Stable Dual Wavelength Emission From the Buried Heterostructure Laser Using Reflectivity Modification Method for Microwave Generation

We show that the stable dual mode emission, characterized by different polarization of the modes, requires the buried heterostructure (BH) laser to operate in the linear gain region above the threshold; however, not reaching the saturation levels. Additionally, the laser must operate in the weak coupling regime where the self-gain saturation coefficient must be larger than that of the cross-gain coefficient. Furthermore, the method of reflectivity modification has been applied to achieve the dual mode emission at much lower pump current values. The dual mode output is targeted towards the generation of microwave signals using the optical heterodyning method. Various practical issues, such as the implementation mechanism of this method, the impact of spontaneous emission, and the corresponding phase noise performance of the resultant microwave signal, are also discussed.