A comparison of the effect of the ellipticity on the small and large solid-core PCF’s characteristics

Open Physics ◽  
2014 ◽  
Vol 12 (9) ◽  
Author(s):  
Halime Inci ◽  
Sedat Ozsoy
Keyword(s):  
Hexagonal Lattice ◽  
Numerical Aperture ◽  
Simulation Software ◽  
Confinement Loss ◽  
Solid Core ◽  
Large Core ◽  
Small Core ◽  
Crucial Effect ◽  
Circular Holes ◽  
Air Hole

AbstractIn this paper we study small and large solid-core PCFs with elliptical shaped air-holes for the hexagonal lattice, which were constructed by omitting one air-hole (small core) and seven air-holes (large core), respectively, and we compare their characteristics with those with circular holes. We use two types of ellipticity: vertical and horizontal. Birefringence, dispersion, and the numerical apertures of the fundamental modes are analyzed using commercial simulation software. Also, the confinement loss is obtained. The effect of ellipticity on these characteristics is investigated in detail. It is found that the type of ellipticity of the air holes affects the numerical aperture and hence confinement loss significantly, but it has no crucial effect on either the dispersion or the birefringence for the small and large core PCFs.

scholarly journals Manifestation of propagation traits for polymer square lattice micro-structured optical fiber in THz regime: a simplified model

2021 ◽  
Author(s):  
Hukam Singh ◽  
Dinesh Kumar Sharma ◽  
Saurabh Mani Tripathi
Keyword(s):  
Optical Fiber ◽  
Numerical Aperture ◽  
Relative Sensitivity ◽  
Sensitivity Coefficient ◽  
Spot Size ◽  
Square Lattice ◽  
Confinement Loss ◽  
Design Parameters ◽  
Solid Core ◽  
Material Loss

Abstract To sustain the pace with immense prominence, interest in low-loss terahertz (THz) waveguides increases due to their particular applications in the multidisciplinary arena. This paper narrates a novel solid-core polymer-based square lattice micro-structured optical fiber (SL-MOF) with circular air-holes for efficient propagation of THz waves. The anticipated model’s guiding attributes are described by employing the numerically efficient finite-element method (FEM) in conjunction with an auxiliary Ring Model. Numerical analysis of the model exhibits confinement loss of about ~ 10 -7 dB/cm and low effective material loss of ~ 0.19 cm -1 at the applied frequency of 1.0 THz. It is also demonstrated that the considered geometry furnishes low bending loss over the extended range of THz frequency. The relative sensitivity coefficient is evaluated in context for the targeted design parameters to enable the said model’s practical utility. Other nameworthy propagation characteristics, such as effective mode-index, power fraction, effective mode-area, numerical aperture, spot-size, and the beam divergence are also investigated. The improved outcomes are anticipated that the proposed configuration will be opened a new epoch in the THz waveband.

scholarly journals PCF Design With Extremely High Nonlinearity And Extremely Negative Dispersion

2021 ◽  
Author(s):  
Sanat Kumar Pandey ◽  
J.B. Maurya ◽  
Yogendra Kumar Prajapati
Keyword(s):  
Numerical Aperture ◽  
Effective Area ◽  
Confinement Loss ◽  
Performance Parameters ◽  
Material Loss ◽  
Crystal Fiber ◽  
Negative Dispersion ◽  
High Nonlinearity ◽  
Very High ◽  
Air Hole

Abstract In this manuscript we designed a circular photonic crystal fiber (PCF) having three rectangular holes filled with GaP in the core region, three air hole rings and one annular air ring in cladding region. We found highest negative dispersion for the 1.8µm pitch alongwith very low confinement loss at wavelength 1.55µm. This designed PCF offers high nonlinearity (39612 W-1km-1) and high negative dispersion (-6586 ps nm-1 km-1) alongwith zero confinement loss at 1.55µm wavelength. We also compared the proposed PCF with the previously published PCF structure and found that the nonlinearity and negative dispersion of the designed PCF are very high in comparison to circular air hole based PCF. Another performance parameters viz. birefringence, numerical aperture, effective area and effective material loss are also analyzed.

scholarly journals Design of Honeycomb Shaped Spectroscopy based Biosensor for the Detection of Tuberculosis Cells

2021 ◽  
Author(s):  
Tarunnum Parvin ◽  
M S Zobaer ◽  
Kawsar Ahmed ◽  
Francis Minhthang Bui ◽  
Sumaiya Akhtar Mitu ◽  
...  
Keyword(s):  
Hexagonal Lattice ◽  
Numerical Aperture ◽  
High Sensitivity ◽  
Effective Area ◽  
Spot Size ◽  
Confinement Loss ◽  
Optical Parameters ◽  
Circular Shape ◽  
Vector Finite Element ◽  
Background Material

Abstract A novel compact honeycomb spectroscopic-based PCF sensor for the detection of tuberculosis cells is proposed. A circular shape core area and tightly bound hexagonal shape air holes in the cladding area are designed for the suggested structure that exhibits ultra-high sensitivity up to 99.99% and very low loss of order 10-11 dB/m. The optical parameters such as effective area (Aeff), V-parameter or normalized frequency (Veff), spot- size (Weff), numerical aperture, along quality factor of beam have been exhibited and numerically observed. The wavelength operating region is specified as 1.2 μm to 2.5 μm. The guiding properties of this suggested tuberculosis sensor is computed with the full vector finite element method (FV-FEM) in the environment of COMSOL Multiphysics (Version5.3) for the calculation of numerical analysis. Circular shape perfectly matched layer (PML) and hexagonal lattice PCF sensor using silica as a background material is successfully designed to increase the sensitivity response compare to the prior works. Moreover, during the entire operating wavelength presented sensor achieves a single modality. With excellent sensitivity response and very low confinement loss, this proposed sensor doubtfully proves its prominent role to detect tuberculosis cells.

