ASA 129th Meeting - Washington, DC - 1995 May 30 .. Jun 06

1pEA4. Detection of strain-induced wavelength shifts in an optical fiber Bragg grating using an over-coupled coupler.

Q. Zhang

D. A. Brown

Phys. Dept., Naval Postgraduate School, Monterey, CA 93943

Brown Univ., Providence, RI 02912

H. Kung

J. Townsend

L. Reinhart

T. F. Morse

Brown Univ., Providence, RI 02912

A highly over-coupled fused biconical tapered fiber coupler has been used to interrogate the strain-induced wavelength shifts from an optical fiber Bragg grating. Both the 95% reflective fiber gratings and the over-coupled couplers were fabricated in our laboratory. The coupler has a spectral period of approximately 4 nm at the optical interrogation wavelength of 1550 nm. The outputs are processed using a software-based demodulator programmed in Labview. Results of static and dynamic induced strains and sensor prototypes will be presented. [Work supported in part by NPS and NSF.]