A system for generating a synchronization control signal in order to synchronize a high-frequency signal with a frequency f Hf and a pulsed optical signal, comprising a high-frequency signal input for the high-frequency signal, comprising an input for the optical signal pulsed at a repetition rate f R, comprising an electro-optical amplitude modulator that has an optical input, a voltage input that is connected to a phase member of the amplitude modulator, and an optical output, comprising a phase shift regulator that has a regulator input and a regulator output at which the synchronisation control signal is output, comprising a phase shift mixer that has a high-frequency input, a local oscillator input, and an output, comprising a first and a second photodetector (31, 53) that have an optical input and an output, comprising an optical input connection that connects the input for the optical signal to the optical input of the electro-optical amplitude modulator, and comprising an input splitter that is arranged in the input connection in order to additionally output the optical signal at a branch of the input splitter, wherein the high-frequency signal input is connected to the voltage input of the electro-optical amplitude modulator, wherein the branch of the input splitter is connected to the optical input of the first photodetector, wherein the output of the first photodetector is connected to the local oscillator input of the phase shift mixer, wherein the optical output of the electro-optical amplitude modulator is connected to the optical input of the second photodetector, wherein the output of the second photodetector is connected to the high-frequency input of the phase shift mixer, and wherein the output of the phase shift mixer is connected to the regulator input of the phase shift regulator, characterized in that a first power divider that has an input, a first output, and a second output and a bias regulator that has a regulator input and a regulator output are provided, wherein the output of the second photodetector is connected to the input of the first power divider, wherein the first output of the first power divider is connected to the high-frequency input of the phase shift mixer, wherein the second output of the first power divider is connected to the regulator input of the bias regulator, and wherein the regulator output of the bias regulator is connected to a bias input of the electro-optical amplitude modulator, such that the signal output at the optical output of the electro-optical amplitude modulator is as constant as possible. comprising a high-frequency signal input for the high-frequency signal, comprising an input for the optical signal pulsed at a repetition rate f R, comprising an electro-optical amplitude modulator that has an optical input, a voltage input that is connected to a phase member of the amplitude modulator, and an optical output, comprising a phase shift regulator that has a regulator input and a regulator output at which the synchronisation control signal is output, comprising a phase shift mixer that has a high-frequency input, a local oscillator input, and an output, comprising a first and a second photodetector (31, 53) that have an optical input and an output, comprising an optical input connection that connects the input for the optical signal to the optical input of the electro-optical amplitude modulator, and comprising an input splitter that is arranged in the input connection in order to additionally output the optical signal at a branch of the input splitter, wherein the high-frequency signal input is connected to the voltage input of the electro-optical amplitude modulator, wherein the branch of the input splitter is connected to the optical input of the first photodetector, wherein the output of the first photodetector is connected to the local oscillator input of the phase shift mixer, wherein the optical output of the electro-optical amplitude modulator is connected to the optical input of the second photodetector, wherein the output of the second photodetector is connected to the high-frequency input of the phase shift mixer, and wherein the output of the phase shift mixer is connected to the regulator input of the phase shift regulator, characterized in that a first power divider that has an input, a first output, and a second output and a bias regulator that has a regulator input and a regulator output are provided, wherein the output of the second photodetector is connected to the input of the first power divider, wherein the first output of the first power divider is connected to the high-frequency input of the phase shift mixer, wherein the second output of the first power divider is connected to the regulator input of the bias regulator, and wherein the regulator output of the bias regulator is connected to a bias input of the electro-optical amplitude modulator, such that the signal output at the optical output of the electro-optical amplitude modulator is as constant as possible.