Numerical Analysis of Spatial Mode-Field Overlap on Confinement Loss in Negative-Curvature Fibers

2020 ◽  
Author(s):  
Ang Deng ◽  
Md Imran Hasan ◽  
Yuxi Wang ◽  
Wonkeun Chang
Keyword(s):  
Numerical Analysis ◽  
Negative Curvature ◽  
Confinement Loss ◽  
Spatial Mode ◽  
Mode Field

Study on the high birefringence and low confinement loss terahertz fiber based on the combination of double negative curvature and nested claddings

2021 ◽  
Author(s):  
ZiWei Yuan ◽  
Yi Wang ◽  
dexian yan ◽  
Mingxuan Cao ◽  
Miao Meng ◽  
...  
Keyword(s):  
Negative Curvature ◽  
Confinement Loss ◽  
Double Negative ◽  
Polarization Mode ◽  
Fiber Structure ◽  
Frequency Range ◽  
Broad Bandwidth ◽  
High Birefringence ◽  
Mode Field ◽  
Field Area

Abstract A novel double negative curvature nested fiber structure is designed by adding extra circular cladding tubes to enhance the birefringence and reduce the confinement loss. The fiber structure is composed of eight circular cladding tubes and two semi-elliptical nested tubes. The transmission performances of terahertz fiber, including birefringence, confinement loss, dispersion and effective mode field area, are studied by changing the parameters of cladding tubes. In the frequency range of 1.75 - 2.6 THz, the broad bandwidth of 850 GHz with high birefringence (above 10-4) can be achieved. The confinement loss of y-polarization mode with the frequency of 2.575 THz can be as low as 0.00231 dB/cm. The waveguide dispersion coefficient is between ±0.188 ps/(THz•cm) in the frequency range of 2.0 - 2.475 THz. The maximum effective mode field area of x- polarization mode is 2.618×10-6 m2 at 2.6 THz.

Single-polarization single-mode hollow-core negative curvature fiber with nested U-type cladding elements

2021 ◽  
Author(s):  
Qiwei Wang ◽  
Shi Qiu ◽  
Jinhui Yuan ◽  
Guiyao Zhou ◽  
Changming Xia ◽  
...  
Keyword(s):  
Negative Curvature ◽  
Extinction Ratio ◽  
Single Mode ◽  
High Order Mode ◽  
Confinement Loss ◽  
Structure Parameters ◽  
Hollow Core ◽  
Propagation Characteristics ◽  
Potential Applications ◽  
Single Polarization

Abstract Hollow-core negative curvature fibers (HC-NCFs) have become one of the research hotspots in the field of optical fiber because of its potential applications in the data and energy transmissions. In this paper, a new kind of single-polarization single-mode HC-NCF with nested U-type cladding elements is proposed. To achieve the single-polarization single-mode transmission, we use two different silica tube thicknesses that satisfy the resonance and anti-resonance conditions on the U-type cladding elements and the cladding tubes, respectively. Besides, the elliptical elements are introduced to achieve good single-mode performance. By studying the influences of the structure parameters on the propagation characteristics, the optimized structure parameters are obtained. The simulation results show that when the wavelength is located at 1550 nm, the single-polarization single-mode transmission is achieved, along with the polarization extinction ratio of 25749 and minimum high-order mode extinction ratio of 174. Furthermore, the confinement loss is only 0.0015 dB/m.

Numerical analysis of photonic crystal fibre with high birefringence and high nonlinearity

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Patrick Atsu Agbemabiese ◽  
Emmanuel Kofi Akowuah
Keyword(s):  
Finite Element Method ◽  
Boundary Condition ◽  
Finite Element ◽  
Photonic Crystal ◽  
Numerical Analysis ◽  
Chromatic Dispersion ◽  
Confinement Loss ◽  
Photonic Crystal Fibre ◽  
High Birefringence ◽  
Air Hole

AbstractA four-ring microstructure photonic crystal fibre with a descending air hole ring cladding is presented. Numerical analysis of the structure is done using full vectorial finite element method with perfectly matched layer (PML) boundary condition. It is demonstrated that it is possible to achieve at 1.55 µm confinement loss of 2.767 × 10−5 dB/m, birefringence of 0.00346 and a nonlinear co-efficient of 41.77 km−1 W−1. Also, chromatic dispersion realised suggests a tuneable zero dispersion at 0.9–1.1 µm wavelength range.

scholarly journals Hollow-Core Negative Curvature Fiber with High Birefringence for Low Refractive Index Sensing Based on Surface Plasmon Resonance Effect

