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We report an actively tunable topological edge mode laser in aone-dimensional Su-Schrieffer-Heeger (SSH) laser chain, where the SSH chain isrealized in an electrically-injected Fabry-Perot (FP) laser chain. Anon-Hermitian SSH model is developed to investigate the SSH laser chain withtunable active topological defect. We theoretically demonstrate topologicaledge mode phase transition in the SSH laser chain. The phase transitionmanifested in the tight binding SSH laser chain is observed experimentally andagreed well with the theoretical predictions. Finally, by electronically tuningthe gain and loss, a lossy topological mode is obtained, and lasing isexperimentally observed in the lossy time-reversal configuration. This workpresents a versatile platform to investigate novel concepts, such astopological mode, for main stream photonic applications.

Electrically Tunable and Reconfigurable Topological Edge State Lasers