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A Multiple-Input Strategy to Efficient Integrated Photonic Reservoir Computing

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Abstract

Photonic reservoir computing has evolved into a viable contender for the next generation of analog computing platforms as industry looks beyond standard transistor-based computing architectures. Integrated photonic reservoir computing, particularly on the silicon-on-insulator platform, presents a CMOS-compatible, wide bandwidth, parallel platform for implementation of optical reservoirs. A number of demonstrations of the applicability of this platform for processing optical telecommunication signals have been made in the recent past. In this work, we take it a stage further by performing an architectural search for designs that yield the best performance while maintaining power efficiency. We present numerical simulations for an optical circuit model of a 16-node integrated photonic reservoir with the input signal injected in combinations of 2, 4, and 8 nodes, or into all 16 nodes. The reservoir is composed of a network of passive photonic integrated circuit components with the required nonlinearity introduced at the readout point with a photodetector. The resulting error performance on the temporal XOR task for these multiple input cases is compared with that of the typical case of input to a single node. We additionally introduce for the first time in our simulations a realistic model of a photodetector. Based on this, we carry out a full power-level exploration for each of the above input strategies. Multiple-input reservoirs achieve better performance and power efficiency than single-input reservoirs. For the same input power level, multiple-input reservoirs yield lower error rates. The best multiple-input reservoir designs can achieve the error rates of single-input ones with at least two orders of magnitude less total input power. These results can be generally attributed to the increase in richness of the reservoir dynamics and the fact that signals stay longer within the reservoir. If we account for all loss and noise contributions, the minimum input power for error-free performance for the optimal design is found to be in the ≈1 mW range.

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Acknowledgments

This research was funded by the EU Horizon 2020 PHRESCO Grant (Grant No. 688579) and the BELSPO IAP P7-35 program Photonics@be.

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  1. Ghent University - imec, Technologiepark Zwijnaarde 15, 9052, Ghent, Zwijnaarde, Belgium

    Andrew Katumba, Matthias Freiberger, Peter Bienstman & Joni Dambre

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  1. Andrew Katumba
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  2. Matthias Freiberger
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  3. Peter Bienstman
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  4. Joni Dambre
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Correspondence to Andrew Katumba.

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Katumba, A., Freiberger, M., Bienstman, P. et al. A Multiple-Input Strategy to Efficient Integrated Photonic Reservoir Computing. Cogn Comput 9, 307–314 (2017). https://doi.org/10.1007/s12559-017-9465-5

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  • DOI: https://doi.org/10.1007/s12559-017-9465-5

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