1 October 1991 Optical fiber n-ary PPM: approaching fundamental limits in receiver sensitivity
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The n-ary pulse position modulation is a means by which excess optical fiber bandwidth can be exchanged for improved receiver sensitivity. Here, we consider both direct detection (PIN- BJT and PIN-FET) and coherent n-ary PPM over a range of fiber bandwidths and PPM word sizes. Our results illustrate that n-ary PPM offers an improvement of between 5 - 11 dB over equivalent PCM systems. Assuming an optical fiber attenuation of 0.2 dB/km this represents an increase in regenerator spacing of between 25 - 55 km. The theoretical results demonstrate that n-ary PPM is a promising modulation format and may have potential for future telecommunication routes.
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Robert A. Cryan, Robert A. Cryan, Rodney T. Unwin, Rodney T. Unwin, } "Optical fiber n-ary PPM: approaching fundamental limits in receiver sensitivity", Proc. SPIE 1579, Advanced Fiber Communications Technologies, (1 October 1991); doi: 10.1117/12.50146; https://doi.org/10.1117/12.50146

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