Abstract
Previously published analytical models for the noise figure of an amplifierless
fiber-optic link fail to predict the measured performance, with a discrepancy
of 1.1 dB at 1 GHz that increases to 2.3 dB by 12 GHz. We use an equivalent
circuit to derive the effect of an additional source of noise not accounted
for in earlier models: thermal noise arising from loss in the modulator's
traveling-wave electrodes. The electrode thermal noise has a frequency dependence
matching that of the link's noise figure, such that predictions using the
improved model match the measured 1–12 GHz performance of a link with
record low noise figure to within ~0.4 dB across this band.
© 2008 IEEE
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