Fiber Bragg grating sensor interrogation using chirped fiber grating-based Sagnac loop

We have investigated numerically and experimentally a fiber Bragg grating (FBG) sensor interrogation scheme utilizing a linear chirped grating-based Sagnac loop as a wavelength-dependent receiver. The scheme is suitable for both static and dynamic sensor interrogation with advantages of stable and linear readout response and easily-adjustable sensing resolution and dynamic range. Static and dynamic strain resolutions as high as /spl plusmn/ 4.2 /spl mu//spl epsiv/ and 0.406 /spl mu//spl epsiv///spl radic/ Hz have been demonstrated using this scheme.

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