表題番号：2024C-509 日付：2025/04/04
研究課題マイクロリング共振器を用いた光積和演算回路の研究
研究者所属（当時） 資格 氏名
（代表者） 理工学術院 大学院情報生産システム研究科 准教授 高畑　清人
研究成果概要
In our laboratory, we reported a silicon-based photonic product-sum calculation circuit comprising cascaded micro-ring modulators (MRM) and a 4×1 multimode interferometer (MMI). In the numerical simulation, it has successfully output a correct calculation result with a multi-level analog signal. However, when several photonic signal processing steps are performed in series, it is very difficult for a processing part to recognize the incoming signal with the measure of light intensity from the former part.
To solve the problem, in this study, a novel design of silicon-based photonic product-sum calculation circuit with a 3-bit binary output is investigated. The output as a binary signal is suitable for multi-step signal processing. The proposed circuit comprises twenty MRMs and three optical couplers, and it is designed for 1550-nm wavelength band. For the detailed analysis of the circuit performance, the models of the MRM and passive components, such as an optical coupler, waveguide crossing, and bent waveguide, are built in the optical simulator. The static and dynamic performance of the MRM and the additional losses of the other components are evaluated. Then, the dynamic performance of the product-sum circuit is numerically analyzed at the input signal rate of 10 Mbit/s.
The proposed circuit can output a correct optical 3-bit binary signal corresponding to the product-sum calculation result with dynamic extinction ratios of over 3.5 dB and the insertion loss of 15.09 dB for 6-Vpp input signals. The results indicate that the proposed photonic product-sum calculation circuit has potential for future photonic convolutional neural network computing and signal processing, and it would expand the application fields of the photonic product-sum circuit.