FIBER-CHIRPED GRATING FABRY-PEROT SENSOR WITH MULTIPLE-WAVELENGTH-ADDRESSABLE FREE-SPECTRAL RANGES

We report the demonstration of a fiber-chirped grating Fabry-Perot (FP ) sensor with large dynamic range and high resolution surpassing that of a conventional PP sensor, The chirped grating FP sensor functions a s an array of collocated FP cavities with different wavelength address able cavity lengths or free-spectral ranges, This sensor design allows large dynamic range and high resolution to be achieved in a single co mpact sensor head. Free-spectral range from 0.04 to 1.3 nm has been ac hieved, Using this device as a strain sensor, unambiguous (without fri nge counting) strain measurements from 3 +/- 1 mu Strain (limited by p robe source resolution) to 1300 mu Strain have been measured.