Design of highly birefringent holey fibers with near-zero ultra-flattened chromatic dispersion and ultralow confinement loss

M Samiul Habib,M A Goffar Khan,M Selim Habib,Y Namihira,M A Hossain,S M A Razzak

doi:10.1590/s2179-10742013000100009

Abstract

We present a holey fiber (HF) with elliptical air-holes located in the center core area that ensures high birefringence, near-zero ultra-flattened chromatic dispersion and very low confinement losses in a wide wavelength range. The finite element method with perfectly matched boundary layer is used to investigate the guiding properties. It is demonstrated that it is possible to design a low-loss dispersion-flattened HF with a high birefringence of 0.0033 at a 1.55 µm wavelength. According to simulation, near-zero ultra-flattened dispersion of 0 ± 0.5 ps/nm/km is obtained in a 1.25 to 1.65 µm wavelength range with low confinement losses of 0.0008 dB/km in the entire band of interest.

Highlights

Index guiding photonic crystal fibers (PCFs) or holey fibers [1] usually consist of a hexagonal arrangement of microscopic air-channels running down the length of the silica based fiber surrounding a central solid silica core
We have proposed a birefringent holey fiber (HF), comprising of hexagonal lattice of air holes, where four elliptical air-holes are inserted in the center core area
Mode is more confined in the core region than at longer wavelengths, and the chromatic dispersion is directly affected from the inner air-hole ring and the air hole arrangements and from the outer ring air hole sizes and hole-to-hole spacing Λ

Summary

Introduction

Index guiding photonic crystal fibers (PCFs) or holey fibers [1] usually consist of a hexagonal arrangement of microscopic air-channels running down the length of the silica based fiber surrounding a central solid silica core. Holey fibers (HFs) guide the light via one of two mechanisms: effective-index guidance and photonic-bandgap (PBG) guidance. In the HFs with effective-index mechanism, the light is guided based on the total internal reflection between a solid core and a cladding region with multiple air-holes [1]. Holey fibers have drawn increased attention nowadays because of many of their attractive properties [4]; for example, very high or very low nonlinearity, wideband dispersion-flattened characteristics, high birefringence, endlessly single mode guiding, and many others. We have proposed a birefringent HFs, comprising of hexagonal lattice of air holes, where four elliptical air-holes are inserted in the center core area

Methods

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Conclusion