Photonics Research, Volume. 12, Issue 12, 2845(2024)

Experimental realization of a performance-enhanced reservoir computer based on a photonic-filter feedback laser

Yu Huang1,2, Penghua Mu3, Pei Zhou1,2,4, and Nianqiang Li1,2、*
Author Affiliations
  • 1School of Optoelectronic Science and Engineering & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, China
  • 2Key Laboratory of Advanced Optical Manufacturing Technologies of Jiangsu Province & Key Laboratory of Modern Optical Technologies of the Ministry of Education, Soochow University, Suzhou 215006, China
  • 3Institute of Science and Technology for Opto-Electronic Information, Yantai University, Yantai 264005, China
  • 4e-mail: peizhou@suda.edu.cn
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    Figures & Tables(6)
    (a) Decline of the brain’s memory over time. (b1) Multidelay feedback mechanism. Illustration of the time-domain system dynamics for (b2) single feedback scheme and (b3) multidelay feedback scheme. y0(t) is the original observed trajectory, y1(t)=y0(t+Δt) is the one time step shifted version of y0(t), y2(t)=y0(t+2Δt) is the two time step shifted version of y0(t), etc. Here, Δt indicates the single time-delay interval. (c) Conceptual scheme of time-delayed-based RC. (d) Experimental setup of the time-delay RC system based on the DFB laser with photonic-filter feedback. TL, tunable laser; PC, polarization controller; MZM, Mach–Zehnder modulator; PD, photodiode; EA, electric amplifier; VOA, variable optical attenuator; FC, fiber coupler; DL, delay line; AWG, arbitrary waveform generator; CIR, optical circulator; OSC, oscilloscope.
    Correlation dimension: the reservoir laser (a) with single feedback and (b) with photonic-filter feedback, where the parameters are J=18 mA, Pf=0.1 mW, and Pinj=0. (c) Optical spectra of the reservoir laser and the drive laser. (d) Optical spectra of the reservoir laser with single feedback or photonic-filter feedback.
    (a1), (d1) Temporal waveform of ideal (gray) and experimental (red) input signals S(t). Response output of reservoir laser with (a2), (d2) single feedback and (a3), (d3) photonic-filter feedback. Correlation plots between the input signal and response output generated from the reservoir laser with (b1), (e1) single feedback and (b2), (e2) photonic-filter feedback. (c1), (c3), (f1), (f3) Temporal waveforms of the origin signal (red), the prediction results (blue), and (c2), (c4), (f2), (f4) the error (blue) between the original signal and the prediction/classification results for the photonic-filter feedback scheme. Mackey–Glass time-series prediction results are shown on the left, and the NCE tasks are shown on the right. For clear observation, we display only the reconstructed signal spanning 200 ns in (f1) and (f3).
    (a1) Prediction error (NMSE) of the Mackey–Glass time-series prediction task, (b1) signal error rate (SER) of the NCE task, and (c1) memory capacity (MC) obtained from our proposed RC system as a function of feedback power for different coupling coefficient r. (a2) NMSE of the Mackey–Glass time-series prediction task and (b2) SER of the NCE task obtained from our proposed RC system as a function of feedback power for different node number N. (c2) Typical correlation function m(j) for the reservoir laser with single feedback (blue dashed line) and photonic-filter feedback (red solid line).
    Bifurcation diagram of the reservoir laser with (a1) single feedback and (a2) photonic-filter feedback, where r=0.1. (b1), (b2) Prediction error (NMSE) of the Mackey–Glass chaotic time-series task; (c1), (c2) signal error rate (SER) of the NCE task; (d1) correlation function m(j); and (d2), (d3) MC obtained from our proposed RC system in simulations. Note that the values of NMSE and SER in (b2) and (c2) are presented on a logarithmic scale. The white contour line represents the optimal result generated from the scenario of single feedback.
    • Table 1. Parameter Values Used in Simulations [44]

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      Table 1. Parameter Values Used in Simulations [44]

      ParametersSymbolsValues
      Linewidth enhancement factorα3.0
      Differential gain coefficientGN8.4×1013  m3s1
      Transparency carrier densityN01.4×1024  m3
      Photon lifetimeτp1.927 ps
      Carrier lifetimeτe2.04 ns
      Light velocityc3.0×108  ms1
      Center wavelengthλ1550 nm
      Laser angular frequencyω=2πc/λ1.23×1015  rad/s
      Bias voltage of MZMΦ00
      Detuning frequencyΔf–3.0 GHz
      Injection strengthkinj18.64  ns1
      Injection current densityJ1.00
      Gain compression factorε2.0×1023
      Injection field amplitude|ε0|1
      Injection current at lasing thresholdJth9.892×1032  m3s1
      Carrier density at lasing thresholdNth2.018×1024  m3
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    Yu Huang, Penghua Mu, Pei Zhou, Nianqiang Li, "Experimental realization of a performance-enhanced reservoir computer based on a photonic-filter feedback laser," Photonics Res. 12, 2845 (2024)

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    Paper Information

    Category: Optoelectronics

    Received: Jul. 11, 2024

    Accepted: Sep. 26, 2024

    Published Online: Nov. 27, 2024

    The Author Email: Nianqiang Li (wan_103301@163.com)

    DOI:10.1364/PRJ.535334

    CSTR:32188.14.PRJ.535334

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