Magnetic Optical Circulator
An optical circulator is a three- or four-port designed such that entering any port exits from the next. This means that if light enters port 1 it is emitted from port 2, but if some of the emitted light is reflected back to the circulator, it does not come out of port 1 but. Starting from the analysis of a model circularly symmetric cavity, we show how to obtain a significant splitting of the eigenfrequencies of the two counterrotating cavity modes without intro-ducing subdomains magnetized in opposite directi ns. By locally switching the direction of the magnetic field on chip, we can dynamic es nators; (230 o integrate in photonic integrated circuits. They are widely used in WDM networks, opt cal amplifiers, and optical sensing systems.
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