Accurate modeling of incoherent homodyne crosstalk in optically amplified systems

A number of models with various degrees of accuracy were proposed in the literature for the evaluation of the probability density function (pdf) of the direct detection receiver photocurrent in optically amplified communication systems in the presence of N incoherent homodyne interferers. Previous models neglect the crosstalk-crosstalk and amplified spontaneous emission (ASE) noise-crosstalk beatings, as well as the direct detection of the crosstalk and the ASE noise. These effects become important at strong crosstalk values. This paper presents, for the first time, an accurate derivation of the photocurrent pdf, taking into account the aforementioned neglected terms