An all-optical four port isolator has been demonstrated by the University of Science and Technology of China (USTC), without the use of magnetic fields. For the circulator (see diagram) the signal light incident from the ports 1, 2, 3 and 4, exits from the ports 2, 3, 4 and 1, respectively, constituting a 1-2-3-4-1 circular ...
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from Electronics Weekly https://www.electronicsweekly.com/news/research-news/optical-circulator-isolator-demonstrated-without-magnetic-bias-2018-05/
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