Abstract
Femtosecond electrical pulses have recently been generated and measured1 using exciton ionization in quantum well structures. The propagation of such enormous bandwidth signals in typical microwave transmission lines is primarily limited by modal dispersion resulting from the inhomogeneous dielectric media.2,3 The effect of modal dispersion has been reduced by using copolanar strips on free-standing GaAs epitaxial films a few microns thin or thinner.1 However, material dispersion due to optical phonon resonances in the thin GaAs substrate still affects short pulse propagation significantly.
© 1990 Optical Society of America
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