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Comparison of numerical and experimental simulations of clipping induced distortion for NTSC CATV systems

In the lightwave CATV systems, subcarrier multiplexing has emerged as the most popular transmission technique. The driving current waveform is clipped at the threshold of a linear transfer function of the laser diode if the overall modulation exceeds 100%. The nonlinear distortion noise due to a little clipping is tolerable because overmodulation maximizes the RMS OMI and the CNR. We have compared the numerical and experimental results of the probability of the overmodulation versus the carrier to nonlinear distortion ratio (CNLD). We found reasonable results under the same computation conditions for the RMS modulation index in the optimum range (/spl mu/=[0.65-0.3]) and both graphs are similar to each other with no discrepancies.