4.4 Article

Reservoir Computing Based on Mutually Injected Phase Modulated Semiconductor Lasers as a Monolithic Integrated Hardware Accelerator

Journal

IEEE JOURNAL OF QUANTUM ELECTRONICS
Volume 57, Issue 5, Pages -

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JQE.2021.3104855

Keywords

Semiconductor lasers; Phase modulation; Optical feedback; Laser feedback; Optical distortion; Forward error correction; Reservoirs; Optical communications; optical processing; phase modulation; lasers; injection-locked; optical neural systems

Funding

  1. Hellenic Foundation for Research and Innovation (HFRI) [2247]

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The paper proposes a neuromorphic computing scheme utilizing delay-based reservoir computing in a laser system with two mutually coupled phase modulated lasers, which can be monolithically integrated and performs well in dispersion compensation tasks. The scheme can recover severely distorted 25 Gbaud PAM-4 signals for transmission distances exceeding 50 km and outperforms other delay-based reservoir computing systems relying on optical feedback.
In this paper we propose and numerically study a neuromorphic computing scheme that applies delay-based reservoir computing in a laser system consisting of two mutually coupled phase modulated lasers. The scheme can be monolithic integrated in a straightforward manner and alleviates the need for external optical injection, as the data can be directly applied on the on-chip phase modulator placed between the two lasers. The scheme also offers the benefit of increasing the nodes compared to a reservoir computing system using either one laser under feedback or laser under feedback and optical injection. Numerical simulations assess the performance of the integrated reservoir computing system in dispersion compensation tasks in short-reach optical communication systems. We numerically demonstrate that the proposed platform can recover severely distorted 25 Gbaud PAM-4 signals for transmission distances exceeding 50 km and outperform other competing delay-based reservoir computing systems relying on optical feedback. The proposed scheme, thanks to its compactness and simplicity, can play the role of a monolithic integrated hardware accelerator in a wide range of application requiring high-speed real-time processing.

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