Journal
OPTO-ELECTRONIC ADVANCES
Volume 5, Issue 10, Pages -Publisher
CAS, INST OPTICS & ELECTRONICS, ED OFF OPTO-ELECTRONIC JOURNALS
DOI: 10.29026/oea.2022.210061
Keywords
all-optical integrated photonic circuit; inverse design; all-optical switch; all-optical XOR logic gate
Categories
Funding
- National Key Research and Development Program of China
- National Natural Science Foundation of China
- [2018YFB2200403]
- [11734001]
- [91950204]
- [92150302]
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This article introduces an all-optical integrated photonic circuit based on the inverse design method, which can achieve high density, ultrafast response, and ultra-low energy consumption. The circuit has small size, low crosstalk, and the ability to identify logic signal results.
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 pm x 7 pm, and that of a single device is 2 pm x 2 pm. The distance between two adjacent devices is as small as 1.5 pm, 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.
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