Single-mode large-mode area fiber amplifier with higher-order mode suppression and distributed passband filtering of ASE and SRS

Abstract

A Large-Mode Area (LMA) single-mode Ytterbium-doped fiber amplifier with distributed narrow passband filtering is demonstrated. The fiber passband is ~ 40nm wide and centered at 1070nm for efficient filtering of both short- and longwavelength Amplified Spontaneous Emission (ASE) as well as Stimulated Raman Scattering (SRS). The fiber design provides Higher-Order Mode (HOM) suppression and is polarization maintaining. It has a mode field diameter of 27μm and exhibits a slope efficiency of >60%.