Title :
Theoretical analysis of a hybrid AM-VSB/QAM SCM lightwave system with adjustable preclipping levels
Author :
Tarn, Chen-Wen ; Shin, Hong-Bin
Author_Institution :
Dept. of Electron. Eng., Nat. Taiwan Univ., Taipei, Taiwan
fDate :
11/1/1999 12:00:00 AM
Abstract :
A model for the analysis of the performance of a hybrid multichannel amplitude modulation vestigal sideband (AM-VSB)/quadrature amplitude modulation (QAM) subcarrier-multiplexed (SCM) lightwave transmission system with adjustable preclipping levels is presented. In the proposed model, two-stage adjustable clipping effect due to the preclipper and laser are considered. The analytical result shows that in this hybrid system the bit error rate (BER) is improved while the carrier-to nonlinear distortion (C/NLD) ratio is degraded as the value of the preclipping factor, is decreased, and vice versa. The validity of this model is verified by comparing the theoretical optimal value of τ which is derived using our approach with the existed experimental result
Keywords :
amplitude modulation; digital communication; error statistics; nonlinear distortion; optical fibre communication; optical modulation; quadrature amplitude modulation; subcarrier multiplexing; BER improvement; C/NLD ratio; adjustable preclipping levels; amplitude modulation; bit error rate; carrier-to nonlinear distortion ratio; hybrid AM-VSB/QAM SCM lightwave system; multichannel system; performance analysis model; quadrature amplitude modulation; subcarrier-multiplexed transmission system; vestigal sideband; Amplitude modulation; Bit error rate; Degradation; Diode lasers; Frequency; Laboratories; Laser modes; Noise level; Nonlinear distortion; Quadrature amplitude modulation;
Journal_Title :
Lightwave Technology, Journal of
