Title :
Accurate Modeling of the Intrinsic Brillouin Linewidth via Finite-Element Analysis
Author :
Dragic, Peter D. ; Ward, Benjamin G.
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Illinois at Urbana-Champaign, Urbana, IL, USA
Abstract :
We present a finite-element analysis of the Brillouin gain spectrum of a highly Ge-doped azimuthally symmetric nonuniform fiber treating the heterogeneous viscosity profile in detail. Measured Stokes´ frequencies and spectral widths for the acoustic modes, and the peak Brillouin gain coefficient are found to be in excellent agreement with the model. An approximate expression for the Brillouin spectral width in azimuthally symmetric, nonuniform fibers is presented and verified for estimating this quantity using simplified boundary-value models.
Keywords :
acoustic wave velocity; boundary-value problems; finite element analysis; optical fibres; stimulated Brillouin scattering; Brillouin gain spectrum; Brillouin spectral width; JkJk:Ge; Stokes frequencies; acoustic modes; acoustic velocity; boundary-value models; finite-element analysis; heterogeneous viscosity profile; highly Ge-doped azimuthally symmetric nonuniform fiber; intrinsic Brillouin linewidth; peak Brillouin gain coefficient; Acoustic measurements; Acoustics; Mathematical model; Optical fibers; Scattering; Semiconductor process modeling; Viscosity; Brillouin scattering; finite-element methods; nonlinearities; optical fibers;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2010.2081974
