Measurement of Underwater Acoustic Field Using Fabry–Perot Interferometer with Chirped Fiber Bragg Gratings

Abstract

A Fabry–Perot interferometer with chirped fiber Bragg gratings (CFBG-FPI) as reflectors has hundreds of resonance peeks in the transmittance spectrum and can be utilized as a sensor based on the dependency of the peak wavelengths on the influence applied to the fiber. Because the width of the peak is narrow, sensitive measurement can be achieved. In addition, one may expect a large dynamic range using multiple peaks. A CFBG-FPI sensor can achieve responsibility as high as a sensor based on a Fabry–Perot interferometer with fiber Bragg gratings and has the option to expand the dynamic range. In this paper, an application of a CFBG-FPI sensor is demonstrated experientially.