Generation of Millimeter Waves with Fine Frequency Tunability Using Mach-Zehnder-Modulator-Based Flat Comb Generator
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概要
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We propose a method of the precise frequency tuning in millimeter wave (MMW) generation using a Mach-Zehnder-modulator-based flat comb generator (MZ-FCG). The MZ-FCG generates a flat comb signal where the comb spacing is exactly the same as the frequency of a radio-frequency signal driving the MZ-FCG. Two modes are extracted from the comb signal by using optical filters. One of them was modulated by a phase modulator, creating precisely frequency-controllable sidebands. In the experiment, typical phase modulation was used. By photomixing of the extracted two modes using a high-speed photodiode, MMW signals with precisely frequency-controllable sidebands are generated. By changing the modulation frequency, the frequency of MMW signals can be continuously tuned. In this scheme, there are two methods for the frequency tuning of MMW signals; one is a coarse adjustment which corresponds to the comb spacing, and the other is fine tuning by the phase-modulation. It was demonstrated that the intensity fluctuation of the upper sideband of the modulated MMW signal was less than 1dB, and the frequency fluctuation was less than the measurement resolution (300Hz).
著者
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Yasui Motoaki
National Institute Of Information And Communications Technology
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MOROHASHI Isao
National Institute of Advanced Industrial Science and Technology
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SAKAMOTO Takahide
National Institute of Information and Communications Technology
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Kawanishi Tetsuya
National Inst. Of Information And Technol. (nict) Tokyo Jpn
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HOSAKO Iwao
National Institute of Information and Communication Technology (NICT)
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IRIMAJIRI Yoshihisa
National Institute of Information and Communications Technology (NICT)
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YASUI Motoaki
National Institute of Information and Communications Technology (NICT)
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SAKAMOTO Takahide
National Institute of Information and Communications Technology (NICT)
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Sakamoto Takahide
National Institute of Information and Communication Technology
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HOSAKO Iwao
National Institute of Information and Communications Technology (NICT)
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MOROHASHI Isao
National Institute of Information and Communications Technology (NICT)
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