MATHEMATICAL MODELING OF FIBER-OPTIC TRANSMISSION SYSTEM WITH INTENSITY MODULATION

Fibre optic transmission systems are widespread in the transport network. Optical Transport Hierarchy (OTH) basis of The principle wavelength multiplexing channels is used to increase technical and economic performance. Technically a simpler type intensity modulation transmit OTU1 OTU2 OTH frames. Erbium-doped fibre-based optical amplifiers also generate amplified spontaneous emission noise, which degrades performance system. qualitative characteristics channel system with investigated this paper. In simulation process, it possible neglect nonlinear signal distortion fiber at nominal power transponder transmitter. Therefore, studied model, an oscillation consisting two components (signal noise) arrives receiver input. case, electrical three summands (signal-signal, signal-noise noise-noise) will be generated output photodiode. A simplified formula for calculating Q-factor signal, affects error probability channel, proposed most specialized literature. Numerical values were calculated They compared reference results obtained by Optiwave Optisystem software. analysis data has proved that calculation relative order 39-59%. more accurate result can using expression takes into account both noise photodiode output.