2023 Fiscal Year Research-status Report
Photonic frequency converter for spectrally agile seamless access network in millimeter-wave band
| Project/Area Number |
22K04116
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| Research Institution | National Institute of Information and Communications Technology |
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Principal Investigator |
PHAM TIENDAT 国立研究開発法人情報通信研究機構, ネットワーク研究所フォトニックICT研究センター, 主任研究員 (50636321)
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| Co-Investigator(Kenkyū-buntansha) |
山口 祐也 国立研究開発法人情報通信研究機構, ネットワーク研究所フォトニックICT研究センター, 主任研究員 (30754791)
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| Project Period (FY) |
2022-04-01 – 2025-03-31
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| Keywords | radio over fiber / photonic down-conversion / fiber radio / optical communications |
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| Outline of Annual Research Achievements |
We developed a high-slope-efficiency Mach-Zehnder modulator (MZM) for direct conversion of sub-terahertz (sub-THz) signals to optical signals and measured its characteristics. Using the fabricated MZM modulator, we demonstrated a transparent fiber-sub-THz-fiber system in the 150-GHz band using photonic down-conversion technology for simultaneous detection and down-conversion of the signal to the microwave band. A newly developed high-extinction-ratio optical modulator was employed to generate pure two-tone optical signals with a frequency separation of up to 154 GHz for implementing the photonic down-conversion. Using the developed technologies, we successfully demonstrated the generation, transmission, reception, and down-conversion of 80-Gb/s orthogonal frequency-division multiplexing signal in the 151.5 GHz band.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
We successfully developed the key devices for this research, including an ultra-broadband optical modulator for sub-THz signal conversion of up to 300 GHz and high-extinction-ratio modulator for pure two-tone optical signal generation for photonic down-conversion. For the system demonstration, we successfully demonstrated the generation, transmission, reception, and down-conversion of sub-THz signals in above 100 GHz band using the developed devices and technologies. We also published the achieved results in high-impact journals, such as J. Light. Technol. and IEEE J. Sel. Top. Quantum Electron., and presented at the the top international conferences, such as ECOC 2023 and OFC 2024. The achievements in the second year made a great progress in obtaining the final targets of the research.
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| Strategy for Future Research Activity |
In the final year of the project, we will demonstrate the generation, transmission, reception, and down-conversion of sub-THz signal in a higher frequency band, such as the Y band (170-260 GHz) and G band (220-330 GHz). The system will be demonstrated for of different signals, including standard-compliant mobile signals and high-speed fixed wireless access signals.
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| Causes of Carryover |
We used the assigned budget for key devices and components. There was an amount of approximately 210,000 yen unused in FY 2023 because we could utilize the existing RF components in our Laboratory. In the FY 2024, we will buy some devices, such as RF and optical connectors and components, for system demonstration in the Y and G bands.
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