Low-loss criterion and effective area considerations for photonic crystal fibres

Abstract In this article, a low loss circular photonic crystal fiber (C-PCF) has been suggested as Terahertz (THz) waveguide. Both the core and cladding vicinity of the suggested PCF are constituted by circular-shaped air holes. The optical properties such as effective material loss, effective area, core power fraction and V-parameter have numerically been probed by utilizing full vectorial finite element method (FEM) with perfectly matched layers (FMLs) boundary condition. The reported PCF reveals low absorption loss and large effective area of 0.04 cm−1 and 2.80×10−07 m2 respectively at 1 THz operating frequency. In addition, the core power fraction of the fiber is about 50.83 % at the same activation frequency. The V-parameter shows that the proposed PCF acts as a single mode over 0.70 to 1.15 THz frequency. So, the reported PCF offers the best performance in long distance communication applications.

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High birefringence, low loss terahertz photonic crystal fibres with zero dispersion at 0.3 THz

Chinese Physics B ◽

10.1088/1674-1056/20/9/090701 ◽

2011 ◽

Vol 20 (9) ◽

pp. 090701 ◽

Cited By ~ 7

Author(s):

Guo-Bing Yin ◽

Shu-Guang Li ◽

Xiao-Yan Wang ◽

Shuo Liu

Keyword(s):

Photonic Crystal ◽

Low Loss ◽

Photonic Crystal Fibres ◽

High Birefringence

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Extremely Low Loss of Photonic Crystal Fiber for Terahertz Wave Propagation in Optical Communication Applications

Journal of Optical Communications ◽

10.1515/joc-2018-0009 ◽

2020 ◽

Vol 41 (4) ◽

pp. 393-401 ◽

Cited By ~ 9

Author(s):

Fahad Ahmed ◽

Subrata Roy ◽

Bikash Kumar Paul ◽

Kawsar Ahmed ◽

Ali Newaz Bahar

Keyword(s):

Wave Propagation ◽

Photonic Crystal ◽

Photonic Crystal Fiber ◽

Fem Simulation ◽

Effective Area ◽

Low Loss ◽

Material Loss ◽

Scattering Loss ◽

Thz Wave ◽

Crystal Fiber

AbstractAn enormously low loss symmetrical hybrid decagonal porous core spiral photonic crystal fiber (SH-PCF) has been proposed for terahertz (THz) wave guiding. The modal characteristics of the fiber and its mathematical analysis have been numerically completed using a full-vector finite element method (FEM). Simulation results show an ultra-low material loss of 0.0167 cm−1 and large effective area 1.95×106 µm2 which is 91.6 % of bulk absorption material loss at controlling frequency f=1.0 THz with a core porosity 42 %. Additionally, proposed structure establishes the comparatively higher core power fraction maintaining lower scattering loss about 1.8×10−15 dB/cm at the same operating frequency. It promises the aforementioned advantages for efficient THz wave propagation.

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Helically twisted photonic crystal fibres

Philosophical Transactions of The Royal Society A Mathematical Physical and Engineering Sciences ◽

10.1098/rsta.2015.0440 ◽

2017 ◽

Vol 375 (2087) ◽

pp. 20150440 ◽

Cited By ~ 52

Author(s):

P. St.J. Russell ◽

R. Beravat ◽

G. K. L. Wong

Keyword(s):

Angular Momentum ◽

Photonic Crystal ◽

Orbital Angular Momentum ◽

Tight Binding ◽

Fibre Axis ◽

Low Loss ◽

Tight Binding Approximation ◽

New Formalism ◽

Photonic Crystal Fibres ◽

Left And Right

Recent theoretical and experimental work on helically twisted photonic crystal fibres (PCFs) is reviewed. Helical Bloch theory is introduced, including a new formalism based on the tight-binding approximation. It is used to explore and explain a variety of unusual effects that appear in a range of different twisted PCFs, including fibres with a single core and fibres with N cores arranged in a ring around the fibre axis. We discuss a new kind of birefringence that causes the propagation constants of left- and right-spinning optical vortices to be non-degenerate for the same order of orbital angular momentum (OAM). Topological effects, arising from the twisted periodic ‘space’, cause light to spiral around the fibre axis, with fascinating consequences, including the appearance of dips in the transmission spectrum and low loss guidance in coreless PCF. Discussing twisted fibres with a single off-axis core, we report that optical activity in a PCF is opposite in sign to that seen in a step-index fibre. Fabrication techniques are briefly described and emerging applications reviewed. The analytical results of helical Bloch theory are verified by an extensive series of ‘numerical experiments’ based on finite-element solutions of Maxwell's equations in a helicoidal frame. This article is part of the themed issue ‘Optical orbital angular momentum’.

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