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Transmission Nonreciprocity in a Mutually Coupled Circulating Structure.

Bing He1, Liu Yang2, Xiaoshun Jiang3

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This summary is machine-generated.

Researchers demonstrate optical nonreciprocity in linear systems using coupled microcavities or fiber rings. This breakthrough achieves nonreciprocal light transmission without breaking Lorentz reciprocity, enabling optical isolation.

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Area of Science:

  • Photonics and Optics
  • Quantum Optics

Background:

  • Lorentz reciprocity was considered essential for nonreciprocal light transmission.
  • Linear optical systems were largely overlooked for achieving nonreciprocity.

Purpose of the Study:

  • To propose and demonstrate optical nonreciprocity in linear systems.
  • To achieve nonreciprocal light transmission without violating Lorentz reciprocity.

Main Methods:

  • Utilizing a structure of three mutually coupled microcavities or optical fiber rings.
  • Employing optical gain saturation in one cavity or asymmetric couplings between cavities.

Main Results:

  • Demonstrated nonreciprocal transmission of light fields from two different input ports.
  • Achieved nonreciprocity even with equal couplings and in a time-independent linear system.
  • Showcased the potential for optical isolation and approximate optical isolator operations.

Conclusions:

  • Optical nonreciprocity can be realized in linear systems without breaking Lorentz reciprocity.
  • The proposed coupled microcavity/fiber ring structure offers a novel approach to optical isolation.