Analysis of polarization-independent large field-induced refractive index change without red shift of absorption edge in a strained five-step GaAs-InAlGaAs asymmetric coupled quantum well

A tensile-strained five-step asymmetric coupled quantum well (FACQW) structure is proposed for the first time for large field-induced refractive index change without polarization-dependence and red-shift of absorption edge. The refractive index change of strained FACQW is larger by one order of magnitude compared to that of rectangular quantum well and the difference of the refractive index changes of TE-mode and TM-mode is under 2% when the operation wavelength is apart from absorption edge.