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    A flexible multiplexing method of FBG sensors based on OFDR

    Yang N.Zhang J.Yu L.Sun H....
    12页
    查看更多>>摘要：A flexible multiplexing method of fiber Bragg grating (FBG) sensors based on optical frequency domain reflectometer (OFDR) is proposed in this paper to reduce the influence of spectral shadow effect on measurement and improve the reliability and measurement flexibility of FBG sensing network. In this method, the interrogation principle of FBG position and wavelength shift based on OFDR is analyzed, and as a guide, the flexible multiplexing FBG array is designed, in which multi-channel identical weak reflection FBGs are interrogated using a photoelectric detector. Meanwhile, the crosstalk beat noise generated by the flexible multiplexing FBG array is avoided so as to improve the performance of the measurement. The experiment results show that the method presented in this paper can achieve the flexible multiplexing of multi-channel FBGs with a single acquisition channel, while the measurement accuracy can be guaranteed.
      原文链接:
    • NSTL
    • Elsevier

    Transport properties of the deformed quaternary InGaAsP epitaxied on different substrates

    Erguig H.Benahmed A.Migalska-Zalas A.Tarbi A....
    5页
    查看更多>>摘要：? 2022 Elsevier GmbHImproving transport phenomena and increasing the absorption of III-V materials is a major research topic. These properties are affected by several factors. Understanding the link between substrate choice and transport properties is essential. In this study, the constraints due to lattice mismatch and its impact on the transport properties of the In1?xGaxAsyP1?y alloy epitaxially grown on different substrates were studied according to the arsenic and indium content. The variation in the transport properties by varying the pressure from 0 to 120 kbar and the temperature from 0 to 500 K has also been studied. The effect of the substrate (InP, GaAs, or ZnSe) on quaternary absorption peaks was also examined.
      原文链接:
    • NSTL
    • Elsevier

    The crawler-type roll to plate continuous microstructure rolling process

    Weng Y.-J.Wang Z.-J.Wei J.-L.Lin C.-Y....
    5页
    查看更多>>摘要：? 2022 Elsevier GmbHFocusing on a crawler-type roll to plate (R2P) continuous micro-structure rolling process, this study proposed a technology integrating the extrusion molding machine system, graphene roller, graphene crawler, magnetic control system, and crawler-type R2P continuous micro-structure rolling process. The machine was designed, assembled, and tested. The graphene crawler and precision control system were fabricated to complete the continuous micro-structural array rolling process with the extruder and discuss the crawler-type R2P continuous micro-structure rolling process by simulation and the actual test. The experimental results suggest that the proposed innovative process technology can effectively improve the molding of imprint replication, and the magnetic control can effectively solve the spring back caused by the excessive imprint speed and reduce the processing time.
      原文链接:
    • NSTL
    • Elsevier

    Triple-layer array splitter for zeroth-order suppressing under normal incidence

    Xiong Z.Wang B.Zhou J.
    5页
    查看更多>>摘要：? 2022 Elsevier GmbHA novel triple-layer array dual-port transmission beam splitter grating with zeroth-order suppressed under normal incidence is described in this paper. The parameters of the grating structure and characteristics of the incident light are analyzed by rigorous coupled-wave analysis (RCWA) and optimized by simulated annealing (SA) algorithm. The grating displays the feature of polarization-independent. To study the specific process of energy coupling in the grating, the simplified modal method (SMM) was added to this paper for analyzing. With the incidence wavelength of 800 nm, high effective efficiencies of 93.08% for TE polarization and 95.48% for TM polarization can be achieved in the ± 1st orders. Furthermore, the proposed beam splitter can exceed the efficiencies of 90% for TE and TM polarizations within a large tolerance range of the period, duty cycle, and incident wavelength.
      原文链接:
    • NSTL
    • Elsevier

    The bell-shaped perturbed dispersive optical solitons of Biswas–Arshed equation using the new Kudryashov's approach

    Ozisik M.Secer A.Bayram M.
    5页
    查看更多>>摘要：? 2022 Elsevier GmbHPurpose: This study aimed to examine the effects of the parameters, the group velocity dispersion (GVD), the third-order dispersion (3OD), spatio-temporal dispersion (STD), the third-order spatio-temporal dispersion (TO-STD), self-steepening effect and nonlinear dispersions terms, included in the equations modeling optical fiber phenomena on the optical solitons. Therefore, the aim of this study is not to apply a method to derive different types of optical soliton solutions and their graphical representation. For this purpose, the Biswas–Arshed equation, which is the important equation to model to compensate for the effects of dispersion in the case of nonlinearity and to provide the necessary balance for soliton propagation to continue, is investigated by utilizing the new Kudryashov approach. Methodology: First, the nonlinear ordinary differential (ODE) form of the investigated problem was obtained by using the complex wave transform. Afterward, a linear equation system was created using the new Kudryashov scheme, the appropriate solution sets were found, and the bell-shaped soliton, which was desired to be examined, was obtained by using these sets and selecting the suitable parameter values. Depending on the definition of the Biswas–Arshed equation and the constraints of the method, two-dimensional graphical views were obtained, and necessary comments were made to better observe the effect by giving different values to the parameters whose effect is desired to be examined. Findings: At the end of the detailed examination, important and fundamental findings were obtained. Such that the model parameters do not only consist of a set of numerical values that can be given to obtain various soliton graphics, but also, the model parameters have a crucial effect on the soliton behavior. In addition, parameter values should be determined by evaluating both each other and the physical design of the investigated equation. Originality: This study, which examines the effects of model parameters on the behavior of the Biswas–Arshed equation on the behavior of bell shape soliton, is presented for the first time in this article.
      原文链接:
    • NSTL
    • Elsevier

