Longitudinal modes competition in a micro ring laser subject to both a self and a cross optical feedback

The results show that the laser's output is determined according to the competition between the longitudinal modes which are enhanced by the different feedback. The undesired changes of the dynamical behavior of the laser due to the effect of the one feedback can be minimized using a second controlled feedback. The second feedback has been chosen with a short delay line so it can be integrated on the same chip with the laser. This approach allows to avoid the complex integration process of magneto-optic materials which are normally required for on-chip isolation. The fabrication of the delay line and the control of the strength and the phase of the proposed feedback are currently supported and offered using standard building blocks by several integrated optics foundries.