Abstract
AM-virtual-sideband/M-ary quadrature-amplitude-modulation (AM-VSB/M-QAM) hybrid optical transmission has been shown to be a very promising technique for allowing the CATV' industry to use the I-GHz bandwidth made available with systems based on liber feeders.1-3 Traditional AM-VSB channels (55.25-439.25 MHz are provided, and new digital services can be delivered in the high-frequency band (500 MHz to 1 GHz by using multilevel of techniques. However, recent studies have demonstrated that the interference from the AM band can cause serious impairment in QAM bit-error performance.2,3 The QAM bit-error probability can be increased greatly by AM interference, regardless of the QAM signal level. In this paper we confirm that this bit-error impairment is caused entirely by clipping-induced impulse noise, as shown in Fig. 1. Furthermore, we define a new parameter that can be measured on a spectrum analyzer and used to predict QAM bit-error characteristics.
© 1994 Optical Society of America
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