A tunable Fabry-Perot filter based on InP/air Bragg mirrors has been studie
d. We have measured a resonance linewidth of 0.6 nm and a tuning range of 6
2 nm. The linewidth is kept below 1 nm over a 40 nm tuning range. The relat
ion between the bending of the suspended layers during the actuation and th
e optical properties of the filter are analysed.