Optical computing based on silicon photonics promises orders-of-magnitude improvements in computing speed and power efficiency. The technology is based on directing modulated infrared light into silicon “wires” called waveguides, producible using standard CMOS processes. A form of analog computing, joining two waveguides effectively combines two signals while on-chip modulators (modulating brightness) effectively multiply two signals. Together, optical MAC units can be formed. (Read our primer on optical computing here). However, while optical computing is ideal for accelerating linear operations like matrix multiplication, standard digital electronics are required for nonlinear operations, memory and control.
https://www.eetimes.com/optical-computing-chip-runs-hardest-math-problems-100x-faster-than-gpus/
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