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We recently reported on a new form of unidirectional lasing in a fully reciprocal kilometre long fiber ring cavity. It is a threshold like phenomenon where unidirectionality is triggered at full laser operation far above the laser threshold. Directionality is the consequence of asymmetric round trip loss, which arises due to differing nonlinear loss because of Raman scattering for the two directions. Asymmetry can be altered by seeding any direction at Stokes wavelengths to define the final direction of the laser. This was achieved by a simple straight cleaves at WDM outputs, used to tailor the excited spectrum.
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Muhammad Assad Arshad, Alexander Hartung, Matthias Jäger, "Induction and control of directionality in reciprocal fiber ring laser by simple fiber end face reflections," Proc. SPIE PC12865, Fiber Lasers XXI: Technology and Systems, PC1286505 (13 May 2024); https://doi.org/10.1117/12.3005266