Title :
Comparison of numerical and experimental simulations of clipping induced distortion for NTSC CATV systems
Author :
Chieh Hao Lu ; Boukli-Hacene, Mokhtar
Author_Institution :
Dept. of Electr. Eng., Polytechnic Univ., Brooklyn, NY, USA
Abstract :
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 (μ=[0.65-0.3]) and both graphs are similar to each other with no discrepancies
Keywords :
cable television; digital simulation; laser beams; numerical analysis; optical fibre networks; optical modulation; simulation; subcarrier multiplexing; CNLD; CNR; NTSC CATV systems; RMS OMI; RMS modulation index; carrier to nonlinear distortion ratio; clipping induced distortion; driving current waveform; experimental results; experimental simulation; laser diode; lightwave CATV systems; linear transfer function; modulation; nonlinear distortion noise; numerical simulation; overmodulation probability; subcarrier multiplexing; transmission technique; Bandwidth; Diode lasers; Modulation; Noise figure; Nonlinear distortion; Numerical simulation; Optical fibers; Optical noise; Transfer functions; Virtual manufacturing;
Conference_Titel :
Computers and Communications, 1996., Conference Proceedings of the 1996 IEEE Fifteenth Annual International Phoenix Conference on
Conference_Location :
Scottsdale, AZ
Print_ISBN :
0-7803-3255-5
DOI :
10.1109/PCCC.1996.493616
