A Single-Polarization Single-Mode Photonic Crystal Fiber with Four Lines of Small Elliptical Air-Holes

2011 ◽  
Vol 301-303 ◽  
pp. 50-54
Author(s):  
Hong Jun Zheng ◽  
Chong Qing Wu ◽  
Zhi Wang ◽  
Jian Wang ◽  
Shan Liang Liu ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Single Mode ◽  
Confinement Loss ◽  
Crystal Fiber ◽  
Vector Finite Element Method ◽  
Vector Finite Element ◽  
Perfect Matched Layer ◽  
Single Polarization ◽  
Full Vector

We present a novel single-polarization single-mode photonic crystal fiber (SPSM-PCF) design with four lines of small elliptical air-holes in order to obtain wider bandwidth for SPSM operation. The characteristics of the proposed SPSM-PCF are studied by using a full-vector finite element method (FEM) with perfect matched layer (PML) boundary conditions. At the wavelength of 1.55 µm, the confinement loss of the x-polarized mode is lower than 0.5 dB/km, whereas the loss of the y-polarized mode is larger than 50 dB/km. Compared with the case of x-polarized mode, the y-polarized mode can be suppressed in the PCF. Then, the SPSM operation is obtained. The proposed PCF can perform SPSM operation with broadband of 600 nm for considering the confinement loss ratio and the loss difference.

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.

Design of broadband single-polarization filter based on simple structure photonic crystal fiber with gold-coated air holes

2021 ◽  
pp. 2150473
Author(s):  
Sinuo An ◽  
Chunjie Hu ◽  
Lei Zhou ◽  
Zao Yi ◽  
Chao Liu ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Simple Structure ◽  
Structure Design ◽  
Characteristic Parameters ◽  
Polarization Filter ◽  
Crystal Fiber ◽  
Vector Finite Element Method ◽  
Vector Finite Element ◽  
Single Polarization

A polarization filter based on simple structure photonic crystal fiber (PCF) coated with gold air holes is designed in this work. The full vector finite element method (FEM) is used to calculate the characteristic parameters of PCF. In the final numerical simulation results, the loss peak in the [Formula: see text] polarization direction is 2305.72 dB/cm and the [Formula: see text]-polarized loss is as low as 75.86 dB/cm at 1.31 [Formula: see text]m. For the fiber length of 1000 [Formula: see text]m, the CT reaches 1936.83 dB and a wide bandwidth greater than 20 dB can provide above 800 nm. The content of this paper can provide a new idea for filter structure design.

A Novel High-Birefringent Photonic Crystal Fiber and its Polarization Maintaining Properties

2013 ◽  
Vol 760-762 ◽  
pp. 185-189
Author(s):  
Jian Hui Zeng ◽  
Xu You Li ◽  
Wen Bin Hu
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Theoretical Method ◽  
High Birefringence ◽  
Crystal Fiber ◽  
Vector Finite Element Method ◽  
Vector Finite Element ◽  
Polarization Maintaining ◽  
Modal Field ◽  
Full Vector

A novel high-birefringent photonic crystal fiber (PCF) was proposed and analyzed by full-vector finite element method (FEM). The modal field and birefringence properties were investigated. All of air holes in proposed PCF are round, and their diameters are the same. It is greatly reduce the difficulty of fabrication. According to the results of numerical analysis, it can be observed that the mode birefringence of this novel PCF can be easily achieve the order of 10-3at 1.55μm. This research provides effective theoretical method for the fabrication, development and construction of high-birefringence photonic crystal fiber.

Theoretical Assessment of a Porous Core Photonic Crystal Fiber for Terahertz Wave Propagation

2018 ◽  
Vol 0 (0) ◽  
Author(s):  
Izaddeen Kabir Yakasai ◽  
Atta Rahman ◽  
Pg Emeroylariffion Abas ◽  
Feroza Begum
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Bulk Material ◽  
Single Mode ◽  
Confinement Loss ◽  
Design Parameters ◽  
Terahertz Waves ◽  
Material Loss ◽  
Crystal Fiber ◽  
Porous Core

AbstractA porous core photonic crystal fiber (PCF) for transmitting terahertz waves is reported and characterized using finite element method. It is shown that by enveloping an octagonal core consisting of only circular air holes in a hexagonal cladding, it is possible to attain low effective material loss that is 73.8% lower than the bulk material absorption loss at 1.0 THz operating frequency. Moreover, a low confinement loss of 7.53×10–5 cm−1 and dispersion profile of 1.0823±0.06 ps/THz/cm within 0.7–1 THz are obtained using carefully selected geometrical design parameters. Other guiding properties such as single-mode operation, bending loss, and effective area are also investigated. The structural design of this porous core PCF is comparatively simple since it contains noncomplex lattices and circular shaped air holes; and therefore, may be implemented using existing fabrication techniques. Due to its auspicious guiding properties, the proposed fiber may be used in single mode terahertz imaging and other short distance terahertz applications.

Design and Characterization of an Ultra Low Loss, Dispersion-Flattened Slotted Photonic Crystal Fiber for Terahertz Application

2018 ◽  
Vol 0 (0) ◽  
Author(s):  
Mohammad Rakibul Islam ◽  
Md. Arif Hossain ◽  
Syed Iftekhar Ali ◽  
Jakeya Sultana ◽  
Md. Saiful Islam
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Single Mode ◽  
Confinement Loss ◽  
Terahertz Frequency ◽  
Frequency Range ◽  
Low Loss ◽  
Material Loss ◽  
Crystal Fiber

AbstractA novel photonic crystal fiber (PCF) based on TOPAS, consisting only rectangular slots is presented and analyzed in this paper. The PCF promises not only an extremely low effective material loss (EML) but also a flattened dispersion over a broad frequency range. The modal characteristics of the proposed fiber have been thoroughly investigated using finite element method. The fiber confirms a low EML of 0.009 to 0.01 cm−1 in the frequency range of 0.77–1.05 THz and a flattened dispersion of 0.22±0.01 ps/THz/cm. Besides, some other significant characteristics like birefringence, single mode operation and confinement loss have also been inspected. The simplicity of the fiber makes it easily realizable using the existing fabrication technologies. Thus it is anticipated that the new fiber has the potential to ensure polarization preserving transmission of terahertz signals and to serve as an efficient medium in the terahertz frequency range.

A photonic crystal fiber for single-polarization single-mode operation

2011 ◽  
Author(s):  
Hongjun Zheng ◽  
Chongqing Wu ◽  
Zhi Wang ◽  
Shanliang Liu ◽  
Huishan Yu ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Single Mode ◽  
Single Mode Operation ◽  
Crystal Fiber ◽  
Mode Operation ◽  
Single Polarization
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