Integrated dual wavelength lasers for milimeter wave generation

We have designed integrated dual-wavelength lasers in which an array waveguide grating is used as intra-cavity filter to allow lasing on two wavelengths within a common arm of the device. The devices have been designed with the purpose to exploit the beating of the two wavelengths on a photodiode in order to generate a 70GHz carrier wave. The use of a common SOA to amplify both wavelengths is promising for reducing the variations in frequency difference between the two operating laser modes. Both linear and ring configurations have been explored