OPTIMIZATION OF THE CAPACITY OF A COMMUNICATION FIBER LINE WITH NONLINEAR MEMORY
E. G. Shapiro1,2, D. A. Shapiro1,2
1Institute of Automation and Electrometry, Siberian Branch, Russian Academy of Sciences, 630090, Novosibirsk, prosp. Academician Koptyuga, 1
2Novosibirsk State University, 630090, Novosibirsk, ul. Pirogova, 2
Keywords: волоконно-оптические линии связи, пропускная способность, нелинейный шум, канал с памятью, шенноновский предел, fiber-optic communication lines, capacity, non-linear noise, channel with memory, Shannon limit
Abstract
Channels with and without memory in the simplest Gaussian noise distribution model are compared. It is shown that both channels have similar dependences of the capacity on the average signal power. At the same time, the optimal input alphabet for the channel with memory changes. The applicability of the model with nonlinear memory to the QPSK communication line with a periodic dispersion compensation is demonstrated numerically.
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