Abstract
The effect of mode-partition induced noise (MPN) on the performance of high-frequency digital systems has been widely investigated. The effect of such noise on subcarrier-multiplex (SCM) based systems, however, has not been studied as thoroughly. Performance of the reported SCM lightwave systems has mostly been established by stating the optical power margin (12-20 dB),1–3 although a transmission distance of 18 km has been reported for 60 SCM video channels.1 In this paper we investigate MPN in the presence of dispersive fiber, which was found to appear as the aggravated low-frequency intensity noise translated around the carrier, and we conclude that for maintaining a signal-tonoise ratio of 60 dB, total dispersion must be less than 23 ps/nm. This result implies that distances exceeding 10 km can be achieved only by reducing the low-frequency intensity noise of the source and matching its wavelength to the fiber zero-dispersion wavelength.
© 1991 Optical Society of America
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