Multi-frequency optical local oscillator generation device and method and communication system

The embodiment of the invention provides a multi-frequency optical local oscillator generation device and method and a communication system, and belongs to the field of microwave photons. The multi-frequency optical local oscillator generation device comprises a carrier modulation module, a photoelectric conversion module and a radio frequency configuration module, wherein the carrier wave modulation module comprises an in-phase quadrature IQ modulator, and the IQ modulator is used for being connected with a laser source so as to carry out quadrature modulation on optical carrier waves output by the laser source to obtain modulated optical signals; the photoelectric conversion module is connected with the carrier modulation module and is used for converting the modulated optical signal into an electric signal; the radio frequency configuration module is connected with the photoelectric conversion module and is used for configuring the electric signal into a plurality of radio frequency signals with preset fre