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在半导体光放大器光纤环形激光器的基础上, 提出一种基于偏振动力学的全光储备池计算系统. 实验分析了该激光器的偏振动力学状态响应的影响因素, 且结合储备池基本属性确定了系统参数的选取范围. 通过处理Santa Fe时间序列预测任务和多波形识别任务来评估该储备池计算系统的网络性能. 在合适的系统参数下, 仅用30个虚节点, 时间序列预测任务的归一化均方误差可低至0.0058, 识别任务的识别率可高达100%. 实验结果表明, 该偏振动力学储备池计算系统具有良好的预测性能和分类能力, 且与已有的基于该环形激光器的强度动力学储备池计算系统的性能相当. 该工作为光储备池计算神经网络的研究提供了新的思路. 当其偏振动力学和强度动力学一起使用时, 该系统有望实现两个任务的并行处理.Reservoir computing (RC) is a simplified recurrent neural network and can be implemented by using a nonlinear system with delay feedback, thus it is called delay-based RC. Various nonlinear nodes and feedback loop structures have been proposed. Most of existing researches are based on the dynamical responses in intensity of the nonlinear systems. There are also a photoelectric RC system based on wavelength dynamics and an all-optical RC based on the phase dynamics of a semiconductor laser with optical feedback, as well as so-called polarization dynamics of a vertical cavity surface emitting laser (VCSEL). However, these VCSEL-RCs actually are based on the intensity dynamics of two mutually orthogonal polarization modes, or polarization-resolved intensity dynamics. The RC based on rich dynamical responses in polarization has not yet been found. A semiconductor optical amplifier (SOA) fiber ring laser can produce rich dynamical states in polarization, and is used in optical chaotic secure communication and distributed optical fiber sensing. To further expand the application of polarization dynamics of the SOA fiber ring laser and open up a new direction for the research of optical RC neural network, an all-optical RC system based on polarization dynamics of the ring laser is proposed. The ring laser is used as the reservoir, and the SOA as the nonlinear node. After the input signal is masked according to a synchronization scheme, it is injected into the reservoir by intensity modulation for a continuous wave generated by a superluminescent light emitting diode (SLED). The dynamical response in polarization of the ring laser is detected by a polarizer and a photodetector. The influences of the SOA operation current, output power of the SLED and attenuation of a variable optical attenuator (VOA) in the fiber loop on the polarization dynamic characteristic (mainly referring to the output degree of polarization) of the laser are analyzed experimentally. The fading memory and nonlinear response of the RC system based on the polarization dynamic response and intensity dynamic response are compared experimentally. The influences of output power of the SLED and attenuation of the VOA on fading memory, consistency and separation of the RC system based on the two kinds of dynamic responses are investigated experimentally. Thus the range of the VOA attenuation is determined. The network performance of the polarization dynamics RC system is evaluated by processing a Santa Fe time series prediction task and a multi-waveform recognition task. The normalized mean square error can be as low as 0.0058 for the time series prediction task, and the identification rate can be as high as 100% for the recognition task under the appropriate system parameters and only 30 virtual nodes. The experimental results show that the polarization dynamics RC system has good prediction performance and classification capability, which are comparable to the existing RC system based on intensity dynamics of the ring laser. The system can be expected to process two tasks in parallel when the polarization dynamics and intensity dynamics are used at the same time.
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Keywords:
- reservoir computing /
- polarization dynamics /
- optical fiber ring laser /
- semiconductor optical amplifier
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Zhao L, Fang N, Wang Y, Huang Z M 2009 Acta Photon. Sin. 38 2449
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图 1 基于SOA光纤环形激光器的偏振动力学储备池计算系统. AWG, 任意波形发生器; SLED, 超辐射发光二极管; IM, 强度调制器; FC, 光纤耦合器; PC, 偏振控制器; ISO, 隔离器; SOA, 半导体光放大器; VOA, 可调光衰减器; PD, 光电探测器
