Abstract

AbstractDigital pulse position modulation (PPM) has been shown to be an effective modulation format for the optical fibre channel. It is paricularly attractive as it can exploit the abundant mono‐mode optical fibre bandwidth to offer improved performance. The format is a discrete time modulation format wherein synchronisation at both the slot and the frame levels is vital. In this paper we derive an original analytic expression that predicts the spectral properties of optical fibre digital PPM on the basis of its cyclostationary random properties. We establish the conditions required to achieve both slot and frame synchronisation and further, we show that the system synchronisability can be optimised in terms of its parameters. In particular, we consider die effect of the pulse shape, modulation index and the data probability distribution on the spectral properties. Finally, we present original practical results measured on a 128‐ary PPM system and show that they are within 1 dB of those predicted by our analytic model. We conclude that optical fibre digital PPM synchronisation can be achieved and further, optimised, in terms of the major system parameters.

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