Fig. 8From: Transient replica symmetry breaking in Brillouin random fiber lasersMode density manipulation in BRFLs. The spectra of beat signal within 1000Â ms with the total fiber length of a 1.5Â km, b 9Â km, c 15Â km, and d 20Â km; e Histogram of the quantity of random modes; f average mode during and mode hopping frequency with respect to the fiber length of the BRFLBack to article page