title: Wideband 360 degrees microwave photonic phase shifter based on slow light in semiconductor optical amplifiers.
abstract: In this work we demonstrate for the first time, to the best of our knowledge, a continuously tunable 360 degrees microwave phase shifter spanning a microwave bandwidth of several tens of GHz (up to 40 GHz). 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 technology allows an all-integrated device. The microwave operation frequency limitations of the suggested technique, dictated by the underlying physics, are also analyzed.
authors.affiliation: DTU Fotonik, Department of Photonics Engineering, Technical University of Denmark,Build. 343, DK-2800 Kongens Lyngby, Denmark. wexu@fotonik.dtu.dk
authors.forename: Weiqi
authors.initials: W
authors.lastname: Xue
authors.forename: Salvador
authors.initials: S
authors.lastname: Sales
authors.forename: José
authors.initials: J
authors.lastname: Capmany
authors.forename: Jesper
authors.initials: J
authors.lastname: Mørk
mesh_terms: D000669:Amplifiers, Electronic; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008872:Microwaves; D017785:Photons; D012666:Semiconductors