LOW SPECTRAL CHIRP AND LARGE ELECTROABSORPTION IN A STRAINED INGAASP INGAASP MULTIPLE-QUANTUM-WELL MODULATOR/

An intensity modulator based on the quantum confined Stark effect with strained InGaAsP quantum wells and InGaAsP barriers was grown using g as source molecular beam epitaxy. The highest electroabsorption effect and the first estimation of the spectral chirp ever reported with suc h a modulator under TE polarization mode around 1.55 mum were obtained . The attenuation was measured to be better than -30 dB with a reverse driving voltage lower than 3 V and the phase-amplitude coupling facto r has been estimated to be lower than 0.2 over a large operating wavel ength range.