Enhancing light slow-down in semiconductor optical amplifiers by optical filtering.
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.
Xue
Weiqi
W
Department of Photonics Engineering, Technical University of Denmark, Building 343, DK-2800 Kongens Lyngby, Denmark. xue@com.dtu.dk
Chen
Yaohui
Y
Ohman
Filip
F
Sales
Salvador
S
Mørk
Jesper
J