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

External Optical feedback can severely change the stability and the performance of semiconductor ring lasers. To reduce the undesired effect of the optical feedback, we propose to use a second feedback to stabilize the wavelength and the intensity of the ring laser even in the presence of undesired external reflections. In this work, we numerically investigate the dynamical behavior of the semiconductor ring laser when it is subject to two optical feedback simultaneously using a two-directional mode rate equation model. 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.

Publication year:2018

Keywords:Cross optical feedback, Integrated optical devices, Ring laser, Self optical feedback, Semiconductor laser

BOF-keylabel:yes

BOF-publication weight:10

CSS-citation score:1

Authors:Regional

Authors from:Higher Education

Accessibility:Closed