PCF Design With Extremely High Nonlinearity And Extremely Negative Dispersion

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.

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A Novel Ultra-Low Loss Rectangle-Based Porous-Core PCF for Efficient THz Waveguidance: Design and Numerical Analysis

Sensors ◽

10.3390/s20226500 ◽

2020 ◽

Vol 20 (22) ◽

pp. 6500

Author(s):

Abdullah Al-Mamun Bulbul ◽

Farjana Imam ◽

Md. Abdul Awal ◽

M. A. Parvez Mahmud

Keyword(s):

Numerical Analysis ◽

Numerical Aperture ◽

Effective Area ◽

Lower Amount ◽

Confinement Loss ◽

Optical Parameters ◽

Material Loss ◽

Crystal Fiber ◽

Porous Core ◽

Standard Values

A novel, rectangle-based, porous-core photonic crystal fiber (PCF) has been modeled for the efficient propagation of a THz wave. The performance of the anticipated model has been assessed using the finite element method (FEM) in the range of 0.5–1.5 THz. Both the fiber core and cladding are modeled with rectangular air holes. Numerical analysis for this model reveals that the model has a lower amount of dispersion of about 0.3251 ps/THz/cm at 1.3 THz. Compared to the other THz waveguides, the model offers an ultra-lower effective material loss of 0.0039 cm−1 at the same frequency. The confinement loss is also lower for this model. Moreover, this model has a high-power fraction of about 64.90% at the core in the x-polarization mode. However, the effective area, birefringence, and numerical aperture have also been evaluated for this model. Maintenance of standard values for all the optical parameters suggests that the proposed PCF can efficiently be applied in multichannel communication and several domains of the THz technology.

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Theoretical Considerations of Photonic Crystal Fiber with All Uniform-Sized Air Holes for Liquid Sensing

Photonics ◽

10.3390/photonics8070249 ◽

2021 ◽

Vol 8 (7) ◽

pp. 249

Author(s):

Abdul Mu’iz Maidi ◽

Pg Emeroylarffion Abas ◽

Pg Iskandar Petra ◽

Shubi Kaijage ◽

Nianyu Zou ◽

...

Keyword(s):

Photonic Crystal ◽

Photonic Crystal Fiber ◽

Nonlinear Coefficient ◽

Numerical Aperture ◽

Relative Sensitivity ◽

Effective Area ◽

Confinement Loss ◽

Crystal Fiber ◽

Sensing Applications ◽

Liquid Sensing

A novel liquid-infiltrated photonic crystal fiber model applicable in liquid sensing for different test liquids—water, ethanol and benzene—has been proposed. One core hole and three air hole rings have been designed and a full vector finite element method has been used for numerical investigation to give the best results in terms of relative sensitivity, confinement loss, power fraction, dispersion, effective area, nonlinear coefficient, numerical aperture and V-Parameter. Specially, the assessed relative sensitivities of the proposed fiber with water, ethanol and benzene are 94.26%, 95.82% and 99.58%, respectively, and low confinement losses of 1.52 × 10−11 dB/m with water, 1.21 × 10−12 dB/m with ethanol and 6.01 × 10−16 dB/m with benzene, at 1.0 μm operating wavelength. This novel PCF design is considered simple and can be easily fabricated for practical use, and the assessed waveguide properties has determined the potential applicability in real liquid sensing applications.

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Ultra high birefringent dispersion flattened fiber in terahertz regime

Journal of Optical Communications ◽

10.1515/joc-2019-0308 ◽

2020 ◽

Vol 0 (0) ◽

Author(s):

Md. Selim Reza ◽

Md. Ahasan Habib ◽

Ibrahim Mustafa Mehedi ◽

Md. Mottahir Alam ◽

Shaikh Abdul Latif

Keyword(s):

Effective Area ◽

Confinement Loss ◽

Thz Radiation ◽

Transmission Characteristics ◽

Material Loss ◽

Crystal Fiber ◽

Porous Core ◽

Bending Loss ◽

Polarization Maintaining ◽

Core Fiber

AbstractIn the current study, a novel Zeonex based porous core photonic crystal fiber (PC-PCF) is presented for polarization-maintaining and dispersion flattened in the terahertz (THz) region. For minimizing the Effective Material Loss (EML), an array of three rectangular and six triangular air holes are surrounded by hexagonal-shaped cladding. Finite Element Method (FEM) is employed through Comsol V5.3a software to design and examine the essential features of the proposed porous core fiber which revealed that it has an extremely small EML of 0.04 cm−1 at 1.2 THz and has almost zero flattened dispersion of 0.8 ± 0.08 ps/THz/cm in 1.0–1.4 THz frequency spectrum. Moreover, the optimum designing parameters offer an extremely high value of birefringence (0.043 at 1.2 THz). Besides, other major features notably bending loss, effective area, and confinement loss are also found to be precise and relatively low. For effective, adaptable and fitting transmission characteristics, this type of design would lay the foundations for broadband THz radiation wide variety of usage in the THz regime.

