High-efficiency and -stability L-band erbium-doped superfluorescent fiber source

A novel one-stage configuration for high stability L-band (1565-1605nm) erbium-doped superfluorescent fiber source (SFS) is designed and investigated. The superfluorescent source is realized in a 19m erbium-doped fiber with double-pass bi-directional pumping configuration. High pumping conversion efficiency and pump power insensitive mean wavelength characteristic due to the bi-directional pumping configuration. Pumping conversion efficiency about 60% and flat spectral linewidth over 30 nm is obtained by the proposed SFS.