title: Experimental demonstration of slow and superluminal light in semiconductor optical amplifiers.
abstract: Tunable delays in semiconductor optical amplifiers are achieved via four wave mixing between a strong pump beam and a modulated probe beam. The delay of the probe beam can be controlled both electrically, by changing the SOA bias, and optically, by varying the pump power or the pump-probe detuning. For sinusoidal modulated signal at 0.5 GHz, a tunable delay of 1.6 ns is achieved. This corresponds to a RF phase change of 1.6 pi. For 1.3 ns optical pulses propagating through the SOA a delay of 0.59 ns is achieved corresponding to a delay-bandwidth product exceeding 0.45. For both the cases, slow light and superluminal light are observed as the pump-probe detuning is varied.
authors.forename: Bala
authors.initials: B
authors.lastname: Pesala
authors.forename: Zhangyuan
authors.initials: Z
authors.lastname: Chen
authors.forename: Alexander V
authors.initials: AV
authors.lastname: Uskov
authors.forename: Connie
authors.initials: C
authors.lastname: Chang-Hasnain