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We demonstrate a controllable dual-wavelength fiber laser which contains a master laser and a slave laser.The master laser is a kind of ring cavity laser which can be injected into by the slave laser.The output laser wavelength is controlled by injected power of the slave laser; both single- and dual-wavelength operation can be achieved.Under free running,the master laser generates 1064 nm laser output.Here the slave laser is a 1072 nm fiber laser.The 1064nm and 1072 nm laser coexist in output spectrum for relatively low injected power.Dual-wavelength and power-ratio-tunable operation can be achieved.If the injected power of the slave laser is high enough,the 1064nm laser is extinguished automatically and there is only 1072nm laser output.