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  1. We report the first observation of complex lasing transitions in a topological 1D Su-Schrieffer-Heeger active array. The effect of gain saturation nonlinearities and carrier dynamics on the edge-state is investigated both theoretically and experimentally. 
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  2. We report the first observation of Aharonov-Bohm-like topological suppression of optical tunneling in twisted multicore fibers. Experimental results show that this effect is insensitive to imperfections, nonlinearities and mode-mixing processes, in agreement with theoretical predictions. 
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