All-optical nonlinear activation functions based on germanium silicon hybrid integration

Hengkang Li; Jianji Dong

doi:10.1117/12.2602448

9 October 2021 All-optical nonlinear activation functions based on germanium silicon hybrid integration

Hengkang Li, Jianji Dong

Proceedings Volume 11894, Optoelectronic Devices and Integration X; 1189413 (2021) https://doi.org/10.1117/12.2602448
Event: SPIE/COS Photonics Asia, 2021, Nantong, JS, China

Conference Poster

Abstract

Optical neural networks (ONNs), a kind of neural network implemented by optical hardware, have attracted more and more attention due to their excellent performance. As a part of ONNs, nonlinear activation functions the key for ONN to achieve more various functions. The realization of nonlinear activation functions by optical hardware has become a research hotspot. Here, we propose and demonstrate an all-optical implementation of a nonlinear activation function, which utilizes the intrinsic absorption and the plasma dispersion effect of germanium at 1550nm. The one has a loss about 4db and a threshold power of 5.1mW, while the another has a loss around 11db and a threshold power of 56.2mW. This proves that our scheme has great potential for nonlinear activation functions.

Citation Download Citation

Hengkang Li and Jianji Dong "All-optical nonlinear activation functions based on germanium silicon hybrid integration", Proc. SPIE 11894, Optoelectronic Devices and Integration X, 1189413 (9 October 2021); https://doi.org/10.1117/12.2602448

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