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- 摘要
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- 实验方案
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Highly sensitive strain sensor based on a novel Mach–Zehnder mode interferometer with TCF-PCF-TCF structure
摘要： We have demonstrated a high-sensitivity strain sensor based on a novel photonic crystal fiber (PCF) interferometer by means of splicing two sections of thin core fibers (TCF) with a piece of PCF between two single mode fibers (SMFs). The proposed MZI has exhibited an excellent fringe visibility as high as 21 dB in air. Particularly, the measurement range was up to 4 m ε and a strain sensitivity of ?1.89 pm/με was achieved. It was found that the strain sensitivity of the MZI was weekly dependent on the PCF length. The measured sensitivities of the MZI with 25 mm, 30 mm and 35 mm PCF at ～1590 nm were ?1.83 pm/με, ?1.85 pm/με and ?1.77 pm/με, respectively. Moreover, the temperature characteristics of the sensor were also investigated. Additionally, the sensor has advantages of simplicity of fabrication, low cost, compact size as well as large strain measurement range.
关键词： Strain sensor,Mach–Zehnder interferometer (MZI),Photonic crystal fiber (PCF),Thin core fiber (TCF)
更新于2025-09-23 15:23:52
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A nonlinear photonic crystal fiber for liquid sensing application with high birefringence and low confinement loss
摘要： This paper presents a nonlinear Photonic Crystal Fiber (PCF) based sensor to detect liquid analytes. An extensive analysis has been presented at wide range of wavelength (0.6 μm?1.6 μm) in order to investigate the impact of some design parameters. The numerical investigation has been done using the full vector Finite Element Method (FEM). The proposed model provides an outstanding nonlinear coefficient value with high birefringence, high sensitivity, and low confinement loss. The designed model can be used in sensing and bio-sensing research and their applications.
关键词： Effective Area,Sensitivity,Nonlinearity,Confinement loss,Photonic Crystal Fiber,Birefringence
更新于2025-09-23 15:23:52
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Photonic Crystal Fibres PCF for Different Sensors in Review
摘要： In this work, we present the update results for using the PCF as a sensors application, where we have chosen a modern collection of manuscripts previously published in scientific journals in the field of optical, biological and chemical sensors. So we compared their presented results, in order to reach the best results previously published in the use PCF for optical, biological and chemical sensors.
关键词： PCF,Sensors,Refractive Index Sensors,Photonic Crystal Fiber,Gass Sensors
更新于2025-09-23 15:23:52
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Highly sensitive temperature sensor based on Sagnac interferometer with liquid crystal photonic crystal fibers
摘要： We propose and investigate a temperature sensor based on Sagnac interferometer with liquid crystal (LC) photonic crystal fiber (PCF) by finite element method (FEM). LC E7 which is anisotropic under electrical field is designed to be infiltrated into the cladding air holes of PCF. The birefringent PCF is then launched into a Sagnac interferometer. The interference spectrum of the Sagnac interferometer is influenced by the thermal effect of LC E7 and thus could be used to measure the temperature. The simulation results show that the temperature measuring sensitivity and resolution reach to 15 nm/K and 6.7E?4 K in the range of 290–320 K. The measuring range and sensitivity could be modified further by optimizing the PCF structure parameters.
关键词： Temperature sensor,Liquid crystal,Sagnac interferometer,Photonic crystal fiber
更新于2025-09-23 15:22:29
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Simultaneously achieving a large negative dispersion and a high birefringence over Er and Tm dual gain bands in a square lattice photonic crystal fiber
摘要： We proposed a novel photonic crystal fiber composed of a double-cladding square lattice that could be used in dual-band, Er and Tm optical gain bands, simultaneously supporting a large negative dispersion and a high birefringence. We theoretically investigated the light guiding property through the proposed PCF by using a vectorial finite element method (FEM) with a perfectly matched layer (PML). By optimizing the structural parameters, we obtained an ultra-large negative dispersion of -20,186ps/(nm?km) and a very high birefringence of 9.27 ×10-3 at the wavelength of 1.55μm in the Er gain band and a very large negative dispersion of -8,067ps/(nm?km) and a high birefringence of 1.0 ×10-3 at the wavelength of 1.87μm in the Tm band. We further discussed the roles of waveguide parameters on the chromatic dispersion, its slope, and the birefringence of the fiber as well as the mode field diameter. The proposed fiber could be directly applied for dual-band dispersion and polarization control in fiber laser cavities as well as optical communications and sensors in the dual bands.
