title: Greatly enhanced slow and fast light in chirped pulse semiconductor optical amplifiers: theory and experiments.
abstract: Chirped pulse scheme is shown to be highly effective to attain large tunable time shifts via slow and fast light for an ultra-short pulse through a semiconductor optical amplifier (SOA). We show for the first time that advance can be turned into delay by simply reversing the sign of the chirp. A large continuously tunable advance-bandwidth product (ABP) of 4.7 and delay-bandwidth product (DBP) of 4.0 are achieved for a negatively and positively chirped pulse in the same device, respectively. We show that the tunable time shift is a direct result of self-phase modulation (SPM). Theoretical simulation agrees well with experimental results. Further, our simulation results show that by proper optimization of the SOA and chirper design, a large continuously tunable DBP of 55 can be achieved.
authors.affiliation: Department of Electrical Engineering and Computer Sciences, University of California at Berkeley, Berkeley, CA 94720, USA. bala@berkeley.edu
authors.forename: Bala
authors.initials: B
authors.lastname: Pesala
authors.forename: Forrest
authors.initials: F
authors.lastname: Sedgwick
authors.forename: Alexander V
authors.initials: AV
authors.lastname: Uskov
authors.forename: Connie
authors.initials: C
authors.lastname: Chang-Hasnain
mesh_terms: D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008027:Light; D008962:Models, Theoretical; D055096:Optical Devices; D015203:Reproducibility of Results; D012542:Scattering, Radiation; D012666:Semiconductors; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*