Optics letters, Vol 13, page 728, septembre 1988
A simple formula is presented for the linewidth-power product of multielement laser diodes, under the condition that the active elements are submitted to the same field. The theory is particulalrly applicable to laser diodes incorporating two thin active layers of different composition. Such diodes can be moduled by two active conducttances in parrallel with a linear admittance. If the injected current exhibits full shot noise, the laser linewidth is given by the same expression as for a single active element , except that α and α2 must be replaced by their average values weighted by the injected bias currents, where α denotes that phase-amplitude coupling factor. The same result is applicable to conventional index-guided laser diodes.
LIEN VERS L’ARTICLE : MULTIELEMENT LASER-DIODE LINEWIDTH THEORY