Bragg grating fast tunable filter for wavelength division multiplexing

A Bragg grating fast tunable filter prototype working over a linear tuning range of 45 nm with a maximum tuning speed of 21 nm/ms has been realized. T he tunable filter system is based on two piezoelectric stack actuators movi ng a mechanical device thus compressing an apodized fiber Bragg grating. Th e filter allows both traction and compression and can work in transmission and in reflection, It is designed to work with a channel spacing of 100 GHz according to the ITU specifications for wavelength division multiplexing s ystems.