Novel compact magnetless isolator based on a magneto-optical garnet material

A compact magnetless isolator for optical communication systems based on a ring resonator with an outer layer made of silicon and inner magneto-optical material that does not require external magnet to keep its magnetization saturated is suggested. Three-dimensional computational simulations the device performed full-wave electromagnetic solver COMSOL Multiphysics show insertion loss isolation levels are about −1.9 dB −23 dB, respectively, thus confirming feasibility isolator. An analytical model temporal coupled-mode theory method has been formulated there good agreement between simulation results. Since it scheme permanent magnets or electromagnets as conventional isolators do, presented much more compact, footprint at least one order magnitude smaller in comparison other designs known from literature, this feature makes suggested ideal candidate circuits very high integration density. • new proposed. No magnetizing elements required. Footprint reduction by when compared typical isolators. Temporal Coupled-Mode Theory can be used evaluate performance