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Proceedings Paper

Computational-complexity comparison of time- and frequency-domain artificial neural networks for optical nonlinearity compensation
Author(s): Takeru Kyono; Moriya Nakamura
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Paper Abstract

We compared the performance and the computational complexity of a time-domain- (TD-) artificial neural network (ANN) and a frequency-domain- (FD-) ANN used for nonlinearity compensation in optical fiber communication systems. In optical communication systems, ANNs have been used for coherent optical orthogonal frequency division multiplexing (CO-OFDM) transmission systems in the frequency domain. TD-ANN-based optical nonlinearity compensation has also been investigated in the last few years. For linear equalization to compensate for, e.g., chromatic dispersion (CD), it is known that FD-equalization outperforms TD-equalization in terms of computational complexity over a wide range of CD values. However, TD-ANNs and FD-ANNs have not been investigated in order to compare them in terms of computational complexity, to the best of our knowledge. In this paper, we investigated and compared the computational complexity of a TD-ANN and an FD-ANN which are used for optical nonlinearity compensation. We evaluated the number of complex multiplications needed for nonlinear compensation per symbol. The compensation performance was investigated using 16-ary quadrature amplitude modulation (16QAM) signal transmission over a standard single-mode fiber (SSMF) by numerical simulation. The results showed that the TD-ANN outperformed the FD-ANN in terms of computational complexity.

Paper Details

Date Published: 24 February 2020
PDF: 6 pages
Proc. SPIE 11299, AI and Optical Data Sciences, 1129915 (24 February 2020); doi: 10.1117/12.2545720
Show Author Affiliations
Takeru Kyono, Meiji Univ. (Japan)
Moriya Nakamura, Meiji Univ. (Japan)

Published in SPIE Proceedings Vol. 11299:
AI and Optical Data Sciences
Bahram Jalali; Ken-ichi Kitayama, Editor(s)

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