Title :
Numerical Analysis of Second Harmonic Generation in Soft Glass Equiangular Spiral Photonic Crystal Fibers
Author :
Wijeratne, I.N.M. ; Kejalakshmy, N. ; Agrawal, A. ; Rahman, B.M.A. ; Grattan, K.T.V.
Author_Institution :
Sch. of Eng. & Math. Sci., City Univ. London, London, UK
fDate :
4/1/2012 12:00:00 AM
Abstract :
In this paper, the accurate and numerically efficient finite element (FE)-based beam propagation method (BPM) has been employed to investigate second harmonic generation (SHG) in highly nonlinear soft glass (SF57) equiangular spiral photonic crystal fibers (ES-PCFs) for the first time. It is shown here that the SHG output power in highly nonlinear SF57 soft glass PCF exploiting the ES design is significantly higher compared with that of silica PCF with hexagonal air-hole arrangements. The effects of fabrication tolerances on the coherence length and the modal properties of ES-PCF are also illustrated. Moreover, phase matching between the fundamental and the second harmonic modes is discussed through the use of the quasi-phase matching technique. Furthermore, the ultralow bending loss in the SF57 ES-PCF design has been successfully analyzed.
Keywords :
bending; finite element analysis; holey fibres; optical design techniques; optical fibre fabrication; optical fibre losses; optical glass; optical harmonic generation; optical phase matching; photonic crystals; coherence length; equiangular spiral photonic crystal fibers; fabrication tolerances; finite element-based beam propagation method; fundamental modes; modal properties; nonlinear soft glass; numerical analysis; quasiphase matching technique; second harmonic generation; second harmonic modes; ultralow bending loss; Finite element methods; Frequency conversion; Glass; Harmonic analysis; Nonlinear optics; Optical fibers; Silicon compounds; Second harmonic generation (SHG); finite element method (FEM); photonic crystal fibers (PCFs);
Journal_Title :
Photonics Journal, IEEE
DOI :
10.1109/JPHOT.2012.2186795