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Zeonex-based Tetra-rectangular Core-photonic Crystal Fiber for NaCl Detection

Nanoscience &Nanotechnology-Asia ◽

10.2174/2210681210999200708141725 ◽

2020 ◽

Vol 10 ◽

Cited By ~ 2

Author(s):

Abdullah Al-Mamun Bulbul ◽

Md. Bellal Hossain ◽

Rahul Dutta ◽

Mahadi Hassan

Keyword(s):

Photonic Crystal ◽

Photonic Crystal Fiber ◽

Effective Area ◽

Confinement Loss ◽

Polarization Direction ◽

Material Loss ◽

Crystal Fiber ◽

Sensor Model ◽

Proposed Model ◽

Peak Sensitivity

Introduction: This paper demonstrates the design of a sensor model for the detection of Sodium Chloride (NaCl) in an effective and efficient manner. Photonic Crystal Fiber (PCF) has been used to design this sensor model. Objective: Using Comsol Multiphysics software, the sensor model has been implemented and simulated to carry out an indepth analysis of the sensing performance of the proposed model. Method: The confinement loss, effective material loss, effective area, birefringence, and relative sensitivity has been analyzed to estimate the sensing efficiency of this model. The sensor performance has been analyzed for five different concentrations of NaCl. Results: From the analysis, it is found that for all the analytes, confinement loss maintains a moderate value for the frequency band ranging from 0.9 to 1.2 THz. However, it approaches absolute zero immediately after 1.2 THz. The sensor model results in a high effective area, which is highly desirable for every PCF. It shows 3.78 × 105 , 3.77 × 105 , 3.76 × 105 , 3.75 × 105 , and 3.743 × 105 μm 2 effective areas for 0%, 20%, 40%, 60% and 80% NaCl respectively at 1.4 THz. The effective material loss for this model is about 3.7×10-3 , 3.63×10-3 , 3.68×10 -3 , 3.672×10-3 and 3.652×10-3 cm -1 for 80%, 60%, 40%, 20% and 0% NaCl respectively at 1.4 THz. Birefringence is also high for the proposed model . The values of birefringence are approximately 0.002, 0.0018, 0.0017, 0.0016 and 0.0015 at 1.4 THz for 0%, 20%, 40%, 60% and 80% NaCl respectively. In addition to the above positive outcomes, the sensor model exhibits high sensitivity for both x and y polarization. The peak sensitivity of this sensor is 91.5%, 91.42%, 91.34%, 91.25% and 91.10% in x polarization direction whereas the peak sensitivity is 91.70%, 91.60%, 91.49%, 91.40% and 91.25% in y polarization direction for 80%, 60%, 40%, 20% and 0% NaCl respectively at 1.8 THz. The value of sensitivity is above 90% at 1.4 THz for all the five concentrations of NaCl. Conclusion: The analyzed optical properties signify the higher efficiency and effectiveness of the sensor model in the detection of NaCl.

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Design of an Ultrahigh Birefringence Photonic Crystal Fiber with Large Nonlinearity Using All Circular Air Holes for a Fiber-Optic Transmission System

Photonics ◽

10.3390/photonics5030026 ◽

2018 ◽

Vol 5 (3) ◽

pp. 26 ◽

Cited By ~ 10

Author(s):

Shovasis Biswas ◽

S. Islam ◽

Md. Islam ◽

Mohammad Mia ◽

Summit Sayem ◽

...

Keyword(s):

Photonic Crystal ◽

Photonic Crystal Fiber ◽

Nonlinear Coefficient ◽

Excitation Wavelength ◽

Crystal Fiber ◽

Negative Dispersion ◽

High Nonlinearity ◽

Fiber Fabrication ◽

Vector Finite Element ◽

Air Hole

This paper proposes a hexagonal photonic crystal fiber (H-PCF) structure with all circular air holes in order to simultaneously achieve ultrahigh birefringence and high nonlinearity. The H-PCF design consists of an asymmetric core region, where one air hole is a reduced diameter and the air hole in its opposite vertex is omitted. The light-guiding properties of the proposed H-PCF structure were studied using the full-vector finite element method (FEM) with a circular perfectly matched layer (PML). The simulation results showed that the proposed H-PCF exhibits an ultrahigh birefringence of 3.87 × 10−2, a negative dispersion coefficient of −753.2 ps/(nm km), and a nonlinear coefficient of 96.51 W−1 km−1 at an excitation wavelength of 1550 nm. The major advantage of our H-PCF design is that it provides these desirable modal properties without using any non-circular air holes in the core and cladding region, thus making the fiber fabrication process much easier. The ultrahigh birefringence, large negative dispersion, and high nonlinearity of our designed H-PCF make it a very suitable candidate for optical backpropagation applications, which is a scheme for the simultaneous dispersion and nonlinearity compensation of optical-fiber transmission links.

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Low Effective Material Loss TOPAS Based Single-Mode Photonic Crystal Fiber with High Core Power Fraction in the THz Waveguiding

10.21203/rs.3.rs-487498/v1 ◽

2021 ◽

Author(s):

Selim Hossain ◽

Shuvo Sen

Keyword(s):

Photonic Crystal ◽

Photonic Crystal Fiber ◽

Single Mode ◽

Effective Area ◽

Confinement Loss ◽

Long Distance ◽

Material Loss ◽

Scattering Loss ◽

Crystal Fiber ◽

Different Types

Abstract In this study, five layers of hexagonal cladding and two elliptical air holes based on photonic crystal fiber are discussed highly for many communication areas by decreasing different types of losses such as effective material loss (EML), scattering loss, and conﬁnement loss in the terahertz (THz) waveguiding. Our suggested fiber (H-PCF) and all simulation results are obtained with the finite element method (FEM) and the perfectly matched layer (PML) boundary conditions based COMSOL Multiphysics software have been used to design in the THz region. After investigating all the graphical results, this optical communication-related H-PCF fiber discloses an extremely low effective material loss (EML) of 0.0184 cm−1, with an effective area of 7.07×10-8 m2 and flow of power in the core region of 88% at 1 terahertz (THz). Here, other simulation parameters such as conﬁnement loss, scattering loss, and V-parameter are also presented with a proper graph. So, we can easily say that the reported H-PCF fiber is strongly appropriate for different types of short and long-distance communication applications in the terahertz (THz) wave pulse region.

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