Wideband 360° microwave photonic phase shifter based on slow light in semiconductor optical amplifiers

Weiqi Xue, Salvador Sales, José Capmany, Jesper Mørk
2010 Optics Express  
In this work we demonstrate for the first time, to the best of our knowledge, a continuously tunable 360° microwave phase shifter spanning a microwave bandwidth of several tens of GHz (up to 40 GHz) by slow light effects. The proposed device exploits the phenomenon of coherent population oscillations, enhanced by optical filtering, in combination with a regeneration stage realized by four-wave mixing effects. This combination provides scalability: three hybrid stages are demonstrated but the
more » ... hnology allows an all-integrated device. The microwave operation frequency limitations of the suggested technique, dictated by the underlying physics, are also analyzed.
doi:10.1364/oe.18.006156 pmid:20389638 fatcat:z455lflbrbdt7fcbxutgyswke4