DocumentCode :
1377023
Title :
Dependence of Frequency Shift of Depolarized Guided Acoustic Wave Brillouin Scattering in Photonic Crystal Fibers
Author :
McElhenny, John E. ; Pattnaik, Radha K. ; Toulouse, Jean
Author_Institution :
Dept. of Phys., Lehigh Univ., Bethlehem, PA, USA
Volume :
29
Issue :
2
fYear :
2011
Firstpage :
200
Lastpage :
208
Abstract :
We study through experiment, calculation and simulation the frequency dependence of depolarized GAWBS observed in four different photonic crystal fibers and extend the results to others through simulation. In two of the fibers studied, high frequency modes (>; 1 GHz) are observed in addition to the usual lower frequency torsional radial (TR) modes. The acoustic modes responsible for GAWBS are characterized through a combination of simulations and experiments. The calculations are done using the silica rod approximation, which is valid for PCFs with a low to intermediate air-fill fraction or with a very high air-filling fraction. Further simulations extend the range of photonic crystal fibers in which acoustic modes can be characterized. These are used to study the dependence of the acoustic mode frequency on key fiber parameters such as the ratio of air to silica across the whole cross section (κ) and the lattice pitch (Λ) .
Keywords :
Brillouin spectra; acousto-optical effects; holey fibres; photonic crystals; acoustic mode frequency; air-fill fraction; depolarized guided acoustic wave brillouin scattering; frequency shift; lattice pitch; lower frequency torsional radial modes; photonic crystal fibers; Acoustic waves; Approximation methods; Atmospheric modeling; Photonic crystals; Scattering; Silicon compounds; Acoustic; Brillouin; COMSOL; fibers; micro structured fiber; photonic crystal fiber;
fLanguage :
English
Journal_Title :
Lightwave Technology, Journal of
Publisher :
ieee
ISSN :
0733-8724
Type :
jour
DOI :
10.1109/JLT.2010.2091944
Filename :
5634049
Link To Document :
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