Research on the Feasibility of Implementing Optical Isolators Based on Distributed Feedback Structures and Their Application in Optical Systems

To implement optical isolators based on diffraction gratings, structures with distributed feedback in the form of waveguides with diffraction gratings, used in DFB lasers, were considered. Bragg conditions, which form the basis for Bragg reflection, were examined, and a constructive comparison of the implementation of optical isolators based on diffraction and Bragg gratings was conducted. As a result, waveguides with embedded diffraction gratings were modeled, and a reflection spectrum graph was constructed. The simulation results demonstrate the potential of using asymmetric diffraction gratings in the development of new types of optical isolators, providing a higher degree of control over light propagation in integrated optical systems where back reflections of the signal can be critical.