    Photonic crystal fiber refractive index temperature sensor based on double spherical cascade

    Zheng X.Liu Y.Wang Z.Gao P....
    5页
    查看更多>>摘要：? 2022 Elsevier GmbHA dual spherical photonic crystal fiber (PCF) Mach-Zender refractive index temperature sensor is proposed. The sensing structure is a PCF fused to a spherical structure made of two single-mode fibers, of which the two spherical structures serve as beam splitter and coupler, respectively, for refractive index sensing experiments. In addition, temperature sensing experiments were conducted by filling the middle PCF with ethanol using the same structure. Experimental results show a maximum sensitivity of 190.26 nm/RIU for the wavelength drift of the resonance valley of the interference spectrum in the refractive index range of 1.348–1.358. The maximum sensitivity of the wavelength drift of the resonant valley of the interference spectrum is ? 0.306 nm/°C for temperatures in the range of 40–50 °C. The sensor studied in this paper is characterized by high sensitivity, simple manufacturing, and low cost.
      原文链接:
    • NSTL
    • Elsevier

    Sequel to “Quasi-monochromatic dynamical system of cubic–quartic optical solitons with Kerr law of nonlinear refractive index” (Power law)

    Alshehri H.M.Maturi D.A.Al-Bogami D.H.Biswas A....
    5页
    查看更多>>摘要：? 2022 Elsevier GmbHThis paper presents the adiabatic dynamical system of cubic–quartic soliton conserved quantities in presence of perturbation terms. The considered nonlinearity is with power law. The slow velocity change is also computed and exhibited.
      原文链接:
    • NSTL
    • Elsevier

    Analytical solutions of (2+1)-dimensional time conformable Schr?dinger equation using improved sub-equation method

    Ozkan E.M.Akar M.
    5页
    查看更多>>摘要：? 2022 Elsevier GmbHIn this work, the improved sub-equation method is used to get exact analytical solutions for the (2+1)-dimensional time conformable Schr?dinger equation with beta-derivative. This method has been used to get generalized hyperbolic function solutions, generalized trigonometric function solutions, and rational solutions. The novel structures of solutions are illustrated when appropriate parameter values have been assigned. The physical surfaces of certain obtained solutions have been visually shown in various formats, which aids in comprehending the complicated physical phenomena of these dynamical models. The findings demonstrate the superiority of the performed method, which can be used to solve a wide range of nonlinear physical equations.
      原文链接:
    • NSTL
    • Elsevier

    Design of all-optical 6:3 binary counter based on symmetrical stacking using optical micro ring resonators

    Rao V.Mandal S.
    5页
    查看更多>>摘要：? 2022 Elsevier GmbHIn this study, we demonstrate a fast all-optical 6:3 binary counter using an optical micro ring resonator (OMRR) and Symmetric Stacking. The number of 1′s in the supplied binary sequence is counted by this counter. To create the proposed 6:3 counter, first stack all of the input bits, i.e. all of the “1” bits then the 6-bit count output can be obtained by stacking the input bits and converting the stack to a binary count. All logic and stacking units of the 6:3 counter will be designed using OMRR in the suggested structure. The proposed all optical symmetric stacking based fast binary counters has been simulated in MATLAB working platform.
      原文链接:
    • NSTL
    • Elsevier

    Box–Behnken response surface methodology design for amaranth dye degradation using gold nanoparticles

    Nachiyar G.K.V.Surendra T.V.Kuppusamy P.Basavegowda N....
    5页
    查看更多>>摘要：? 2022 Elsevier GmbHThe primary goal of this study was to synthesize Au NPs utilizing a green synthetic approach. For the first time, an aqueous extract of Aristolochia bracteata leaves was used as a reducing and capping agent to produce Au NPs from gold ions. The shape of the produced Au NPs was determined using Field-Emission Scanning Electron Microscopy (FE-SEM) and Transmission Electron Microscopy (TEM) to be spherical and 50–60 nm in size. Powder X-ray diffraction was used to examine the crystallinity of Au NPs, and Fourier Transform Infrared Spectroscopy was used to determine the functional groups involved in the conversion of gold ions into Au NPs. The Au NPs were evaluated as photocatalytic agents for amaranth dye degradation, and the findings revealed that 94.6% of the dye was degraded in 90 min. A first-order kinetic model was used to calculate the deterioration rate. Furthermore, the photocatalytic reaction's Quantum Yield (QY) was estimated, and the degradation rate was optimized using the Response Surface Methodology (RSM) approach.
      原文链接:
    • NSTL
    • Elsevier