Optimum configuration and design of L-band erbium-doped superfluorescent fiber source

This paper investigates the design and optimum configuration of 1480 nm pumped high-power L-hand (1570-1610 nm) erbium-doped superfluorescent fiber Sources (SFSs). These broadband incoherent sources may find important applications in such areas as sliced wavelength-division multiplexed (WDM) local-access networks, characteristic measurement for dense WDM components, laser spectroscopy, and fiber-optic Sensor systems. We theoretically investigated and compared the characteristics of SFSs in terms of the mean wavelength, output power. and for various, configurations', forward (SPF). sin.-le-pass backward ISM, double-pass forward (DPF). and double-pass backward (DPB) structures, Among these configurations, the DPF scheme offered the highest output power with a good flat spectrum for an L-hand fiber source. Both SPF and SPB configurations failed to implement the L-band SFSs. Though the DPB configuration could offer L-band SFS output power, the flat spectrum profile was difficult to establish. The results of this may provide the configuration selection and design criteria of L-band erbium-doped SFSs.