1000 nm tunable acousto-optic filter based on photonic crystal fiber

We report an all-fiber acousto-optic tunable filter based on a two-mode photonic crystal fiber. The properties of photonic crystal fiber allow us to demonstrate a notch filter tunable from below 700 to 1700 nm with a single acoustic transducer. The extreme dynamic range coupled with small insertion loss and fast response time (similar to 100 mu s) makes this device promising for ultrawideband optical systems.