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. 2018 Nov 19;8:17046. doi: 10.1038/s41598-018-35434-z

Figure 1.

Figure 1

The photonic random fibre laser system. Pictorial description of the 30 cm long erbium-doped RFL with a large number (~103) of specially-designed random fibre Bragg gratings inscribed in the core. The pump source was a semiconductor laser operating in the CW regime at 1480.0 nm. The multimode RFL emission peaks at 1540.0 nm. A rather extensive number of 150,000 spectra were collected at the excitation power above the RFL threshold, P/Pth = 2.92. Below the threhsold, a replica-symmetric prelasing phase sets in with non-turbulent behaviour. In contrast, at P/Pth = 2.92 the RFL system exhibits the coexistence of photonic RSB spin glass and turbulence-like behaviours in the distribution of intensity increments between successive spectra.