Directional Coupler Based on a Photonic Quasi-Crystal Fiber with Extended Cores

J P Da Silva,Einstein G Dos Santos,Marcos T B Segundo

doi:10.1590/2179-10742018v17i21137

Abstract

Abstract In this paper, an optical coupler composed by a photonic quasi-crystal fiber (PQCF) with two cores is proposed. The structure is obtained by immersion of a quasi-periodic arrangement of air holes replicated twelve-fold in a conventional fiber optical constituted of pure silica. The cores are generated from defects caused due to absence of two air holes on each identical core and horizontally equidistant from the center of PQCF. The chromatic dispersion in each fiber core is ultra-flat around 38.12 ps.nm-1.km-1 and to verify the power transfer, the signal was launched on the left core and transferred to the right core in a propagation length of approximately 3.78 cm.

Highlights

The basic geometry of a photonic quasi-crystal fiber (PQCF) is formed by an arrange of quasiperiodic air holes whose depth extends along the length of the fiber
The PQCF is formed with 12-fold symmetry and values of d = 1.2 m, d/ = 0.5 e = 1.55 μm
The effective modal area refers to the area of the fiber where optical power is effectively transmitted. To obtain this area in the analyzed PQCF, the energy beam was launched into the left core, assuming the right core without defects, the signal was launch into the core 2, considering the left core without defects, the same procedure was adopted to obtain the chromatic dispersion in the cores 1 and 2

Summary

Introduction

The basic geometry of a photonic quasi-crystal fiber (PQCF) is formed by an arrange of quasiperiodic air holes whose depth extends along the length of the fiber. These types of optical fibers, represent a class of structures that exhibit an important feature of do not have translational symmetry, normally found in the traditional photonic crystals (CFs), which are structured materials, where their geometrical functions varies periodically in space [1]. The introduction of symmetries with an aperiodic array of air holes, in a dielectric matrix with low refractive index produces photonic band gaps, i.e., disallowed bands of frequency in which the light propagation is totally banned [3]. The PQCF presents manufacturing configurations that are similar to the processes used in manufacturing the PCF, that is, they are commonly fabricated using pure silica, doped silica or polymeric materials, and the microstructure of the shell is obtained

Methods

Results

Conclusion