Abstract
Calculations based on a rigorous analytical model are carried out to
optimize the width of the indium phosphide avalanche region in high-speed
direct-detection avalanche photodiode-based optical receivers. The model
includes the effects of intersymbol interference (ISI), tunneling current,
avalanche noise, and its correlation with the stochastic avalanche duration,
as well as dead space. A minimum receiver sensitivity of $-$28 dBm is predicted at an optimal width of 0.18 $\mu{\hbox {m}}$ and an optimal gain of approximately 13, for a 10 Gb/s
communication system, assuming a Johnson noise level of 629 noise electrons
per bit. The interplay among the factors controlling the optimum sensitivity
is confirmed. Results show that for a given transmission speed, as the
device width decreases below an optimum value, increased tunneling current
outweighs avalanche noise reduction due to dead space, resulting in an
increase in receiver sensitivity. As the device width increases above its
optimum value, the receiver sensitivity increases as device bandwidth
decreases, causing ISI to dominate avalanche noise and tunneling current
shot noise.
© 2009 IEEE
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