Integrated Optical Circulator based on Radiatively Coupled Magnetooptic Waveguides
نویسندگان
چکیده
In a three-guide coupler with multimode central waveguide more than two modes of the entire structure participate in the coupling between the outer waveguides. Using a three mode approximation we found simple conditions for complete power transfer between the outer waveguides: the device length has to match certain multiples of the conventionally defined coupling length. The specific form of the relevant modes allows to design a magnetooptic isolator or circulator with significantly reduced device length (as compared to the conventional nonreciprocal coupler). The performance of the proposed devices is simulated by propagating mode calculations. Estimates for admissible fabrication tolerances for the layer thicknesses are presented.
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