Abstract

Fiber Bragg gratings are now widely used for signal processing. The basic component is a grating reflecting energy at a given wavelength. Some applications require the use of tunable gratings. A simple mean is to apply a strain on the fiber. Piezoelectric actuators are well suited for this application. The use of piezo strips has already been reported to induce a different phase shift between the two arms of a fiber Mach-Zehn- der interferometer (Ref. 1). We have recently reported on a tunable fiber-optic delay line working at one wavelength where the delay was controlled by shifting the resonance wavelength of Bragg gratings by the means of PZT ring actuators (Ref. 2).

© 1996 Optical Society of America