A new circular photonic crystal fiber for effective dispersion compensation over E to L wavelength bands

M M Haque,M S Rahman,S M A Razzak,M Samiul Habib,M Selim Habib

doi:10.1590/s2179-10742013000200004

Abstract

This paper presents a new circular photonic crystal fiber (C-PCF) for effective dispersion compensation covering E to L wavelength bands ranging from 1360-1625 nm. To investigate its guiding properties, finite element method (FEM) with a perfectly matched layer absorbing boundary condition is used. From our numerical simulation, it is found that the designed C-PCF simultaneously shows a large negative dispersion of about -248.65 to -1069 ps/(nm.km) over E to L wavelength bands and a relative dispersion slope (RDS) exactly equal to that of a single mode fiber (SMF) at 1.55 µm wavelength. It is also found that residual dispersion after compesating 40 km long SMF is within ±62 ps/nm which ensures application of C-PCF in high speed WDM system. Besides, dispersion slope, slope compensation ratio, effective area and confinement loss of the proposed C-PCF are also evaluated and discussed.

Highlights

In fiber optic communication systems, dispersion limits the maximum transmission distance and the bit rate [1]
High negative dispersion of dispersion compensating fibers (DCFs) is needed to be achieved over a wide range of wavelength so that it can be used in broadband communication system
Photonic crystal fibers (PCFs) or holey fibers or microstructured optical fibers consists of a microscopic array of air channels running down their length that make a low index cladding around the undoped silica core [10] have gained attentions in the field of dispersion

Summary

INTRODUCTION

In fiber optic communication systems, dispersion limits the maximum transmission distance and the bit rate [1]. PCF for broadband dispersion compensation of SMF have been proposed [15, 23] using five air-hole rings. PCF with hexagonal structure in [23] shows perfect RDS matching with SMF but exhibits insufficient negative dispersion of -130 to -360 ps/(nm.km) in a 1.30-1.60 μm wavelength range which will increase the length of designed DCF. We report a new circular photonic crystal fiber using five air-hole rings which simultaneously gives high negative dispersion over a wide range of wavelength as well as perfectly matched RDS with that of SMF using FEM. Chromatic dispersion, D( ) confinement loss, Lc and effective area, Aeff of the proposed C-PCF can be calculated with the following equations [12, 23]. The effective area Aeff in μm is calculated by the following equation where E is the electric field vector in the medium

REQUIREMENT FOR DISPERSION AND DISPERSION SLOPE COMPENSATION

VIII. CONCLUSION