title: Enhancing light slow-down in semiconductor optical amplifiers by optical filtering.
abstract: We show that the degree of light-speed control in a semiconductor optical amplifier can be significantly extended by the introduction of optical filtering. We achieve a phase shift of approximately 150 degrees at 19 GHz modulation frequency, corresponding to a several-fold increase of the absolute phase shift as well as the achievable bandwidth. We show good quantitative agreement with numerical simulations, including the effects of population oscillations and four-wave mixing, and provide a simple physical explanation based on an analytical perturbation approach.
authors.affiliation: Department of Photonics Engineering, Technical University of Denmark, Building 343, DK-2800 Kongens Lyngby, Denmark. xue@com.dtu.dk
authors.forename: Weiqi
authors.initials: W
authors.lastname: Xue
authors.forename: Yaohui
authors.initials: Y
authors.lastname: Chen
authors.forename: Filip
authors.initials: F
authors.lastname: Ohman
authors.forename: Salvador
authors.initials: S
authors.lastname: Sales
authors.forename: Jesper
authors.initials: J
authors.lastname: Mørk