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Radial Bragg Grating Package for Temperature Compensation in Interferometric Hydrophone Arrays

Published online by Cambridge University Press:  15 February 2011

L.G. Carreiro ,
G.H. Ames ,
T.S. Ramotowski  and
P.D. Curry
L.G. Carreiro
Affiliation:
Naval Undersea Warfare Center, Newport, RI 02841
G.H. Ames
Affiliation:
Naval Undersea Warfare Center, Newport, RI 02841
T.S. Ramotowski
Affiliation:
Naval Undersea Warfare Center, Newport, RI 02841
P.D. Curry
Affiliation:
Naval Undersea Warfare Center, Newport, RI 02841
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Abstract

A new method of packaging fiber Bragg gratings to stabilize their wavelength over temperature variations was developed using a grating mount fabricated from zirconium tungstate (ZrW2O8), a ceramic with a negative coefficient of thermal expansion (CTE). The principle of operation is based on the differences in CTE of the Bragg grating and grating mount, with the mount serving as a compensator for the thermo-optic effects of the fiber. As the temperature is elevated, the refractive index of the grating increases, shifting the reflection wavelength to longer wavelength. At the same time the ceramic grating mount contracts relieving some of the tension on the grating, causing a shift to shorter wavelength. Since these two effects offset each other, the thermal wavelength shift of the grating can be minimized or even eliminated. In addition to a description of the temperature-compensating device, the properties of zirconium tungstate are briefly discussed with emphasis on the processing of the ceramic grating mount. Thermal analysis data is given for zirconium tungstate with 5% polymer binder addition.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 604: Symposium LL – Materials for Smart Systems III , 1999 , 191
Copyright
Copyright © Materials Research Society 2000

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