Abstract
AbstractThe problem of determining the precise slot boundaries is an essential one in optical‐fiber pulse position modulation (PPM) systems due to the temporal nature of the format. Here we present an original spectral characterization of the PPM process and establish the requirements to realize a discrete spectral slot rate component. In particular we show that this component is independent of the modulation index and data probability distribution. The dependence of the component on pulse shapes is investigated and examined for the important class of dispersed Gaussian‐type pulse shapes normally associated with optical‐fiber transmission. Original practical results, measured on a 128‐slot PPM system, are presented and shown to be in agreement with the theoretical predictions to within 1 dB. © 1993 John Wiley & Sons, Inc.
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