We have studied the ultrafast response of uni-traveling-carrier photodiodes with photo-absorption layer doping levels from 2.5 ×1017 to 2.5 ×1018 cm-3. It is found that 3-dB band width increases with the output voltage in the low output region. This enhancement is more prominent for a lower doping level in the photo-absorption layer. From the analysis of the carrier transport in the photo-absorption layer, we attribute the observed enhanced bandwidth as a result of the self-induced electric field associated with carrier injection.
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Shimizu et al. (1998) studied this question.
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