scholarly journals Analysis of High Birefringence of Four Types of Photonic Crystal Fiber by Combining Circular and Elliptical Air Holes in Fiber Cladding

2008 ◽  
Vol 2008 ◽  
pp. 1-6 ◽  
Author(s):  
Yuan-Fong Chau ◽  
Han-Hsuan Yeh ◽  
Din Ping Tsai
Keyword(s):  
Photonic Crystal ◽  
Numerical Study ◽  
Effective Area ◽  
Statistical Correlations ◽  
High Birefringence ◽  
Crystal Fiber ◽  
Ring Number ◽  
Crystal Fibers ◽  
Type 3

This paper presents a numerical study of high birefringence induced by four types (Type 1–4) of different sizes of elliptical air holes in photonic crystal fibers (PCFs). The numerical simulation is carried out by using the finite element method. The statistical correlations between the birefringence and the various parameters are obtained. Based on our results, the birefringence is found to be largely dependent on the variation of the normalized frequency, size ratio, effective area of the circular and elliptical air holes, and the ring number of cladding. Two of our suggested structures, Type 1 and Type 3, can considerably enhance the birefringence in PCFs leading to values as high as7.697×10−3and8.002×10−3, respectively, which are much higher than that obtained by a conventional step-index fiber.

Highly Birefringent Extruded Elliptical-Hole Photonic Crystal Fiber

2013 ◽  
Vol 663 ◽  
pp. 387-391
Author(s):  
Xiu Ping Wang ◽  
Zhong Jiao He
Keyword(s):  
Photonic Crystal ◽  
Comparative Research ◽  
Elliptical Hole ◽  
Confinement Loss ◽  
High Birefringence ◽  
Crystal Fiber ◽  
Single Defect ◽  
Ring Number ◽  
Crystal Fibers ◽  
Air Hole

Highly birefringent extruded elliptical-hole photonic crystal fibers (PCFs) with single defect and double defect are proposed and investigated, which are supposed to be achieved by extruding conventional triangular-lattice circular-hole PCFs. Comparative research on the birefringence and the confinement loss of the proposed PCFs with single defect and double defect is presented. Simulated results show that the proposed extruded elliptical-hole PCFs with single defect and double defect can be with high birefringence up to the order of 10-2. Confinement loss increases when the ellipticity of the air hole of the proposed PCFs increases, which nevertheless can be overcome by increasing the ring number or the area of the air holes in the fiber cladding.

High Birefringent Terahertz Photonic Crystal Fiber Based on Material-Filled Structure

2013 ◽  
Vol 462-463 ◽  
pp. 599-603
Author(s):  
Jian Hua Li ◽  
Fei Huang ◽  
Yi Yang ◽  
Bao Fu Zhang ◽  
Hua Zhou
Keyword(s):  
Photonic Crystal ◽  
Structural Parameters ◽  
Refractive Indices ◽  
Plane Wave Expansion ◽  
Modal Birefringence ◽  
High Birefringence ◽  
Crystal Fiber ◽  
Crystal Fibers ◽  
Thz Applications ◽  
Large Frequency

A novel kind of high birefringent terahertz (THz) photonic crystal fibers (PCFs) with material-filled structure is proposed in this paper. Based on the material-filled technology, which different materials are selectively filled into four air holes of the inner first circle near the central core in the designed THz PCFs, high birefringence are obtained from the structural and material-filled induced asymmetry in large frequency ranges near 1THz. Modal birefringence with different structural parameters and diverse refractive indices of the filled materials are investigated by plane wave expansion (PWE) method. The numerical results show that high birefringence up to 10-3can be obtained and its structure is simpler than that of the early proposed highly birefringent THz PCFs. It is helpful for PCFs design and real fabrication in the potential THz applications.

SUPERCONTINUUM GENERATION IN SOLID-CORE PHOTONIC CRYSTAL FIBER INFILTRATED WITH WATER-ETHANOL MIXTURE

2020 ◽  
pp. 92-102
Author(s):  
Quang
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Numerical Study ◽  
Pump Energy ◽  
Ethanol Solution ◽  
Solid Core ◽  
Ethanol Mixture ◽  
Crystal Fiber ◽  
Dispersion Regime ◽  
Crystal Fibers

In this paper, we report a numerical study of the supercontinuum (SC) generation in solid-core photonic crystal fibers infiltrated with water-ethanol mixtures. A photonic crystal fiber is constructed as borosilicate glass NC21, which consists of 7 rings of air holes infiltrated with water-ethanol mixtures. We also considered numerically the influence of concentration of the ethanol solution on the dispersion of the fundamental mode. SC generation was demonstrated for the fiber long 20 cm with a pump pulse of 200 fs, the coupled energy of 0.5 nJ at the center wavelength of 1064 nm in the normal dispersion regime. The concentration of ethanol infiltrated to the fiber, the pulse of duration and the pump energy are investigated.

scholarly journals High sensitive triangular photonic crystal fiber sensor design applicable for gas detection

