Patent ID: 8064740

Claim:
An arrangement for the electro-optical control and fast modulation of THz transmitters and THz measuring systems, with this arrangement featuring at least two single mode semiconductor lasers with a relative wavelength difference in order to generate beat signals with the desired THz frequency, wherein at least one of said semiconductor lasers can be electrically tuned with respect to the wavelength, with the arrangement also featuring means for superimposing both laser waves and for generating superimposed beat signals at two outputs, wherein one beat signal at one output serves for controlling a THz transmitter and another beat signal at the other output serves for controlling a local oscillator in the THz receiver, and with the arrangement furthermore featuring at least one means for adjusting the relative phase correlation of the beat signals at the respective outputs for the THz transmitter and the local oscillator, characterized in that the at least one means for adjusting the phase correlation of the beat signals consists of an electrically controllable, semiconductor-based phase modulator ( 4 . 1 ) for the spectral range of a laser wave, wherein said phase modulator is arranged in an individual light path between one of the lasers ( 1 or 2 ) and the means (K 3 . 1 or K 3 . 2 ) for superimposing the two laser waves and able to electrically modulate the phase of the laser wave by at least π, and in that the two single mode semiconductor lasers ( 1 , 2 ) are connected to the means for superimposing the two laser waves (K 3 . 1 , K 3 . 2 ) and for generating the superimposed beat signals at the two outputs ( 6 , 7 ), as well as to the phase modulator ( 4 . 1 ), by means of waveguides ( 8 ) and compactly arranged on a chip ( 10 ) with a stable phase.