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Optical Materials Express

Optical Materials Express

  • Editor: David J. Hagan
  • Vol. 1, Iss. 4 — Aug. 1, 2011
  • pp: 686–699

Acoustic coefficients of P2O5-doped silica fiber: acoustic velocity, acoustic attenuation, and thermo-acoustic coefficient

Pi-Cheng Law, Yuh-Shiuan Liu, André Croteau, and Peter D. Dragic  »View Author Affiliations

Optical Materials Express, Vol. 1, Issue 4, pp. 686-699 (2011)

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We present measurements and modeling of the effect of P2O5 doping on the acoustic damping and temperature sensitivity coefficients of silica fibers. In particular, the Brillouin gain spectrum of a highly P-doped fiber is measured and investigated at different temperatures. It is found that the acoustic damping coefficient (proportional to the Brillouin spectral width) of phosphorus pentoxide (1.41 × 105 m−1 for bulk P2O5 at 11 GHz) is similar to, but larger than, that of germanium dioxide. Additionally, the acoustic velocity (and thereby the Stokes’ shift) is found to be much less dependent on temperature in P2O5 ( + 0.12 m/s/°C) than in SiO2 ( + 0.56 m/s/°C). Using these coefficients (the thermo-acoustic coefficients), the modeled and unique slopes of the Stokes’-shift-versus-temperature curves for the four observed acoustic modes each lie within 3% of the measured values. Finally, utilizing both the thermo-optic and thermo-acoustic coefficients, a design example is presented where a composition is determined for which the dependence of the Brillouin frequency shift on temperature is minimized. In this example, the calculated temperature sensitivity is less than 5 kHz/°C over the temperature range −100 °C < T < 100 °C for the molar composition 0.54P2O5:0.46SiO2.

© 2011 OSA

OCIS Codes
(060.2290) Fiber optics and optical communications : Fiber materials
(060.2300) Fiber optics and optical communications : Fiber measurements
(290.5830) Scattering : Scattering, Brillouin

ToC Category:
Materials for Fiber Optics

Original Manuscript: June 17, 2011
Revised Manuscript: July 15, 2011
Manuscript Accepted: July 16, 2011
Published: July 22, 2011

Pi-Cheng Law, Yuh-Shiuan Liu, André Croteau, and Peter D. Dragic, "Acoustic coefficients of P2O5-doped silica fiber: acoustic velocity, acoustic attenuation, and thermo-acoustic coefficient," Opt. Mater. Express 1, 686-699 (2011)

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