Abstract
A novel double-pass forward L-band erbium-doped superfluorescent fibre source (SFS) with a segment of unpumped fibre between the reflector and the wavelength division multiplexing (WDM) coupler is presented. The effects of the fibre length arrangement on the output characteristics of the L-band SFS are simulated. The spectral bandwidth is broadened and the conversion efficiency is enhanced by optimizing the fibre length ratio of the unpumped section to the total erbium-doped fibre. A broadband L-band SFS is obtained experimentally, with a 3 dB bandwidth of 46 nm, a power ripple less than 1 dB, and an output power of 23.6 mW.
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