表題番号：2023C-181
日付：2024/04/05
研究課題フォトニック結晶マッハツェンダ干渉計の研究
| 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 previous work, the novel silicon slow-light photonic crystal waveguide (PCW) in the perturbed kagome lattice was numerically demonstrated with high group index. In this study, this slow-light PCW has been used for a compact carrier-injection type electro-optic (EO) phase shifter in a 2 × 2 Si MZI optical switch. To achieve efficient light coupling with a Si strip waveguide, a step-taper PCW design was applied to the input/output regions of the PCW phase shifter. The step-tapers increases the transmittance of the PCW phase shifter by 9 dB. Assisted by the slow-light PCW in the perturbed kagome lattice with a high group index of 50, the phase shifter was designed in a compact size of 17.7 µm and required an extremely small half-wave voltage-length product of only 1.83×10−3 V∙cm. An extinction ratio of 13 dB or more within the 3.3-nm wavelength range with a low switching power of 305 µW was obtained through numerical calculation. Moreover, a switching operation was achieved with an on or off time of 8.9 ns or shorter.The design of the step-taper was presented at the 17th International collaborative Symposium on Information, Production and Systems (ISIPS 2023) and the performance of 2 × 2 Si MZI optical switch will be presented at the IEEE Silicon Photonics Conference 2024.