The present application describes a multi wavelength apparatus. The apparatus includes a pump laser, a first seed laser and a second seed laser. Each of the first and second seed lasers had wavelengths longer than the pump laser. The apparatus also includes a first multiplexer. The apparatus also includes first and second controllers configured to respectively control outputs of the first and second seed lasers. The apparatus also includes a first fiber configured to receive an output of a first multiplexer. The apparatus also includes a second multiplexer configured to receive the output of the first fiber. The apparatus also includes a second fiber configured to receive the output of the second combiner. The second fiber can emit light at either the first seed wavelength or the second seed wavelength. The present application is also directed to a method for controlling an output of a laser apparatus.
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