THEORETICAL AND EXPERIMENTAL-ANALYSIS OF MACH-ZEHNDER QUANTUM-WELL MODULATORS

A theoretical model of the electro-optic properties of III-V multiple quantum well systems is compared to photocurrent spectrum measurements . Our technique, which is essentially free of adjustable parameters pr ovides accurate estimates of both the absorption and refractive index far below the band edge. We have found that the proper inclusion of bo th inter-subband mixing effects and the angular dependence of the opti cal matrix elements is required to obtain satisfactory agreement with experiment. (C) 1996 American Institute of Physics.