Fig. 4

The 808 nm pump power distribution for 4-core fiber at the length of (a) 5 cm (Pabs = 4.95%), (b) 40 cm (Pabs = 40.56%), (c) 100 cm (Pabs = 56.82%) and for 11 core fiber at the length of (d) 5 cm (Pabs = 10.11%), (e) 40 cm (Pabs = 69.18%), (f) 100 cm (Pabs = 80.74%).