Abstract
We study the balanced detection of broadband incoherent optical signals—signals
characterized by high-intensity noise. We consider signals generated from
a single incoherent source with two types of correlation: identical spectra,
but delayed in time, and overlapping, nonidentical spectra but zero time delay.
Our statistical analysis yields equations for the probability density function
(pdf) of the balanced detector output for partially correlated input signals
based on easily measured system parameters (power spectral densities in one
case, relative time delay in the other). Using analytical tools we derive
expressions for output pdfs giving extremely good prediction of measured pdfs
for signals with correlation coefficient up to 95%. The analytic expressions
can be used to characterize system performance, in particular, bit error rate
for communications systems.
© 2008 IEEE
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