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We present a band selective amplified spontaneous emission (ASE) source of an erbium-doped fiber (EDF) which can operate in either the C- or the C+L-band region.The band selective ASE source is realized using the backward feedback technique with a I×2 0ptical switch in a bi-directional pumping configuration.The 25.9 mW C-band or 22.5 mW C+L-band ASE spectrum is alternately obtained merely by controlling the state of the optical switch.