Transmission Nonreciprocity in a Mutually Coupled Circulating Structure

Abstract

Breaking Lorentz reciprocity was believed to be a prerequisite for nonreciprocal transmissions of light fields, so the possibility of nonreciprocity by linear optical systems was mostly ignored. We put forward a structure of three mutually coupled microcavities or optical fiber rings to realize optical nonreciprocity. Although its couplings with the fields from two different input ports are constantly equal, such system transmits them nonreciprocally either under the saturation of an optical gain in one of the cavities or with the asymmetric couplings of the circulating fields in different cavities. The structure made up of optical fiber rings can perform nonreciprocal transmissions as a time-independent linear system without breaking Lorentz reciprocity. Optical isolation for inputs simultaneously from two different ports and even approximate optical isolator operations are implementable with the structure.

arXiv comment6 pages and 4 figures. The resolutions of the figure files are lowered, and the supplementary materials are not included, due to the upload limit imposed by ArXiv

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• Nonreciprocal Elasticity
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• Gain-Loss Coupled Systems
• Static synthetic gauge field control of double optomechanically induced transparency in a closed-contour interaction scheme
• How to Synthesize Exceptional Points with Three Resonators
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• Topological Mechanics of Micromorphic Metamaterials
• Mechanical activity and odd elasticity of passive, 2D chiral metamaterials
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