Microwave Photonics  is an inter-disciplinary field of technology that deals with the interactions between microwave and optical waves for the generation, processing, control and distribution of microwave, millimeter-wave and THz-frequency signals. Microwave photonics is currently used in a wide variety of applications such as antenna remoting, optically-controlled phased-array antennas, optical processing of microwave signals and millimeter wave and THz signal generation. It enables new microwave functions such as fast spectrum analysis, low-phase-noise microwave and millimeter wave generation, high-frequency conversion, long true-time delay, probing and control of microwave devices and ultra-fast analog-to-digital converters. Conversely, microwave techniques enable new optical communication systems, with faster modulation and detection devices.