【摘 要】
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Parity-time (PT) symmetry has attracted intensive research interest in recent years. PT symmetry is conventionallyimplemented between two spatially distributed
【机 构】
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Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications,Institute of Photoni
论文部分内容阅读
Parity-time (PT) symmetry has attracted intensive research interest in recent years. PT symmetry is conventionallyimplemented between two spatially distributed subspaces with identical localized eigenfrequencies and complementary gain and loss coefficients. The implementation is complicated. In this paper, we propose and demonstrate that PT symmetry can be implemented between two subspaces in a single spatial unit based on optical polarimetric diversity. By controlling the polarization states of light in the single spatial unit, the localized eigenfrequencies, gain, loss, and coupling coefficients of two polarimetric loops can be tuned, leading to PT symmetry breaking. As a demonstration, a fiber ring laser based on this concept supporting stable and single-mode lasing without using an ultranarrow bandpass filter is implemented.
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