Compact optical circulator based on a uniformly magnetized ring cavity

摘要: We propose a new class of compact integrated optical circulators providing large isolation level while maintaining straightforward technological feasibility. Their layout is based on nonreciprocal radial Bragg cavity composed concentric magneto-optical rings. The circulator ports are standard rib waveguides, butt-coupled to the by cutting through its outer device specifically designed for operation in uniform external magnetic field. Using coupled-mode description complete cavity/waveguide-port system, we explore rich behaviour presence varying levels direct port-to-port coupling. demonstrate numerically strongly miniaturized two-dimensional circulator, with total footprint less than (10λ)2, achieving 20-dB at telecom frequencies over bandwidth 130 GHz. found be very tolerant respect fabrication imperfections. finish an outlook three-dimensional versions proposed cavities.