Abstract
We examine the photocurrent effect in the electroabsorption modulator
(EAM) under very high optical power and investigate its implication in the
link radio-frequency (RF) gain. After reviewing the effect of the
photocurrent in the EAM, using the voltage-source model with the device
capacitance included, we demonstrate a possibility that the RF gain can be
enhanced by resonance due to the photocurrent if the photocurrent decreases
with device bias, exhibiting negative differential resistance. We explore an
EAM with intrastep quantum wells showing blueshift to achieve the negative
photocurrent resistance and demonstrate a case where an enhancement in the
link RF gain is possible.
© 2010 IEEE
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