, at the same time, centrifugal and longitudinal inertial forces.

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Bibliografia

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Autorzy i Afiliacje

Jerzy Sawicki

1

e-mail:

ORCID:

Tomasz Paczkowski

2

e-mail:

ORCID:

Jarosław Zdrojewski

3

e-mail:

ORCID:

Department of Mechanics and Computer Methods, Bydgoszcz University of Science and Technology, Bydgoszcz, Poland
Department of Manufacturing Techniques, Bydgoszcz University of Science and Technology, Bydgoszcz, Poland
Department of Digital Technology, Bydgoszcz University of Science and Technology, Bydgoszcz, Poland

A performance analysis of a hybrid golden section search methodology and a nature-inspired algorithm for MPPT in a solar PV system

Hazem H. Mostafa Amr M. Ibrahim Wagdi R. Anis

Archives of Electrical Engineering | 2019 | vol. 68 | No 3 | 611-627 | DOI: 10.24425/aee.2019.129345

Słowa kluczowe hybrid optimization golden sections search multi-verse optimization algo-rithm maximum power point tracking perturb and observe photovoltaic (PV)

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This research presents a comparative study for maximum power point tracking (MPPT) methodologies for a photovoltaic (PV) system. A novel hybrid algorithm golden section search assisted perturb and observe (GSS-PO) is proposed to solve the problems of the conventional PO (CPO). The aim of this new methodology is to boost the efficiency of the CPO. The new algorithm has a very low convergence time and a very high efficiency. GSS-PO is compared with the intelligent nature-inspired multi-verse optimization (MVO) algorithm by a simulation validation. The simulation study reveals that the novel GSS-PO outperforms MVO under uniform irradiance conditions and under a sudden change in irradiance.

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Hazem H. Mostafa

Amr M. Ibrahim

Wagdi R. Anis

Simulation of the proposed combined Fuzzy Logic Control for Maximum Power Point Tracking and Battery Charge Regulation used in CubeSat

Abderrahmane Seddjar Kamel Djamel Eddine Kerrouche Lina Wang

Archives of Electrical Engineering | 2020 | vol. 69 | No 3 | 521-543 | DOI: 10.24425/aee.2020.133916

Słowa kluczowe combined Fuzzy Logic Control Electrical Power System Photovoltaic system Maximum Power Point Tracking Battery Charge Regulation Perturb and Observe CubeSat

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Abstrakt

One of the most critical systems of any satellite is the Electrical Power System (EPS) and without any available energy, the satellite would simply stop to function. Therefore, the presented research within this paper investigates the areas relating to the satellite EPS with the main focus towards the CubeSat platform. In this paper, an appropriate EPS architecture with the suitable control policy for CubeSat missions is proposed. The suggested control strategy combines two methods, the Maximum Power Point Tracking (MPPT) and the Battery Charge Regulation (BCR), in one power converter circuit, in order to extract the maximum power of the Photovoltaic (PV) system and regulate the battery voltage from overcharging. This proposed combined control technique is using a Fuzzy Logic Control (FLC) strategy serving two main purposes, the MPPT and BCR. Without an additional battery charger circuit and without switching technique between the two controllers, there are no switching losses and the efficiency of the charging characteristic can be increased by selecting this proposed combined FLC. By testing a space-based PV model with the proposed EPS architecture, some simulation results are compared to demonstrate the superiority of the proposed control strategy over the conventional strategies such as Perturb and Observe (P&O) and FLC with a Proportional Integral Derivative (PID) controller.

