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A tunable nonreciprocal device is presented based on PT symmetry. This device structure is composed of two pairs PT symmetry ring. Signal λ1 is only transmitted in the forward direction, while another signal λ2 is transmitted in the backward direction. The signal channel spacing can also be controlled.
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Jianfei Jiang, Xiaoqing Jiang, Hui Yu, Xia Li, "A tunable nonreciprocal device based on PT symmetry ," Proc. SPIE 10152, High Power Lasers, High Energy Lasers, and Silicon-based Photonic Integration, 101520O (19 October 2016); https://doi.org/10.1117/12.2246471