Table of Contents
ISRN Optics
Volume 2013 (2013), Article ID 986924, 9 pages
http://dx.doi.org/10.1155/2013/986924
Research Article

Circular Photonic Crystal Fibers: Numerical Analysis of Chromatic Dispersion and Losses

Department of Physics and Meteorology, Indian Institute of Technology, Kharagpur 721302, India

Received 8 August 2013; Accepted 10 September 2013

Academic Editors: G. Bellanca, M. D. Hoogerland, Y. S. Kivshar, and G. S. Maciel

Copyright © 2013 Partha Sona Maji and Partha Roy Chaudhuri. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Detailed numerical analysis for dispersion properties and losses has been carried out for a new type of Photonic crystal fiber where the air-holes are arranged in a circular pattern with a silica matrix called as Circular Photonic Crystal Fiber (C-PCF). The dependence of different PCF geometrical parameters namely different circular spacings, air-hole diameter and numbers of air-hole rings are carried out in detail towards practical applications. Our numerical analysis establishes that total dispersion is strongly affected by the interplay between material dispersion and waveguide dispersion. For smaller air-filing fraction, adding extra air-hole rings does not change dispersion much whereas for higher air-filling fraction, the dispersion nature changes significantly. With proper adjustment of the parameters ultra-flattened dispersion could be achieved; though the application can be limited by higher losses. However, the ultra-flat dispersion fibers can be used for practical high power applications like supercontinuum generation (SCG) by reducing the loss at the pumping wavelength by increasing the no of air-hole rings. Broadband smooth SCG can also be achieved with low loss oscillating near-zero dispersion fiber with higher no of air-hole rings. The detail study shows that for realistic dispersion engineering we need to be careful for both loss and dispersion.