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Autorzy i Afiliacje

Abderrahmane Seddjar

Kamel Djamel Eddine Kerrouche

Lina Wang

Compact Transverse Electric Silicon-on-Insulator Mode Converter for Mode-Division Multiplexer

Mohamed H. Sharaf Mohamed B. El-Mashade Ahmed A. Emran

International Journal of Electronics and Telecommunications | 2022 | vol. 68 | No 2 | 275-280 | DOI: 10.24425/ijet.2022.139878

Słowa kluczowe integrated optics silicon-on-insulator waveguide WDM & MDM systems perturbation theory integrated optical devices hybrid modes guided waves

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Abstrakt

On-chip optical-interconnect technology emerges as an attractive approach due to its ultra-large bandwidth and ultra-low power consumption. Silicon-on-insulator (SOI) wire waveguides, on the other hand, have been identified to potentially replace copper wires for intra-chip communication. To take advantage of the wide bandwidth of SOI waveguides, wavelengthdivision multiplexing (WDM) has been implemented. However, WDM have inherent drawbacks. Mode-division multiplexing (MDM) is a viable alternative to WDM in MIMO photonic circuits on SOI as it requires only one carrier wavelength to operate. In this vein, mode converters are key components in on-chip MDM systems. The goal of this paper is to introduce a transverse electric mode converter. The suggested device can convert fundamental transverse electric modes to first-order transverse electric ones and vice versa. It is based on small material perturbation which introduces gradual coupling between different modes. This device is very simple and highly compact; the size of which is 3 μm2. Mathematical expressions for both the insertion loss and crosstalk are derived and optimized for best performance. In addition, three-dimensional finite-difference time-domain (3D-FDTD) simulations are performed in order to verify the mathematical model of the device. Our numerical results reveal that the proposed device has an insertion loss of 1.2 dB and a crosstalk of 10.1 dB. The device’s insertion loss can be decreased to 0.95 dB by adding tapers to its material perturbation.

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Autorzy i Afiliacje

Mohamed H. Sharaf

1

Mohamed B. El-Mashade

1

Ahmed A. Emran

1

Electrical Engineering Department, Faculty of Engineering, Al-Azhar University, Cairo, Egypt

The growth and characterisation of type I GaSb/AlSb superlattice with a thin GaSb layer

Maciej Fokt Agata Jasik Iwona Sankowska Herbert S. Mączko Karolina M. Paradowska Krzysztof Czuba

Opto-Electronics Review | 2023 | 31 | 4 | e147912 | DOI: 10.24425/opelre.2023.147912

Słowa kluczowe Type I AlSb/GaSb superlattice 8-band k·p perturbation theory nextnano simulations AlSb layer degradation

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Abstrakt

This paper presents results of the characterisation of type I GaSb/AlSb superlattices (SLs) with a thin GaSb layer and varying thicknesses of an AlSb layer. Nextnano software was utilized to obtain spectral dependence of absorption and energy band structure. A superlattice (SL) with an energy bandgap of ~ 1.0 eV and reduced mismatch value was selected for experimental investigation. SLs with single (sample A) and double (sample B) AlSb barriers and a single AlSb layer (sample C) were fabricated using molecular beam epitaxy (MBE). Optical microscopy, high-resolution X-ray diffractometry, and photoluminescence were utilized for structural and optical characterisation. The presence of satellite and interference peaks in diffraction curves confirms the high crystal quality of superlattices. Photoluminescence signal associated with the superlattice was observed only for sample B and contained three low-intensity peaks: 1.03, 1.18, and 1.25 eV. The first peak was identified as the value of the energy bandgap of the SL. Other two peaks are related to optical transitions between defect states located at the interface between the SL and the top AlSb barrier. The time-dependent changes observed in the spectral characteristics are due to a modification of the SL/AlSb interface caused by the oxidation and hydroxylation of the AlSb layer.

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Autorzy i Afiliacje

Maciej Fokt

1 2

e-mail:

ORCID:

Agata Jasik

1

e-mail:

ORCID:

Iwona Sankowska

1

e-mail:

ORCID:

Herbert S. Mączko

3

e-mail:

ORCID:

Karolina M. Paradowska

1

e-mail:

ORCID:

Krzysztof Czuba

1 2

e-mail:

ORCID:

Łukasiewicz Research Network – Institute of Microelectronics and Photonics, Aleja Lotników 32/46, 02-668 Warsaw, Poland
Warsaw University of Technology, ul. Nowowiejska 15/19, 00-665 Warsaw, Poland
nextnano GmbH, Konrad-Zuse-Platz 8, 81829 München, Germany

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