scholarly journals Equivalent circuit simulation of light propagation in optical fiber

2009 ◽  
Vol 6 (7) ◽  
pp. 424-429
Author(s):  
Hiroki Nakajima ◽  
Takayuki Yamanaka
Keyword(s):  
Optical Fiber ◽  
Equivalent Circuit ◽  
Light Propagation ◽  
Circuit Simulation

Study of Fraunhofer Diffraction Pattern from a Circular Aperture Using an Optical Fiber Microprobe

2011 ◽  
Vol 378-379 ◽  
pp. 565-568
Author(s):  
Wan Maisarah Mukhtar ◽  
P. Susthitha Menon ◽  
Sahbudin Shaari
Keyword(s):  
Optical Fiber ◽  
Diffraction Pattern ◽  
Light Propagation ◽  
Optical Power ◽  
Transverse Motion ◽  
Circular Aperture ◽  
Fraunhofer Diffraction ◽  
Fresnel Number ◽  
Function Profile ◽  
Effect Of Light

Fraunhofer diffraction pattern from a circular aperture with the diameter of 10µm was observed using an optical fiber microprobe. The optical fiber microprobe started to detect optical power when the distance between the probe and the circular aperture was more than 292µm. When the probe was moved in a lateral motion, the light propagation showed a Bessel function profile. When the optical fiber microprobe was moved from 293µm to 309µm from the centre of the circular aperture in a transverse motion, the power detected was not consistent with a continuation of maxima and minima due to the effect of light propagation from the circular aperture. We also observed that the distance between the probe and the centre of the circular aperture was directly proportional with the radius of focused spot and inversely proportional with the Fresnel number.

scholarly journals A New Parameter-Extraction Method for DGS and its Application to the Low-Pass Filter

2004 ◽  
Vol 27 (2) ◽  
pp. 119-123 ◽  
Author(s):  
Haiwen Liu ◽  
Xiaowei Sun ◽  
Zhengfan Li
Keyword(s):  
Equivalent Circuit ◽  
Extraction Method ◽  
Circuit Simulation ◽  
Equivalent Circuit Model ◽  
Design Procedure ◽  
Parameter Extraction ◽  
Defected Ground Structure ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass

A new and simple parameter-extraction method for the equivalent circuit of defected ground structure (DGS) is presented. Using this method, circuit simulation, based on the DGS equivalent-circuit model, show excellent agreements with the electromagnetic (EM) simulation. Further, our method is applied effectively to design a low-pass filter (LPF) with DGS. Comparison between simulation and measurement confirm the validity of the LPF configuration and design procedure. Simple structure and high power handling capability are obtained from the proposed LPF.

Light Propagation Considerations For Internally Clad Sapphire Optical Fiber Using the 6Li(n,)3H Reaction

2021 ◽  
pp. 1-1
Author(s):  
Joshua Tyler Jones ◽  
Anthony Birri ◽  
Thomas E Blue ◽  
Dan Kominsky ◽  
Kelly M Mccary ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Light Propagation

Research on the effects of dual pumping on fast light propagation in an Er3+-doped optical fiber

2019 ◽  
Vol 16 (5) ◽  
pp. 055103 ◽  
Author(s):  
Wei Qiu ◽  
Yuan Gao ◽  
Yuqi Wu ◽  
Yujing Yang ◽  
Xian Zhang ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Light Propagation ◽  
Fast Light

scholarly journals Biosensor Using a One-Port Interdigital Capacitor: A Resonance-Based Investigation of the Permittivity Sensitivity for Microfluidic Broadband Bioelectronics Applications

Electronics ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 340 ◽  
Author(s):  
Giovanni Crupi ◽  
Xiue Bao ◽  
Oluwatosin John Babarinde ◽  
Dominique M. M.-P. Schreurs ◽  
Bart Nauwelaers
Keyword(s):  
Equivalent Circuit ◽  
Circuit Simulation ◽  
Equivalent Circuit Model ◽  
Microfluidic Channel ◽  
Circuit Model ◽  
Daily Lives ◽  
Fem Simulations ◽  
Interdigital Capacitor ◽  
High Frequency Structure Simulator ◽  
Local Equivalent

