| Budget Amount *help |
¥14,820,000 (Direct Cost: ¥11,400,000、Indirect Cost: ¥3,420,000)
Fiscal Year 2023: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2022: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2021: ¥7,280,000 (Direct Cost: ¥5,600,000、Indirect Cost: ¥1,680,000)
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| Outline of Final Research Achievements |
Improving security is an important challenge in communication systems that will support future smart society. We have studied physical layer encryption that utilizes quantum uncertainty of light to directly prevent signal interception in communication systems where optical fiber and radio wireless transmissions are converged. After short-reach fiber transmission using analog optical intensity modulation, the encrypted signal was generated at radio frequencies via direct detection. This encrypted signal is upconverted to a millimeter wave band for wireless communication. High-speed communications at gigabits per second or faster was achieved while quantitatively guaranteeing security of both optical and radio signals seamlessly. We also succeeded in simplifying the transmitter configuration, which is an achievement beyond the scope of the original research.
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