The Acoustic Velocity of Ge‐Doped Silica Fibers: A Comparison of Two Models

Two models are compared with measured data for the longitudinal acoustic velocity of Ge-doped silica fibers as a function of GeO2 content in order to determine if either of them can be used in designing the acoustic velocity profile of an optical fiber. These are the Makishima–Mackenzie and additive (AD) models. Both models are found to fit measured data very well in the available test samples, and as a result both models offer a means to accurately design doping profiles for a number of Brillouin scattering applications. The major difference between these models lies in the slope of the curve between pure silica and pure GeO2 acoustic velocity values, the latter of which lies outside the range of our experimental data (<40 mol% GeO2 in silica). The AD model is also shown to fit the Sellemeier equation very well.

[1]  John Kieffer,et al.  Extended structural integrity in network glasses and liquids , 1997 .

[2]  Andrew D. Yablon.  Multi-Wavelength Optical Fiber Refractive Index Profiling by Spatially Resolved Fourier Transform Spectroscopy , 2010 .

[3]  Peter D. Dragic.  Brillouin spectroscopy of Nd–Ge co-doped silica fibers , 2009 .

[4]  Kaoru Shimizu,et al.  Measurement of distributed strain and temperature in a branched optical fiber network by using Brillouin optical time domain reflectometry (OTDR) , 1994, Other Conferences.

[5]  J. Mackenzie,et al.  Direct calculation of Young's moidulus of glass , 1973 .

[6]  C. R. Hammond,et al.  Silica based binary glass systems — refractive index behaviour and composition in optical fibres , 1977 .

[7]  J. Mackenzie,et al.  Calculation of bulk modulus, shear modulus and Poisson's ratio of glass , 1975 .

[8]  L. Maksimov,et al.  Physical consequences of inhomogeneous glass structure from scattered light spectroscopy data , 1990 .

[9]  J. Rocherullé,et al.  Elastic moduli of oxynitride glasses: Extension of Makishima and Mackenzie's theory , 1989 .

[10]  J. Fleming,et al.  Dispersion in GeO 2 –SiO 2 glasses , 1984 .

[11]  Alain Shang,et al.  Acoustic Characterization of Silica Glasses , 1993 .

[12]  D. Jackson,et al.  Potential of stimulated Brillouin scattering as sensing mechanism for distributed temperature sensors , 1989 .

[13]  L. Hwa,et al.  Velocity of sound and elastic properties of lanthanum gallo-germanate glasses , 2005 .

[14]  Peter D. Dragic.  Novel dual-Brillouin-frequency optical fiber for distributed temperature sensing , 2009, LASE.

[15]  M. Ferrari,et al.  Origin of Rayleigh scattering and anomaly of elastic properties in vitreous and molten GeO2 , 2008 .

[16]  G. Stegeman,et al.  Normal acoustic modes and Brillouin scattering in single-mode optical fibers , 1979 .

[17]  R. Smith.  Optical power handling capacity of low loss optical fibers as determined by stimulated Raman and brillouin scattering. , 1972, Applied optics.

[18]  Alan E. Willner,et al.  Broadband SBS Slow Light in an Optical Fiber , 2007, OFC 2007.

[19]  M. Shoaib,et al.  Elastic moduli prediction and correlation in SiO2-based glasses , 1998 .

[20]  S Sakaguchi,et al.  Optical properties of GeO2 glass and optical fibers. , 1997, Applied optics.