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Dual communication windows polarization filter based on photonic crystal fiber with nano-scale gold film
摘要： A photonic crystal fiber (PCF) polarization filter with dual communication bands is proposed in this paper. The polarization characteristics of the double-hole gold-coated PCF are numerically analyzed by utilizing the finite element method (FEM). As we know, the filter can achieve polarization filtering effect on input signals at 1310 nm (y-polarized mode) and 1550 nm (x-polarized mode) bands simultaneously in two orthogonal polarization states. In the above two communication bands, the confinement losses of the unwanted polarization mode can reach 192.7 dB/cm (y-polarized mode) and 427.5 dB/cm (x-polarized mode), whereas other polarization mode losses are very low. Furthermore, when the transmission length of the PCF is 800 μm, x and y polarization mode crosstalk can reach ?275.4 and 126.9 dB in the 1550 and 1310 nm bands, respectively. Meanwhile, the crosstalk is less than ?20 dB or better than 20 dB, the optical bandwidth can reach 220 and 150 nm, respectively.
关键词： Photonic crystal fiber,Polarization filter,Surface plasmon resonance,Dual communication windows
更新于2025-09-10 09:29:36
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Small coupling length with a low confinement loss dual-core liquid infiltrated photonic crystal fiber coupler
摘要： In this paper, a dual-core liquid ?lled photonic crystal ?ber coupler (PCFC) with rectangular (RPCFC) and hexagonal (HPCFC) geometry is presented from the 1200 to 1800 nm wavelength range. In the proposed design, super ?int (SF10) glass is used as the background material and water, chloroform, and benzene are in?ltrated in the dual-core, independently. The properties of the guided modes are studied by the ?nite di?erence time domain (FDTD) method with a perfectly matched layer (PML) boundary condition. Results reveal very small con?nement loss with a low coupling length and birefringence for the wide wavelength range. At the 1.55 μm wavelength, RPCFC shows 0.000318, 0.000358, and 0.000379 m coupling lengths for the water, chloroform, and benzene ?lled dual-core, respectively. Additionally, the con?nement loss of 1.57×10?7, 1.22×10?7, and 1.05×10?7 db/km is achieved through RPCFC. Moreover, both the PCFCs present a small polarization variation. Therefore, the proposed PCFC models can be used in optical communication systems, and polarization-independent and high temperature-sensitive applications areas.
关键词： coupling length,liquid filled,birefringence,dual-core,photonic crystal fiber coupler,confinement loss
更新于2025-09-10 09:29:36
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Finite-Difference Time-Domain Analysis of Tapered Photonic Crystal Fiber
摘要： This paper brief about the simulation of tapered photonic crystal fiber (PCF) LMA-8 single-mode type based on correlation of scattering pattern at wavelength of 1.55 μm, analyzation of transmission spectrum at wavelength over the range of 1.0 until 2.5 μm and correlation of transmission spectrum with the refractive index change in photonic crystal holes with respect to taper size of 0.1 until 1.0 using Optiwave simulation software. The main objective is to simulate using Finite-Difference Time-Domain (FDTD) technique of tapered LMA-8 PCF and for sensing application by improving the capabilities of PCF without collapsing the crystal holes. The types of FDTD techniques used are scattering pattern and transverse transmission and principal component analysis (PCA) used as a mathematical tool to model the data obtained by MathCad software. The simulation results showed that there is no obvious correlation of scattering pattern at a wavelength of 1.55 μm, a correlation obtained between taper sizes with a transverse transmission and there is a parabolic relationship between the refractive index changes inside the crystal structure.
关键词： scattering pattern,photonic crystal fiber,optiwave,transmission spectrum,tapered
更新于2025-09-10 09:29:36
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Numerical investigation and analysis of flattened dispersion for supercontinuum generation at very low power using Hexagonal shaped Photonic crystal fiber (H-PCF)
摘要： In this work, we report a design of hexagonal photonic crystal fiber (PCF) with eight hexagonal rings with modified air hole size at the innermost ring. We analyze and compare the major optical parameters of a PCF such as dispersion and nonlinearity over the span of wavelength ranges from 800 nm to 1600 nm at different core diameters. The designs exhibit a high nonlinearity of 220 W-1 km-1 at 800 nm for supercontinuum generation in designed PCF and along the dispersion in negative characteristics about ?650 ps/nm.km at 1310 nm with two zero dispersion wavelengths at 864 nm and at 1484 nm are numerically studied. In addition, we investigate the numerical modeling of supercontinuum (SC) generation in the designed PCFs and nearly 600 nm using 50 fs pulse with 2 kW pump power at 800 nm spectrum have been observed.
关键词： Soliton pulse,Supercontinuum generation,Photonic crystal fiber,Nonlinear Schr?dinger equation,Two zero dispersion wavelength
更新于2025-09-10 09:29:36
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Enhanced sensitivity of hemoglobin sensor using dual-core photonic crystal fiber
摘要： A Hemoglobin (Hb) biosensor based on dual-core photonic crystal fiber is proposed and analyzed. In this paper, the effective refractive index dependency on the Hb concentration within a blood sample is utilized in obtaining the transmission spectrum variation. The results are calculated using full vectorial finite element method. Through this study, the effect of the structure geometrical parameters on the sensor performance is optimized to maximize the sensor sensitivity. The numerical results show a sensitivity of 8.013 nm/g/dL for the X-polarized mode at 3.7 cm fiber length and 7.68 nm/g/dL for the Y-polarized mode at 3.2 cm fiber length of the proposed sensor.
