Abstract
This paper presents a novel technique that allows easy and accurate
estimation of the system bit error rate (BER) by collecting the statistical
distribution of the receiver analog samples, i.e., before decision. It could
be used to implement effective optical performance monitoring in real systems,
with limited hardware complexity. The scheme performance is confirmed by both numerical
simulations and experimental measurements. In all cases, the estimated BER
is found to be very close to the real value, thus providing accurate and robust
estimations. It is experimentally verified
that in presence of strong intersymbol interference (ISI), or in the highly
nonlinear regime, our technique works much better than the well known <i>Q</i>-factor approach.
© 2012 IEEE
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