We have experimentally demonstrated an unbalanced in-line Sagnac interferometer-based multi-wavelength-switchable C+L-band erbium-doped fiber light source. Using this interferometer-based scheme, multi-wavelength operation of up to 27 laser lines with the signal-to-noise ratio over 27dB and 3.3-nm wavelength switching was demonstrated at room temperature by the proper control of the polarization controller. Again, the results to generate more than 150 lines and good power stabilly ≦27dB over 1525nm-1615nm have been experimentally demonstrated.
