Data-driven Optical Fiber Channel Modeling: A Deep Learning Approach

• Published in: Journal of lightwave technology 2020-09, Vol.38 (17), p.4730-4743
• Main Authors: Wang, Danshi, Song, Yuchen, Li, Jin, Qin, Jun, Yang, Tao, Zhang, Min, Chen, Xue, Boucouvalas, Anthony C.
• Format: Article
• Language: English
• Subjects: Algorithms; bidirectional long short-term memory (BiLSTM); Communications systems; Computer networks; Computer simulation; Computing time; data driven; Deep learning; fiber channel modeling; Iterative methods; Keying; Machine learning; Mathematical model; Modelling; Optical communication; Optical fiber communication; Optical fiber dispersion; Optical fiber theory; Optical fibers; Optical transmitters; Pulse amplitude modulation; Transfer functions; Waveforms
• ISSN: 0733-8724; 1558-2213
• DOI: 10.1109/JLT.2020.2993271

A data-driven fiber channel modeling method based on deep learning (DL) is introduced in an optical communication system. In this study, bidirectional long short-term memory (BiLSTM) is selected from a diverse range of DL algorithms to perform fiber channel modeling for on-off keying and pulse amplitude modulation 4 signals. Compared with the conventional model-driven split-step Fourier (SSF)-based method, the proposed method yields similar results based on the comprehensive comparison of multiple characteristics associated with the generated optical signals, including the optical amplitude and phase waveforms in the time domain, optical spectrum components in the frequency domain, and eye diagrams after detection in the electrical domain. Additionally, the effects of multiple factors on the modeled fiber channel have also be investigated, including fiber length, fiber nonlinearity, dispersion, data pattern, pulse shaping, and sample rate. The satisfactory fitting results and acceptable mean square errors indicate that the approximate transfer function of the fiber channel is learned by the BiLSTM. Moreover, compared with repetitive iteration SSF, the computing time is significantly reduced by the BiLSTM owing to its independence on fiber length and insensitivity to data size and launch power. Our aim is to demonstrate the BiLSTM is comparable with the conventional model-driven SSF-based method for direct-detection optical fiber system. We think the proposed method could be a supplementary technique that can be used for the existing simulation system and could also be a potential option for future simulation methods.