[21p-211B-1~9] 4.2 Photonics Devices, Photonic Integrated Circuit and Silicon Phonics

▲ [21p-211B-1] [INVITED] Ultralow Latency Computation based on Integrated Nanophotonics

〇Masaya Notomi^1,2, Kengo Nozaki^1,2, Shota Kita^1,2, Akihiko Shinya^1,2, Tohru Ishihara³, Koji Inoue⁴ (1.NTT Basic Research Labs., 2.NTT Nanophotonics Center, 3.Kyoto Univ., 4.Kyushu Univ.)

Keywords:nanophotonics, optical computing

Moore’s law for CMOS computers is still continuing, but its near-future saturation is now being discussed. One of the serious saturations is about its latency. The computation delay for a CMOS transistor is already saturated above 10 ps, which will be problematic when ultralow-latency response is required for broad-band data streams, even with parallelization or pipe-line processing. We regard that optical circuits may serve as ultralow-latency computation circuits if they are small enough and tightly combined with electronic circuits. The former requires nanophotonic devices/circuits and the former requires OE/EO conversion with ultrasmall capacitance. In this talk, first, we present our recent achievement in ultrasmall-capacitance OE/EO conversions. Then, we show that if we adopt a certain type of logic (optical pass-gate logic), ultralow-latency computation will be possible using nanophotonic circuits. We show several examples including optical full-adders consisting of electro-optic switches and digital-to-analogue converters, Boolean logic circuits based on linear optic elements, verctor-matrix multiplication for neuromorphic computing.