关键词： Coupling length,Finite element method,Transmission spectrum,Dual-core photonic crystal fiber,Hemoglobin concentration
更新于2025-09-10 09:29:36
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Realization of absorber, reflector and transmitter using single photonic structure
摘要： The present communication deals with a metamaterial based single photonic crystal fiber (PCF) to realize absorber, reflector, and transmitter application. The simulation studies which is made with the help of plane wave expansion method infers that the configuration including lattice spacing and diameter of air holes of the photonic crystal fiber along with the nature of the material play an important role to realize the aforementioned applications. Furthermore, the novelty of this work is that single PCF structure bestows absorber, reflector, and transmitter
关键词： transmitter,Meta-material,absorber,photonic crystal fiber,reflector
更新于2025-09-10 09:29:36
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Radiation-Induced Effects on Fiber Bragg Gratings inscribed in Highly Birefringent Photonic Crystal Fiber
摘要： The Fiber Bragg Gratings (FBGs) inside Photonic Crystal Fibers having high fiber birefringence, such as in PCF with butterfly shape microstructure, are characterized by two Bragg peaks. The spectral distance between these two peaks is not affected by a change of temperature or by a longitudinally applied strain, but this spectral separation evolves when the sensor is subjected to a transversal strain. This makes such FBGs inscribed in highly birefringent PCFs very interesting for structural health monitoring of civil structures, as well as for operation in harsh environments such as the ones associated with the nuclear industry. In this work, we monitor the Radiation-Induced Bragg Wavelength Shift (RI-BWS) of the punctual sensor and the Radiation-Induced Attenuation (RIA) in the fiber used for its inscription up to a dose of 1.5 MGy(SiO2). Even if we observe a RI-BWS for both Bragg peaks, the spectral distance between them only slightly evolves, of less than 10 pm. These gratings are then very promising sensors for the structural health monitoring of nuclear facilities.
关键词： radiation effects,Fiber Bragg Grating,pressure sensors,Photonic Crystal Fiber
更新于2025-09-09 09:28:46
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Ultrasensitive long-period gratings sensor works near dispersion turning point and mode transition region by optimally designing a photonic crystal fiber
摘要： A novel and ultrasensitive long-period gratings (LPGs) sensor based on photonic crystal fiber (PCF) has been proposed and theoretically investigated. The surrounding refractive index (SRI) sensitivity can be improved enormously by optimizing structure parameters of PCF to ensure LPGs work near dispersion turning point (DTP). Based on this, mode transition (MT) has been also designed and realized in LPGs based on PCF for the first time to further explore the theoretical limit of sensitivity. The simulation results illustrated that the optimized SRI sensitivity is 67,600 nm/RIU in low RI measurement region (1.334–1.344), which is much higher than that of other reported LPGs sensor based on PCF in previous literatures. The competitive advantages make the proposed sensor has a great application prospect in biosensing field, such as biomolecules detection and label-free immune sensing.
关键词： Long period gratings,Mode transition,Photonic crystal fiber,Dispersion turning point
更新于2025-09-09 09:28:46
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Design and analysis of a Zeonex based diamond-shaped core kagome lattice photonic crystal fiber for T-ray wave transmission
摘要： A new kind of Zeonex based single mode photonic crystal fiber (PCF) has been designed and analysed for low loss terahertz wave transmission. The novel twist is introduced in a kagome lattice PCF by placing a diamond shaped core. Various geometrical parameters including core diameter, pitch distance, porosity, strut length and strut width are adjusted to optimize the PCF. Using Finite Element Method (FEM) simulation results show a low effective material loss (EML) of 0.04 cm?1 that is 80% lower than bulk material absorption loss of Zeonex, low confinement loss of 0.0001 cm?1 at 1 THz frequency and near zero flattened dispersion variation of 0.98 ± 0.09 ps/THz/cm with 1 THz transmission bandwidth. Owing to the above remarkable properties, the proposed waveguide can be a suitable candidate for improved transmission of terahertz waves.
关键词： Waveguide,Photonic crystal fiber,Dispersion,Terahertz,Effective material loss
更新于2025-09-09 09:28:46
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Highly Nonlinear, Dispersion Flattened Equiangular Spiral Photonic Crystal Fiber in Telecommunications Window
摘要： This paper presents an equiangular spiral (ES) cladding photonic crystal fiber (PCF) made of lead silicate glass SF57. The proposed ES-PCF exhibits a flat dispersion at the telecommunications window with high nonlinearity and low confinement loss, showing an ultra-flattened dispersion at wavelengths ranging from 1.51 to 1.81 μm (300 nm band), with confinement losses of less than 0.0031 dB/km within this wavelength range, and two zero-dispersion wavelengths at 1.55 and 1.76 μm. Moreover, this fiber also has a high nonlinear coefficient of 1285 W-1km-1 at 1.55 μm.
关键词： Photonic crystal fiber,Ultra-flattened dispersion,Confinement loss,High nonlinearity
更新于2025-09-09 09:28:46