2023 Fiscal Year Final Research Report
Research on Electro-optic devices using multi-mode interference waveguides
| Project/Area Number |
20K04601
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 21060:Electron device and electronic equipment-related
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| Research Institution | University of Hyogo |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
佐藤 孝憲 北海道大学, 情報科学研究院, 准教授 (60835809)
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| Project Period (FY) |
2020-04-01 – 2024-03-31
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| Keywords | 多モード干渉光導波路 / 電気光学変調素子 / ニオブ酸リチウム / 光結合器 / 90°ハイブリッド / チタン拡散光導波路 |
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| Outline of Final Research Achievements |
Multimode interference (MMI) optical waveguide devices have been realized using Ti-diffused LN waveguides for the first time. Then, electro-optic modulators with new functions were proposed using multi-branch MMI optical couplers, and their operation was experimentally demonstrated. The main results include the design of a tunable 2 × 2 MMI optical coupler and the realization of a Mach-Zehnder modulator (MZM) with a high extinction ratio exceeding 50 dB and an optical single sideband (SSB) modulator with an excellent sideband suppression ratio using the MZM. In addition, a three-parallel interference optical modulator structure using 1 × 3 optical couplers was also proposed, and the operation of highly functional optical modulators such as an optical SSB modulator and an optical modulator capable of optical fiber dispersion compensation were demonstrated.
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| Free Research Field |
マイクロ波フォトニクス
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| Academic Significance and Societal Importance of the Research Achievements |
本研究では、今までなされてこなかったTi拡散LN光導波路を用いたMMI導波路素子技術を確立した．その技術を用いて，従来のY分岐光導波路では実現不可能な多分岐の光結合器を，電気光学効果を有するTi拡散LN導波路で初めて実現し，これらMMI結合器を用いて，従来にない高性能な光変調器を，非常にシンプルな構成で実現した．高速で低遅延の通信が求められる6Gなどの将来の通信システムなどにおいて，これら高機能な光変調器の利用が期待できる．
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