Millimeter-Wave-Band Electro-Optic Modulators for Microwave Photonic Applications

Recently, the optical modulation technology for millimeter-wave (MMW) signals becomes rather important owing to new MMW applications combined with photonic links: 5G/beyond-5G mobile front-haul, high-speed train communication systems, high-resolution radars, imaging for safety and security, and so on. The author has been trying to develop electro-optic modulators operating in MMW bands utilizing unique device structures. In this paper, several MMW-band optical modulators with advanced functions are discussed.