Abstract
The optical return-to-zero differential phase shift keying system is analyzed in this chapter to determine the accuracy of the recently proposed differential phase Q method in estimating the bit error rate. It is found that this method consistently underestimates the bit error rate though it successfully predicts the qualitative behavior of single channel and wavelength division multiplexed systems for back-to-back and point-to-point configurations. A simple modification reduced the underestimation and produced highly accurate estimation.
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