Application of Transformers for Nonlinear Channel Compensation in Optical Systems
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arXiv
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| Autores principales: | , , , |
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| Formato: | Preprint |
| Publicado: |
2023
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| Acceso en línea: | |
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| _version_ | 1866910549378334720 |
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| author | Hamgini, Behnam Behinaein Najafi, Hossein Bakhshali, Ali Zhang, Zhuhong |
| author_facet | Hamgini, Behnam Behinaein Najafi, Hossein Bakhshali, Ali Zhang, Zhuhong |
| contents | In this paper, we introduce a new nonlinear optical channel equalizer based on Transformers. By leveraging parallel computation and attending directly to the memory across a sequence of symbols, we show that Transformers can be used effectively for nonlinear compensation (NLC) in coherent long-haul transmission systems. For this application, we present an implementation of the encoder part of the Transformer and analyze its performance over a wide range of different hyper-parameters. It is shown that by proper embeddings and processing blocks of symbols at each iteration and also carefully selecting subsets of the encoder's output to be processed together, an efficient nonlinear equalization can be achieved for different complexity constraints. To reduce the computational complexity of the attention mechanism, we further propose the use of a physic-informed mask inspired by nonlinear perturbation theory. We also compare the Transformer-NLC with digital back-propagation (DBP) under different transmission scenarios in order to demonstrate the flexibility and generalizability of the proposed data-driven solution. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2304_13119 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Application of Transformers for Nonlinear Channel Compensation in Optical Systems Hamgini, Behnam Behinaein Najafi, Hossein Bakhshali, Ali Zhang, Zhuhong Information Theory Machine Learning Signal Processing In this paper, we introduce a new nonlinear optical channel equalizer based on Transformers. By leveraging parallel computation and attending directly to the memory across a sequence of symbols, we show that Transformers can be used effectively for nonlinear compensation (NLC) in coherent long-haul transmission systems. For this application, we present an implementation of the encoder part of the Transformer and analyze its performance over a wide range of different hyper-parameters. It is shown that by proper embeddings and processing blocks of symbols at each iteration and also carefully selecting subsets of the encoder's output to be processed together, an efficient nonlinear equalization can be achieved for different complexity constraints. To reduce the computational complexity of the attention mechanism, we further propose the use of a physic-informed mask inspired by nonlinear perturbation theory. We also compare the Transformer-NLC with digital back-propagation (DBP) under different transmission scenarios in order to demonstrate the flexibility and generalizability of the proposed data-driven solution. |
| title | Application of Transformers for Nonlinear Channel Compensation in Optical Systems |
| topic | Information Theory Machine Learning Signal Processing |
| url | https://arxiv.org/abs/2304.13119 |