Multiwavelength ring laser composed of EDFAs and an arrayed-waveguide wavelength multiplexer

A novel configuration of an Er-doped fibre ring laser for simultaneous multiwavelength lasing is proposed. An arrayed-waveguide N*N wavelength multiplexer selects lasing wavelengths and forms plural ring laser cavities. Independently controllable four-wavelength lasing with a stable spacing of 1.6nm is demonstrated.