Dynamic control of a phase-shifted FBG through acousto-optic modulation

When an acoustic wave excites a phase-shifted fiber Bragg grating (PSFBG) several properties of the transmission/reflection spectrum, such as transmission notch depth and spectral bandwidth are influenced. In this work, a study on the effect of acoustic waves in PSFBGs is presented. The results are supported by theoretical simulation and experimental work. The technique can be used for different applications, such as in a fast tunable optical notch filter. ► We study the properties of a PSFBG under the influence of acousto-optic effect. ► This allows a fine tuning of the notch depth and bandwidth until its suppression. ► The obtained results can be used in the development of fine tuned optical filters. ► We obtain fast response times of the device using very low power source. ► The method allows for an actively tunable cavity Q, with potential applications.