Sensors ◽  
2020 ◽  
Vol 20 (22) ◽  
pp. 6539
Author(s):  
Shi Qiu ◽  
Jinhui Yuan ◽  
Xian Zhou ◽  
Feng Li ◽  
Qiwei Wang ◽  
...  
Keyword(s):  
Negative Curvature ◽  
Resonance Effect ◽  
Confinement Loss ◽  
Hollow Core ◽  
Analysis Method ◽  
High Birefringence ◽  
Surface Plasmon Resonance Effect ◽  
Loss Method ◽  
Gold Wires ◽  
Low Refractive Index

In this paper, a hollow-core negative curvature fiber (HC-NCF) with high birefringence is proposed for low refractive index (RI) sensing based on surface plasmon resonance effect. In the design, the cladding region of the HC-NCF is composed of only one ring of eight silica tubes, and two of them are selectively filled with the gold wires. The influences of the gold wires-filled HC-NCF structure parameters on the propagation characteristic are investigated by the finite element method. Moreover, the sensing performances in the low RI range of 1.20–1.34 are evaluated by the traditional confinement loss method and novel birefringence analysis method, respectively. The simulation results show that for the confinement loss method, the obtained maximum sensitivity, resolution, and figure of merit of the gold wires-filled HC-NCF-based sensor are −5700 nm/RIU, 2.63 × 10−5 RIU, and 317 RIU−1, respectively. For the birefringence analysis method, the obtained maximum sensitivity, resolution, and birefringence of the gold wires-filled HC-NCF-based sensor are −6100 nm/RIU, 2.56 × 10−5 RIU, and 1.72 × 10−3, respectively. It is believed that the proposed gold wires-filled HC-NCF-based low RI sensor has important applications in the fields of biochemistry and medicine.

scholarly journals Design of Photonic Crystal Fiber with Large Mode Area for Flat-top Mode Generation

2021 ◽  
Author(s):  
Zuxing Zhang ◽  
Guangwei Lu ◽  
Shuang Liu ◽  
Dongyu Lv ◽  
Mengmeng Chen
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Imaging Spectroscopy ◽  
Confinement Loss ◽  
Large Mode Area ◽  
Crystal Fiber ◽  
Mode Field ◽  
Potential Applications ◽  
Mode Area ◽  
Mode Generation

Abstract We report a large mode area photonic crystal fiber with a top-hat mode field. The optical fiber has a multi-layer square structure with air holes and doped layer. A flat and top-hat-like mode intensity profile is provided through the reasonable design of the doped layer. The modal characteristics including effective mode area, dispersion and confinement loss are investigated. The proposed fiber with a top-hat mode generation may have potential applications in laser drilling, laser cleaning, imaging, spectroscopy, and so on.

Influence Factors of Confinement Loss of Negative Curvature Hollow Core Fiber

2019 ◽  
Vol 56 (5) ◽  
pp. 050602
Author(s):  
陈翔 Chen Xiang ◽  
胡雄伟 Hu Xiongwei ◽  
李进延 Li Jinyan
Keyword(s):  
Negative Curvature ◽  
Influence Factors ◽  
Confinement Loss ◽  
Hollow Core ◽  
Core Fiber

A Novel Photonic Crystal Fiber with Two Rings of Hybrid Elliptical Air-Holes for Single-Polarization Single-Mode Operation

2011 ◽  
Vol 301-303 ◽  
pp. 45-49
Author(s):  
Hong Jun Zheng ◽  
Chong Qing Wu ◽  
Jian Wang ◽  
Zhi Wang ◽  
Shan Liang Liu ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Single Mode ◽  
Confinement Loss ◽  
Modal Birefringence ◽  
Crystal Fiber ◽  
Mode Field ◽  
Vector Finite Element Method ◽  
Vector Finite Element ◽  
Single Polarization

A novel photonic crystal fiber (PCF) design with two rings of hybrid elliptical air-holes for single-polarization single-mode (SPSM) operation is presented. The proposed SPSM-PCF characteristics are investigated by using a full-vector finite element method (FEM) with perfect matched layer (PML) boundary conditions. The proposed SPSM-PCF can perform a single-polarization single-mode propagation. The modal birefringence of the proposed SPSM-PCF is as high as 0.00284 at the wavelength of 1.55 µm, the beat length is 0.546 mm. The confinement loss of the x-polarized mode is lower than 0.5 dB/km, whereas the loss of the y-polarized one is larger than 15 dB/km. Compared with the case of x-polarized mode, the y-polarized mode can be suppressed with a shorter fiber length. Variations of the mode field characteristics with input wavelength are given. For considering loss ratio and loss difference, the proposed PCF can perform SPSM operation with wide bandwidth of 600 nm. It indicates that this is a good solution to realize single-mode single-polarization operation.

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