Abstract
Abstract In this paper we determine the exact direct detection receiver decision statistics independent of optical and electrical filter choice, pulse shape and on modulation scheme, propose an advanced receiver model for the optically amplified communication system and a novel multipath interference (MPI) model independent of MPI crosstalk level, modulation format, optical and electrical filter choice as well. The channel is modeled as a stationary additive noise channel with intersymbol interference (ISI). The additive noise composed of the amplifier spontaneous emission, multi-path interference and other additive noise sources can have arbitrary statistics. The validity of the proposed receiver model is verified by Monte Carlo simulations for different modulation schemes such as non return to zero (NRZ), return to zero (RZ), chirped return to zero (CRZ) and carrier suppressed return to zero (CSRZ) in the presence of amplifier spontaneous emission (ASE) noise, MPI and ISI. An excellent agreement is obtained for the all considered schemes.
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