17 December 1992 Optical soliton transmission with n-ary PPM
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In n-ary PPM, a single high energy pulse is used to convey M bits of information. In this paper we propose that advantage be taken of the fiber non-linearity such that the n-ary PPM pulse becomes a temporal soliton. We examine the maximum achievable bit rate of such a system and compare it to that of PCM. We show that under ideal conditions (no fluctuations of the input soliton pulse width) n-ary PPM can be used to achieve a higher bit-rate than PCM. However, in a practical situation fluctuations of the input soliton pulse width are translated to variations in the soliton pulse position. We show that this has a severe effect on the error probability of n-ary PPM and that in this situation PCM offers greater immunity. Finally, we consider the implications of the Gordon-Haus effect on the maximum transmission distance of n-ary PPM and show that it is less than that for PCM due to the narrower pulse arrival time window.
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Robert A. Cryan, Robert A. Cryan, Rodney T. Unwin, Rodney T. Unwin, } "Optical soliton transmission with n-ary PPM", Proc. SPIE 1787, Multigigabit Fiber Communications, (17 December 1992); doi: 10.1117/12.139320; https://doi.org/10.1117/12.139320

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