Fig. 1. Polarization dynamics reservoir computing system based on a SOA fiber ring laser. AWG, arbitrary waveform generator; SLED, superluminescent light emitting diode; IM, intensity modulator; FC, fiber coupler; PC, polarization controller; ISO, isolator; SOA, semiconductor optical amplifier; VOA, variable optical attenuator; PD, photodetector
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[1] Jaeger H 2001 The “Echo State” Approach to Analysing and Training Recurrent Neural Networks (Bonn, Germany: National Research Center for Information Technology) Technical Report GMD Report 148
[2] Maass W, Natschläger T, Markram H 2002 Neural Comput. 14 2531Google Scholar
[3] Verstraeten D, Schrauwen B, D'Haene M, Stroobandt D 2007 Neural Networks 20 391Google Scholar
[4] Soriano M C, Brunner D, Escalona-Morán M, Mirasso C R, Fischer I 2015 Front Comput. Neurosci. 9 68Google Scholar
[5] Duport F, Schneider B, Smerieri A, Haelterman M, Massar S 2012 Opt. Express 20 22783Google Scholar
[6] Brunner D, Soriano M C, Mirasso C R, Fischer I 2013 Nat. Commun. 4 1364Google Scholar
[7] Dmitriev P S, Kovalev A V, Locquet A, Rontani D, Viktorov E A 2020 Opt. Lett. 45 6150Google Scholar
[8] Dejonckheere A, Duport F, Smerieri A, Fang L, Oudar J L, Haelterman M, Massar S 2014 Opt. Express 22 10868Google Scholar
[9] Zhang H, Feng X, Li B X, Wang Y, Cui K Y, Liu F, Dou W B, Huang Y D 2014 Opt. Express 22 31356Google Scholar
[10] Vinckier Q, Duport F, Smerieri A, Vandoorne K, Bienstman P, Haelterman M, Massar S 2015 Optica 2 438Google Scholar
[11] Nguimdo R M, Verschaffelt G, Danckaert J, Vander Sander G 2015 IEEE Trans. Neural Networks Learn. Syst. 26 3301Google Scholar
[12] Zhao T, Xie W L, Guo Y Q, Xu J W, Guo Y Y, Wang L S 2022 Electronics 11 1578Google Scholar
[13] 李磊, 方捻, 王陆唐, 黄肇明 2018 电子学报 46 298Google Scholar
Li L, Fang N, Wang L T, Huang Z M 2018 Acta Electron. Sin. 46 298Google Scholar
[14] Hou Y S, Xia G Q, Yang W Y, Wang D, Jayaprasath E, Jiang Z F, Hu C X, Wu Z M 2018 Opt. Express 26 10211Google Scholar
[15] Chen Y P, Yi L L, Ke J X, Yang Z, Yang Y P, Huang L Y, Zhuge Q B, Hu W S 2019 Opt. Express 27 27431Google Scholar
[16] Martinenghi R, Rybalko S, Jacquot M, Chembo Y K, Larger L 2012 Phys. Rev. Lett. 108 244101Google Scholar
[17] Nguimdo R M, Verschaffelt G, Danckaert J, Vander Sander G 2014 Opt. Express 22 8672Google Scholar
[18] Vatin J, Rontani D, Sciamanna M 2018 Opt. Lett. 43 4497Google Scholar
[19] Vatin J, Rontani D, Sciamanna M 2019 Opt. Express 27 18579Google Scholar
[20] Guo X X, Xiang S Y, Zhang Y H, Lin L, Wen A J, Hao Y 2020 Sci. China Inf. Sci. 63 160407Google Scholar
[21] Zhong D Z, Zhao K K, Xu Z, Hu Y L, Deng W A, Hou P, Zhang J B, Zhang J M 2022 Opt. Express 30 36209Google Scholar
[22] Jiang L, Liang W Y, Song W J, Jia X H, Yang Y L, Liu L M, Deng Q X, Mou X Y, Zhang X 2022 IEEE J. Quantum Electron. 58 2400608Google Scholar
[23] Huang Y, Zhou P, Yang Y G, Cai D Y, Li N Q 2023 IEEE J. Sel. Top. Quantum Electron. 29 1700109Google Scholar
[24] Wang L T, Huang Z M 2004 Proc. SPIE 5281 619Google Scholar
[25] Wang L T, Wu W J, Fang N, Huang Z M 2005 Proc. SPIE 6021 60210SGoogle Scholar
[26] 方捻, 郭小丹, 王春华, 王陆唐, 黄肇明 2008 光学学报 28 128Google Scholar
Fang N, Guo X D, Wang C H, Wang L T, Huang Z M 2008 Acta Opt. Sin. 28 128Google Scholar
[27] 赵莉, 方捻, 王颖, 黄肇明 2009 光子学报 38 2449
Zhao L, Fang N, Wang Y, Huang Z M 2009 Acta Photon. Sin. 38 2449
[28] 方捻, 单超, 王陆唐, 黄肇明 2010 光电子∙激光 21 335Google Scholar
Fang N, Shan C, Wang L T, Huang Z M 2010 J. Optoelectron.∙Laser 21 335Google Scholar
[29] Nakayama J, Kanno K, Uchida A 2016 Opt. Express 24 8679Google Scholar
[30] Vandoorne K, Dierckx W, Schrauwen B, Verstraeten D, Baets R, Bienstman P, Van Campenhout J 2008 Opt. Express 16 11182Google Scholar
[31] Tanaka G, Yamane T, Héroux J B, Nakane R, Kanazawa N, Numata H, Dakano H, Hirose A 2019 Neural Networks 115 100Google Scholar
[32] Bueno J, Brunner D, Soriano M C, Fischer I 2017 Opt. Express 25 2401Google Scholar
[33] Hübner U, Abraham N B, Weiss C O 1989 Phys. Rev. A 40 6354Google Scholar
[34] Fang N, Qian R L, Wang S 2023 Opt. Express 31 35377Google Scholar
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