Abstract
The application of the saddle point integration method for evaluating the probability density function of a DPSK signal in the presence of intrachannel crosstalk and ASE noise is investigated. Numerical results for a 10 Gbit/s optically pre-amplified direct detection receiver show that the shape of the density has an asymmetric two-pronged structure. Moreover, the reliability of a saddle point approximation is also studied, and shown that this technique estimates very well the tails of the density, but lacks accuracy in the central region.
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