Programmable chalcogenide-based all-optical deep neural networks.

ABSTRACT: We demonstrate a passive all-chalcogenide all-optical perceptron scheme. The network's nonlinear activation function (NLAF) relies on the nonlinear response of Ge₂Sb₂Te₅ to femtosecond laser pulses. We measured the sub-picosecond time-resolved optical constants of Ge₂Sb₂Te₅ at a wavelength of 1500 nm and used them to design a high-speed Ge₂Sb₂Te₅-tuned microring resonator all-optical NLAF. The NLAF had a sigmoidal response when subjected to different laser fluence excitation and had a dynamic range of -9.7 dB. The perceptron's waveguide material was AlN because it allowed efficient heat dissipation during laser switching. A two-temperature analysis revealed that the operating speed of the NLA

SUBMITTER: Teo TY 

PROVIDER: S-EPMC11501810 | biostudies-literature | 2022 Sep

REPOSITORIES: biostudies-literature