Vertical cavity surface emitting laser arrays that emit light at different wavelengths and that are suitable for wavelength multiplexed applications. Such arrays are beneficially produced using binary masks that control the thickness elements of a spacer, which in turn controls the wavelengths of light...http://www.google.es/patents/US6693934?utm_source=gb-gplus-sharePatente US6693934 - Wavelength division multiplexed vertical cavity surface emitting laser array
