Polarization-independent InGaAlAs/InAlAs electroabsorption modulators with an optimized strained-MQW

It is well known that polarization-independent operation has been obtained in a MQW EA modulator with tensile-strained walls. However, as far we know, no synthetic approach to the polarization-independent EA modulator by means of optimizing the MQW strain has been reported. In this paper, we describe a well-resolved absorption spectra correlating to the valence-subband structure as a function of the strain of the well. Also we report our development of the polarization-independent InGaAlAs/InAlAs MQW EA modulator by optimizing the MQW strain and the structure of the modulator.