scholarly journals Efficient Photonic Crystal Fiber Design for Higher OAM Modes with Low Loss Towards Next Generation THz Communication

2021 ◽  
Author(s):  
Bibhatsu Kuiri ◽  
Bubai Dutta ◽  
Nilanjana Sarkar ◽  
Saikat Santra ◽  
Paulomi Mandal ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Confinement Loss ◽  
Solid Core ◽  
Low Loss ◽  
Crystal Fiber ◽  
Fiber Design ◽  
Effective Mode Area ◽  
Mode Purity ◽  
Mode Area

Abstract A newer and efficient solid core with air holes and ring based circular photonic crystal fiber (C-PCF) design is proposed, developed, and studied. The C-PCF structure with a ring core and three layers of air holes is developed to communicate terahertz frequency of the range of 1 THz to 3 THz. Finite element method (FEM) is used to optimize the position, shape and dimensions of air holes and refractive index (RI) of material for the proposed PCF design and check the efficiency to support different orbital angular momentum (OAM) modes for communication. Our novel designed C-PCF supports multiple stable modes with mode purity above 0.9. Confinement loss is in the range of 10-12 dB/cm, highest effective mode area in the order of 1 mm2 is achieved in the investigated study for 3 THz transmission. The study observes that the performance of PCF is strongly dependent on RI of core and cladding.

scholarly journals Small-core photonic crystal fibres with weakly disordered air-hole claddings

2003 ◽  
Vol 6 (2) ◽  
pp. 221-223 ◽  
Author(s):  
Niels Asger Mortensen ◽  
Martin D Nielsen ◽  
Jacob Riis Folkenberg ◽  
Kim P Hansen ◽  
Jesper Lægsgaard
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fibres ◽  
Small Core ◽  
Air Hole

High birefringent, low loss and flattened dispersion asymmetric slotted core-based photonic crystal fiber in THz regime

2019 ◽  
Vol 33 (20) ◽  
pp. 1950218 ◽  
Author(s):  
Md. Khairum Monir ◽  
Mahmudul Hasan ◽  
Bikash Kumar Paul ◽  
Kawsar Ahmed ◽  
Hala J. El-Khozondar ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Real Life ◽  
Simulation Software ◽  
Confinement Loss ◽  
Low Loss ◽  
Material Loss ◽  
Scattering Loss ◽  
High Birefringence ◽  
Crystal Fiber

This paper proposes a novel model to attain high birefringence and low loss in a slotted core-based photonic crystal fiber (PCF) structure in THz regime. The performance of the proposed PCF has been evaluated by applying finite element method (FEM) with full simulation software COMSOL Multiphysics V-5.1. The proposed model gains good optical properties such as high birefringence of 0.24, low effective material loss (EML) of 0.03 cm[Formula: see text], low confinement loss of 6.5 × 10[Formula: see text] (dB/m), low scattering loss of 2 × 10[Formula: see text] (dB/m) and low bending loss of 7.4 × 10[Formula: see text] (dB/cm). The proposed structure also exhibits the flattened dispersion for wider frequency response. However, the real-life fabrication of the suggested model is highly feasible using the current technology due to the unique shape of circular air holes in the cladding region. The outcomes make the proposed PCF a stronger candidate for polarization-preserving applications such as sensing, communications and filtering operations in THz band.

High numerical aperture large-core photonic crystal fiber for a broadband infrared transmission

2016 ◽  
Vol 79 ◽  
pp. 10-16 ◽  
Author(s):  
J. Pniewski ◽  
G. Stepniewski ◽  
R. Kasztelanic ◽  
B. Siwicki ◽  
D. Pierscinska ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Numerical Aperture ◽  
Infrared Transmission ◽  
Large Core ◽  
High Numerical Aperture ◽  
Crystal Fiber

High Birefringence Photonic Crystal Fibers

2010 ◽  
Vol 663-665 ◽  
pp. 713-716
Author(s):  
Shu Qin Guo ◽  
Min Ge ◽  
Pan Zhuang ◽  
Li Ping Chang
Keyword(s):  
Photonic Crystal ◽  
Solid Core ◽  
Crystal Fiber ◽  
The Core ◽  
Crystal Fibers ◽  
Section Structure ◽  
General Section ◽  
Birefringence Effect ◽  
Modal Field ◽  
Air Hole

Photonic crystal fiber (PCFs) offer new possibilities of realizing highly birefringence fibers due to a higher intrinsic index contrast compared to conventional fibers. Here, based on general section structure of PCFs, we take some mend in the core configuration, and achieve highly birefringence effect. A elliptic air hole and its inscribed circular high refractive material form the core of PCFs together. Especially to mention, they are being tangent at two points. By optimally selecting parameters, the effective refractive index difference between two orthogonal directions neff can reach the magnitude of 10-2. After numerical calculation, we find that increase the size of circular solid core, or long axe size of elliptic air hole, birefringence parameter of modal field can become more highly. Moreover, by matching structure parameters appropriately, the modal field diameters can be equivalent in the two orthogonal directions. A Gaussian modal field with highly birefringence character can be acquired.

Highly efficient OADM using mode gap with hexagonal lattice air-hole PC slab waveguides

2006 ◽  
Author(s):  
Akiko Gomyo ◽  
Jun Ushida ◽  
Tao Chu ◽  
Hirohito Yamada ◽  
Satomi Ishida ◽  
...  
Keyword(s):  
Hexagonal Lattice ◽  
Slab Waveguides ◽  
Highly Efficient ◽  
Air Hole
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