| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2017: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Outline of Final Research Achievements |
Mach-Zehnder modulators (MZMs) can operate in high-speed modulation and are generally used for optical communication systems. However, MZMs theoretically make nonlinear responses. Distortions induced by the nonlinearity may become a serious problem. The third-order intermodulation distortion (IMD3) cannot be removed by frequency filters. The IMD3 may affect the system performance. In this research, a new optical compensation method of the nonlinear distortion in electro-optic modulators was proposed. The IMD3 are optically suppressed by using two MZMs operating with frequency chirp modulation and its performance was successfully confirmed. We designed and fabricated the modulator with the single-chip structure and the single-input operation by integrating the two MZMs with the microwave power divider circuit. The IMD3 compensation operation was experimentally confirmed. The IMD3 component could be suppressed by more than 20 dB compared to the conventional MZM.
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