Electronics is a field of study ubiquitous in our daily lives, since this discipline is undoubtedly the driving force behind developments in many other disciplines, such as telecommunications, automation, and computer science. Nowadays, electronics is becoming more and more widely applied in life science, thus leading to an increasing interest in bioelectronics that is a major segment of bioengineering. A bioelectronics application that has gained much attention in recent years is the use of sensors for biological samples, with emphasis given to biosensors performing broadband sensing of small-volume liquid samples. Within this context, this work aims at investigating a microfluidic sensor based on a broadband one-port coplanar interdigital capacitor (IDC). The microwave performance of the sensor loaded with lossless materials under test (MUTs) is achieved by using finite-element method (FEM) simulations carried out with Ansoft’s high frequency structure simulator (HFSS). The microfluidic channel for the MUT has a volume capacity of 0.054 μL. The FEM simulations show a resonance in the admittance that is reproduced with a five-lumped-element equivalent-circuit model. By changing the real part of the relative permittivity of the MUT up to 70, the corresponding variations in both the resonant frequency of the FEM simulations and the capacitance of the equivalent-circuit model are analyzed, thereby enabling assessment of the permittivity sensitivity of the studied IDC. Furthermore, it is shown that, although the proposed local equivalent-circuit model is able to mimic faithfully the FEM simulations locally around the resonance in the admittance, a higher number of circuit elements can achieve a better agreement between FEM and equivalent-circuit simulation over the entire broad frequency going range from 0.3 MHz to 35 GHz.

scholarly journals Highly Sensitive Hydrogen Sensor Based on Palladium-Coated Tapered Optical Fiber at Room Temperature

2020 ◽  
Vol 2 (1) ◽  
pp. 8
Author(s):  
Mohammed Majeed Alkhabet ◽  
Saad Hayatu Girei ◽  
Suriati Paiman ◽  
Norhana Arsad ◽  
Mohd Adzir Mahdi ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Room Temperature ◽  
Light Propagation ◽  
Cost Effective ◽  
Hydrogen Sensor ◽  
X Ray ◽  
Multimode Optical Fiber ◽  
Casting Technique ◽  
H2 Sensor ◽  
Tapered Optical Fiber

This paper describes the application of a palladium (Pd)-coated tapered optical fiber in order to develop a hydrogen (H2) sensor. A transducing channel was fabricated with multimode optical fiber (MMF) with cladding and core diameters of 125 µm and 62.5 µm, respectively, in order to enhance the evanescent field of light propagation through the fiber. The multimode optical fiber was tapered from a cladding diameter of 125 µm to a waist diameter of 20 µm, waist-length of 10 mm, and down taper and up of 5 mm, and coated with Pd using the drop-casting technique. In order to establish the palladium’s properties, various characterization techniques were applied, such as Field Emission Scanning Electron Microscopy (FESEM), Energy Dispersive X-ray (EDX), and X-ray Diffraction (XRD). The developed palladium sensor functioned reproducibly at a gas concentration of 0.125% to 1.00% H2 at room temperature in the synthetic air. In this case, the response and recovery times were 50 and 200 s, respectively. Furthermore, this study demonstrated that the production of a dependable, effective, and reproducible H2 sensor by applying a basic, cost-effective method is possible.

Analysis on Equivalence between Transfer Function and Equivalent Circuit Simulation in General Hamiltonian Modeling

2012 ◽  
Vol 204-208 ◽  
pp. 4896-4899
Author(s):  
Jing Qian ◽  
Yun Zeng ◽  
Li Xiang Zhang ◽  
Tian Mao Xu
Keyword(s):  
Transfer Function ◽  
Equivalent Circuit ◽  
Circuit Simulation ◽  
Hamiltonian Function ◽  
Simulation Method ◽  
Generator System ◽  
Time Simulation ◽  
Internal Parameters ◽  
Hamiltonian Model ◽  
System Stabilizer

Take generator system included AVR (automatic voltage regulator) and PSS (power system stabilizer) as an example, Using the time simulation method, Study the equivalence between the transfer function model and the equivalent circuit simulation, and establish the corresponding relations between the circuit structures, internal parameters and transfer function parameters, based on the energy of equivalent circuit, the Hamiltonian function of transfer function is derived indirectly, and the Hamiltonian model is established. The study in this paper provides a new way to establish generalized Hamiltonian model for linear system based on transfer function.

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