Abstract
Photodiodes with millimeter-wave responses are normally measured in the frequency domain. The results do not give the optoelectronic phase response (TS21), and, therefore, the temporal response cannot be determined. Electro-optic sampling gives time domain measurements directly, but this technique is normally performed on a planar substrate, and thus the coaxial-planar transformer and line dispersion must be accurately characterized. Photodiodes are generally simple structures, amenable to analysis and modeling. We use knowledge of the photodiode and mount structure, together with measurements of the scalar optoelectronic response (|S21|) and tlie vector electrical return loss (S22), to determine an accurate equivalent-circuit model of the device. An estimate of the temporal response can then be determined without the limitations inherent in some of the time-domain measurement methods.
© 1991 Optical Society of America
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