关键词： Thulium band,Erbium band,Negative dispersion,High birefringence,Photonic crystal fiber
更新于2025-09-23 15:22:29
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Cascaded Two-core PCFs based In-line Fiber Interferometer for Simultaneous Measurement of Strain and Temperature
摘要： A new fiber sensor configuration based on the cascaded in-line fiber interferometers has been proposed and experimentally demonstrated for simultaneous measurement of strain and temperature. In order to make the cascaded in-line interferometers, we used two different types of two-core photonic crystal fibers (TCPCFs) having two cores in the symmetry and asymmetry structures. The TCPCFs have different transmission characteristics owing to the distinct geometric structures of the integrated cores, this causes the different strain and temperature sensitivities and thus the two parameters can be discriminated. The measurement resolutions are achieved to be 11.1 με and 1.10 oC for strain and temperature, respectively, in the 10 pm wavelength resolution.
关键词： Mach-Zehnder interferometer,Two-core photonic crystal fiber,strain and temperature sensor
更新于2025-09-23 15:22:29
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High Sensitivity Photonic Crystal Fiber Refractive Index Sensor with Gold Coated Externally Based on Surface Plasmon Resonance
摘要： In this paper we propose a gold-plated photonic crystal fiber (PCF) refractive index sensor based on surface plasmon resonance (SPR), in which gold is coated on the external surface of PCF for easy fabrication and practical detection. The finite element method (FEM) is used for the performance analysis, and the numerical results show that the thickness of the gold film, the refractive index of the analyte, the radius of the air hole in the first layer, the second layer, and the central air hole can affect the sensing properties of the sensor. By optimizing the sensor structure, the maximum wavelength sensitivity can reach 11000 nm/RIU and the maximum amplitude sensitivity can reach 641 RIU?1. Due to its high sensitivity, the proposed sensor can be used for practical biological and chemical sensing.
关键词： sensor,surface plasmon resonance,refractive index,finite element method,Photonic crystal fiber
更新于2025-09-23 15:22:29
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Rectangular Lattice Photonic Crystal Fiber with Simultaneous Polarization Filtering at Communication Wavelengths of 1310 nm and 1550 nm
摘要： In this study, we developed a tunable photonic crystal fiber (PCF) polarized filter with a gold coating and liquid filling, which was investigated using the full-vector finite-element method. The gold that selectively filled the cladding air holes acted as a defect mode. When light was transmitted into the core, the energy was transferred from the core mode to the defect mode at a given wavelength and a resonance peak was obtained. Numerical results showed that the proposed PCF could be implemented simultaneously for polarization filtering in the communication windows of 1.31 and 1.55 μm. The confinement losses for the y-polarized mode were 251.5 dB/cm for 1.31 μm and 375.3 dB/cm for 1.55μm. When the fiber length was 90 μm, the corresponding bandwidths were just less than 20 and 70 nm for 1.31 and 1.55 μm, respectively. The bandwidths are the narrowest obtained and they are conducive to applications in integrated systems. We also studied the effects of structural parameters on the resonance performance. The optical fiber structure could be optimized further to obtain better results.
关键词： Photonic crystal fiber,Polarization filter,Full-vector finite element method
更新于2025-09-23 15:21:21
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Fiber temperature and humidity sensor based on photonic crystal fiber coated with graphene oxide
摘要： A temperature and humidity sensor based on photonic crystal fiber(PCF) coated with graphene oxide (GO) cascaded with two spherical structures is presented and demonstrated. The principle of this sensor is based on Mach–Zehnder interferometer (MZI), and the interference spectrum is sensitive to the change of temperature and humidity. Because of the hydrophilic property of GO, refractive index (RI) of the fiber surface changes significantly with the variation of humidity. Therefore, the GO film deposited on the PCF surface can improve the humidity sensitivity of the sensor. Experimental results show that the temperature sensitivities are 0.063 nm/?C and 0.086 nm/?C from 10?C to 70?C. The humidity sensitivities are 0.128 nm/%RH and 0.159 nm/%RH from 30% to 70%. Moreover, it also contains the following advantages: low cost, simple construction, and high sensitivity.
关键词： Photonic crystal fiber (PCF),Graphene Oxide (GO),Optical fiber sensor,Humidity,Temperature
更新于2025-09-23 15:21:01
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[IEEE 2018 IEEE 7th International Conference on Photonics (ICP) - Langkawi, Malaysia (2018.4.9-2018.4.11)] 2018 IEEE 7th International Conference on Photonics (ICP) - Modal Properties of a Varied High Indexed Large Core 4-Mode Photonic Crystal Fiber
摘要： A varied high indexed, large core 4-mode photonic crystal fiber is proposed. Consequences of variation in the refractive index of the materials used in the rings have been analyzed through the far field distribution and phase of each mode. The influence of different, air hole diameters and distances between the holes of the fiber is studied.
关键词： refractive index,germanium doped fiber,photonic crystal fiber,design
更新于2025-09-23 15:21:01