Broadband and ultrafast cross-phase modulation in InGaAs/AlAsSb coupled quantum well waveguides: mechanism and optimization

摘要

We adopted the spectral method to evaluate the picosecond cross-phase modulation (XPM) of InGaAs/AlAsSb coupled double quantum wells in the whole telecommunication wavelength region, which indicated an about 300 nm broadband feature. The XPM wavelength dependence reveals the interband dispersion model under intersubband excitation. Based on this model, the quantum well structure was optimized by eight-band hp method for enhancing the XPM power efficiency.