摘要
An effective method for the improvement of the characteristics of an erbium-doped L-band superfluorescent fiber source(SFS)is demonstrated using an unpumped erbium-doped fiber(EDF).With a suitable length of unpumped EDF section in the single-forward pumped configuration,broadening of the L-band spectral linewidth is achieved and the variation of mean wavelength versus pump power is eliminated.A mean wavelength stable L-band SFS with a spectral linewidth of 50.2 nm and an output power of 60.2 mW is obtained experimentally.The method of using unpumped EDF enables one to offer a stable and wideband L-band SFS with high flexibility and to overcome the shortcomings of the synchronous pumping technique.
基金
Supported by the National Natural Science Foundation of China under Grant No 61108019
the Fujian Provincial Natural Science Foundation of China under Grant No 2011J01368.
