研究目的
Investigating the signal conversion from 28 GHz-band wireless to optical signals and transfer over optical fiber for 5G mobile systems.
研究成果
The 28 GHz-band wireless signal conversion and transfer over optical fiber were successfully demonstrated, with sufficient operational bandwidth and signal-to-noise ratio for data transfer of >1 Gb/s, making it suitable for 5G mobile applications.
研究不足
The study focuses on the 28 GHz-band and may require further optimization for other frequency bands. The application to Giga-bit ethernet links is still underway.
1：Experimental Design and Method Selection:
The study involved designing an antenna-coupled electrode LiNbO3 electro-optic modulator for effective wireless-optical signal conversion in the 28 GHz-band. Theoretical models and 3-D electromagnetic field analysis software (HFSS ver. 14.0) were used for design and analysis.
2：0) were used for design and analysis. Sample Selection and Data Sources:
2. Sample Selection and Data Sources: A 50-μm-thick LiNbO3 film attached onto a SiO2 glass base substrate was used. Optical waveguide was fabricated on the reverse side of the LiNbO3 film using the Ti-indiffusion method.
3：List of Experimental Equipment and Materials:
Standard gain horn antenna of +20 dBi, high-speed photo-detector, optical fiber amplifier, and a 4-km long silica fiber for signal conversion.
4：Experimental Procedures and Operational Workflow:
The modulator's performance was tested by irradiating a 29.5 GHz-band wireless signal and measuring the optical spectrum and frequency response. The phase-modulated signal was converted to an intensity modulated signal using a silica fiber.
5：5 GHz-band wireless signal and measuring the optical spectrum and frequency response. The phase-modulated signal was converted to an intensity modulated signal using a silica fiber. Data Analysis Methods:
5. Data Analysis Methods: The signal-to-noise ratio and frequency dependence of the re-converted signal were analyzed to verify the modulator's performance.
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LiNbO3 film
Used as the electro-optic material in the modulator for wireless-optical signal conversion.
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SiO2 glass base substrate
Base substrate for attaching the LiNbO3 film.
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standard gain horn antenna
Used for irradiating the wireless signal to the modulator.
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high-speed photo-detector
Used for detecting the converted intensity modulation signal.
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optical fiber amplifier
Used to improve the re-converted signal power level.
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silica fiber
Used for converting phase modulation signals to intensity modulation signals.
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