The basic indexes of all-optical integrated photonic circuits include high-density integration, ultrafast response and ultra-low energy consumption. Traditional methods mainly adopt conventional micro/nano-structures. The overall size of the circuit is large, usually reaches hundreds of microns. Besides, it is difficult to balance the ultrafast response and ultra-low energy consumption problem, and the crosstalk between two traditional devices is difficult to overcome. Here, we pro-pose and experimentally demonstrate an approach based on inverse design method to realize a high-density, ultrafast and ultra-low energy consumption integrated photonic circuit with two all-optical switches controlling the input states of an all-optical XOR logic gate. The feature size of the whole circuit is only 2.5 μm × 7 μm, and that of a single device is 2 μm × 2 μm. The distance between two adjacent devices is as small as 1.5 μm, within wavelength magnitude scale. Theoret-ical response time of the circuit is 150 fs, and the threshold energy is within 10 fJ/bit. We have also considered the crosstalk problem. The circuit also realizes a function of identifying two-digit logic signal results. Our work provides a new idea for the design of ultrafast, ultra-low energy consumption all-optical devices and the implementation of high-density photonic integrated circuits.

Huixin Qi;Zhuochen Du;Xiaoyong Hu;Jiayu Yang;Saisai Chu;Qihuang Gong

State Key Laboratory for Mesoscopic Physics&Department of Physics,Collaborative Innovation Center of Quantum Matter&Frontiers Science Center for Nano-optoelectronics,Beijing Academy of Quantum Information Sciences,Peking University,Beijing 100871,China;Peking University Yangtze Delta Institute of Optoelectronics,Nantong 226010,China;Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China

光电进展（英文版）

[1]Huixin Qi;Zhuochen Du;Xiaoyong Hu;Jiayu Yang;Saisai Chu;Qihuang Gong-.High performance integrated photonic circuit based on inverse design method)[J].光电进展（英文版）,2022(10):22-34

Theoret

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