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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2504.16769 |
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| _version_ | 1866912343301029888 |
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| author | Li, Rui-Qian Shen, Yi-Wei Niu, Zekun Xu, Guozhi Yu, Jingyi He, Xuming Yi, Lilin Wang, Cheng |
| author_facet | Li, Rui-Qian Shen, Yi-Wei Niu, Zekun Xu, Guozhi Yu, Jingyi He, Xuming Yi, Lilin Wang, Cheng |
| contents | Photonic reservoir computer (PRC) is a kind of real-time and adaptive recurrent neural network, where only weights in the readout layer require training. PRC is a promising tool to deal with the crucial issue of nonlinear equalization in optical fiber communications. Here we theoretically show a deep PRC for the nonlinear equalization of coherent signals with the format of 16- level quadrature amplitude modulation (16-QAM). The deep PRC consists of cascading injection-locked Fabry-Perot lasers with optical feedback. Both the in-phase component and the quadrature component of the 16-QAM signals are simultaneously injected into the deep PRC in parallel, based on the wavelength multiplexing of Fabry-Perot lasers. It is demonstrated that the deep PRC exhibits strong capability for the nonlinearity compensation of coherent signals. The Q factor is improved by more than 1 dB for 16-QAM signals with launch powers above 10 dBm, associated with a bit rate of 240 Gbps and a transmission distance of 50 km. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_16769 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Deep photonic reservoir computer for nonlinear equalization of 16-level quadrature amplitude modulation signals Li, Rui-Qian Shen, Yi-Wei Niu, Zekun Xu, Guozhi Yu, Jingyi He, Xuming Yi, Lilin Wang, Cheng Optics Photonic reservoir computer (PRC) is a kind of real-time and adaptive recurrent neural network, where only weights in the readout layer require training. PRC is a promising tool to deal with the crucial issue of nonlinear equalization in optical fiber communications. Here we theoretically show a deep PRC for the nonlinear equalization of coherent signals with the format of 16- level quadrature amplitude modulation (16-QAM). The deep PRC consists of cascading injection-locked Fabry-Perot lasers with optical feedback. Both the in-phase component and the quadrature component of the 16-QAM signals are simultaneously injected into the deep PRC in parallel, based on the wavelength multiplexing of Fabry-Perot lasers. It is demonstrated that the deep PRC exhibits strong capability for the nonlinearity compensation of coherent signals. The Q factor is improved by more than 1 dB for 16-QAM signals with launch powers above 10 dBm, associated with a bit rate of 240 Gbps and a transmission distance of 50 km. |
| title | Deep photonic reservoir computer for nonlinear equalization of 16-level quadrature amplitude modulation signals |
| topic | Optics |
| url | https://arxiv.org/abs/2504.16769 |