JPH05249525

PURPOSE:To facilitate the generation of microwaves signals of a wide frequency band and to enable the easy execution of the arbitrary phase control of microwaves regardless of an oscillation frequency by utilizing an electrooptical effect by using two wavelength variable semiconductor lasers. CONSTITUTION:The light beams emitted from the semiconductor lasers 12, 13 pass optical waveguides 14. An electrode 15 is provided on the one optical waveguide. A difference in the refractive index between the optical waveguides proportional to an impressed electric field is generated by the electrooptical effect of GaAs when the electric field is impressed into the optical waveguides from the outside. The microwave of the wavelength corresponding to the difference is then formed. The microwave can be controlled in the frequency over the wide band by changing the one implantation current of the lasers 12, 13. The arbitrary phase control is enabled regardless of the oscillation frequency by changing the intensity of the electric field in the electrode 15. In addition, the signal processing function of the microwave is possible as well as an MMIC is formed in the part in the middle 18 of a microstrip line 17.