Semiconductor laser device

Semiconductor laser device comprising a first resonator for resonating an optical resonator signal for providing an optical output signal at an output of said laser device, wherein said first resonator is arranged for selectively resonating at a plurality of discrete output wavelengths, and wherein said laser device further comprises a plurality of second resonators operatively connected to said first resonator, said plurality of second resonators being arranged for providing an optical feedback signal at a feedback wavelength to said first resonator for locking said first resonator into resonating at a selected output wavelength of said discrete output wavelengths, which selected output wavelength corresponds to said feedback wavelength for providing said optical output signal;

• wherein said plurality of second resonators is arranged for providing said optical feedback signal selectable at a plurality of feedback wavelengths;
• wherein said plurality of second resonators comprises a plurality of resonant cavities, wherein each of said resonant cavities is arranged for resonating at a cavity wavelength corresponding to at least one of said plurality of feedback wavelengths, said device further comprising means for selecting one of said plurality of resonant cavities for providing said optical feedback signal.