Cladding-pumped Erbium-Ytterbium co-doped random fiber laser

An Erbium-Ytterbium co-doped random fiber laser (EYRFL) operating at 1550 nm is demonstrated for the first time. The laser cavity consists of a 5-m-long Er/Yb co-doped fiber and a 2-km-long single-mode fiber that provides random distributed feedback. We experimentally achieve 2.14 W of 1550 nm random lasing at 9.62W of 976 nm LD pump power. The laser exhibits a linear output with the slope efficiency as 20.7%. This work provides a promising way to boost the output power of 1.5μm random fiber laser.