Abstract
This paper presents a possible utilization of advances signal processing techniques in the optical transmission system at the signal transmission. A contribution briefly introduces basic characteristics of the optical fiber, Forward Error Correction techniques and digital modulation formats considered for analysis. The paper mainly focuses on RS and BCH codes used in conjunction with OOK and BPSK techniques and their practical exploitation in the optical transmission system. Then, a created simulation program for the optical transmission system is presented with detailed description of blocks related to mutual cooperation RS and BCH codes with binary modulation techniques (OOK, DBPSK and BPSK). In the third part, more detailed analyses of RS and BCH performances are presented.
Highlights
1 Introduction the simulation program for presenting optical signals passing through the optical transmission path influenced by linear and nonlinear effects is described
Both RS and BCH codes were used on On/Off shift Keying (OOK), Binary Phase Shift Keying (BPSK) and Differential Binary Phase Shift Keying (DBPSK) modulation
The graph plotted between different modulation techniques with RS code and BCH code shows the performance gain of RS code over BCH code in optical transmission system
Summary
A basics of the optical effects are presented by the optical transmission medium. Major impairments of optical signals transmitted via optical fiber are mainly caused by linear effects - the dispersion and the attenuation. Optical transmission systems are able to minimize impact of the attenuation by deploying regenerators or all optical amplifiers like Raman or EDFA amplifiers Another source of linear effects represents the dispersion that causes broadening of optical pulses in time and phase shifting of signals at the fiber end. Modal dispersion caused by the different propagation velocity of signal modes in multimode fibers. Chromatic dispersion caused by the different propagation velocity of signal wavelengths from a laser source via optical fibers. Self-phase Modulation (SPM) - effect that changes the refractive index of the transmission medium caused by intensity of the pulse. Stimulated Brillouin Scattering (SBS) and Stimulated Raman Scattering (SRS) - effects that change variance of light wave into different waves when the intensity reaches certain threshold [5,6,7,8,9]
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