The disclosed embodiments provide a system that implements a multiwavelength laser. This system includes a set of reflective semiconductor operational amplifiers (RSOAs) and a broadband loop mirror having an input and an output. The system also includes an arrayed waveguide grating (AWG) multiplexer having inputs that are coupled to outputs of the set of RSOAs, and having an output that feeds into the input of the loop mirror. During operation of the system, each RSOA in the set of RSOAs forms a wavelength-specific lasing cavity with a specific passband of the AWG multiplexer and the broadband loop mirror. The wavelength-specific laser signals produced by the wavelength-specific lasing cavities combine at the output of the loop mirror to produce a multiwavelength signal, which is emitted through an output of the system.
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