Abstract: This paper considers high capacity long-haul optical communication systems. The dispersion compensation, using the compensation fibers, is often applied in such systems. The shape of the impulse at the receiver input is determined by solving the Schroedinger equation. In this paper, we derive the expressions for determining the error probability of intensity-modulation/direct- detection (IM/DD) communication systems in the presence of the noise and interferences. The interferences appear at the transmitter, optical fiber and receiver. The noise sources are the photo detectors and resistances at the receive.
Key words: Optical communication system, error probability, fiber dispersion, Poisson probability function, Gaussian noise.