Okhotnikov, O. G.Lobo Ribeiro, Antonio B.Salcedo, J. R.2019-09-162019-09-1619930003-6951http://hdl.handle.net/10284/7918An all‐fiber ring laser geometry in the form of a nonreciprocal S‐ring is presented and demonstrated. Its operation is demonstrated to allow unidirectional laser oscillation. The intensity ratio for laser oscillation in each of the two directions were measured, and found to be larger than 150. This value is the largest such ratio obtained for a ring laser without Faraday isolators.engjournal article10.1063/1.110341