2021 ◽  
Vol 10 (1) ◽  
pp. 1-5
Author(s):  
A. Abbaszadeh ◽  
S. Makouei ◽  
S. Meshgini
Keyword(s):  
Photonic Crystal ◽  
Gas Sensor ◽  
Photonic Crystal Fiber ◽  
Relative Sensitivity ◽  
Effective Area ◽  
Industrial Applications ◽  
Confinement Loss ◽  
The Finite Element Method ◽  
High Birefringence ◽  
Crystal Fiber

A new triangular photonic crystal fiber with a based microstructure core gas sensor has been proposed for the wavelength range from 1.1μm to 1.7μm. The guiding trait of the proposed structure depends on geometric parameters and wavelength, which are numerically studied by the finite element method. According to the results, the relative sensitivity obtained as high as 75.14% at 1.33μm wavelength. high birefringence and effective area are also obtained by order of 3.75×10-3 and 14.07 μm2 finally, low confinement loss of 1.41×10-2 dB/m is acquired at the same wavelength. The variation of the diameters in the cladding and core region is investigated and the results show that this structure has good stability for manufacturing goals. Since the results show the highest sensitivity at wavelengths around 1.2μm to 1.7μm, which is the absorption line of many gases such as methane (CH4), hydrogen fluoride (HF), ammonia (NH3), this gas sensor can be used for medical and industrial applications.

High Birefringence and Negative Dispersion Based Modified Decagonal Photonic Crystal Fibers: A Numerical Study

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Anik Baul ◽  
Md. Biplob Hossain ◽  
Md. Nazmus Sakib ◽  
Md. Masud Rana ◽  
Md. Amzad Hossain ◽  
...  
Keyword(s):  
Numerical Study ◽  
Chromatic Dispersion ◽  
Single Mode ◽  
Effective Area ◽  
Single Mode Fiber ◽  
Relative Dispersion ◽  
Confinement Loss ◽  
High Birefringence ◽  
Negative Dispersion ◽  
Crystal Fibers

AbstractIn this paper, an extremely birefringent PCF based on a modified decagonal (MD-PCF) arrangement is studied for broadband compensation covering the S-, C- and L-communication bands wavelength ranging from 1460 to 1625 nm. It is made known in theory that it is conceivable to attain negative dispersion coefficient about − 448 to − 835 ps/nm/km covering S-, C- and L-communication bands as well as a relative dispersion slope near to single mode fiber (SMF) of 0.0036 nm−1. On the basis of simulation results incorporating finite-element method based COMSOL multiphysics software, birefringence is obtained as high as 1.7 × 10−2, which is definately greater than conventional step-index fiber (SIF) and circular air- holes PCF so far. We also discuss the characteristics of chromatic dispersion, effective area and confinement loss of the designed PCF.

scholarly journals Analysis of Hexagonal Photonic Crystal Fiber Using the Golden Ratio

2018 ◽  
Vol 7 (3.13) ◽  
pp. 5
Author(s):  
Atta Rahman ◽  
Emeroylariffion RAbas ◽  
Feroza Begum
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Data Transmission ◽  
Chromatic Dispersion ◽  
Golden Ratio ◽  
Effective Area ◽  
Confinement Loss ◽  
Layer Boundary ◽  
Crystal Fiber ◽  
Crystal Fibers

In this research, the proposed hexagonal photonic crystal fibers design is modelled using the principle of golden ratio; fixing the proportion of pitch to diameter of the air holes constant. Finite element method with perfectly matched layer boundary is used for numerical simulation of different properties. It is shown that the proposed design has lower effective area of below 9 μm2, low chromatic dispersion value of below 57 ps/(km.nm) and confinement loss of less than 0.01 dB/km at 1.55 μm wavelength. The proposed hexagonal photonic crystal fiber is applicable for data transmission systems.  

scholarly journals A Highly Birefringent Photonic Crystal Fiber for Terahertz Spectroscopic Chemical Sensing

Sensors ◽  
2021 ◽  
Vol 21 (5) ◽  
pp. 1799
Author(s):  
Tianyu Yang ◽  
Liang Zhang ◽  
Yunjie Shi ◽  
Shidi Liu ◽  
Yuming Dong
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Chemical Sensing ◽  
Numerical Aperture ◽  
Wide Band ◽  
Relative Sensitivity ◽  
Chemical Sensitivity ◽  
High Birefringence ◽  
Crystal Fiber ◽  
Polarization Maintaining

A photonic crystal fiber (PCF) with high relative sensitivity was designed and investigated for the detection of chemical analytes in the terahertz (THz) regime. To ease the complexity, an extremely simple cladding employing four struts is adopted, which forms a rectangular shaped core area for filling with analytes. Results of enormous simulations indicate that a minimum 87.8% relative chemical sensitivity with low confinement and effective material absorption losses can be obtained for any kind of analyte, e.g., HCN (1.26), water (1.33), ethanol (1.35), KCN (1.41), or cocaine (1.50), whose refractive index falls in the range of 1.2 to 1.5. Besides, the PCF can also achieve high birefringence (∼0.01), low and flat dispersion, a large effective modal area, and a large numerical aperture within the investigated frequency range from 0.5 to 1.5 THz. We believe that the proposed PCF can be applied to chemical sensing of liquid and THz systems requiring wide-band polarization-maintaining transmission and low attenuation.

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