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

Volume

22

Issue

22

fYear

2010

Firstpage

1698

Lastpage

1700

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;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2010.2081974

Filename

5590281