Kreissl, J.J.KreisslTroppenz, U.U.TroppenzRehbein, W.W.RehbeinHüttl, B.B.HüttlLenz, E.E.LenzVenghaus, H.H.VenghausFidorra, F.F.Fidorra2022-03-092022-03-092001https://publica.fraunhofer.de/handle/publica/33902410.1109/ECOC.2001.988845Based on a DFB grating design we have developed a four wavelength laser array with excellent single mode operation and high power output. We could routinely stabilize a high level of single laser yield of about 90% and hence, array yields better than 60%. This was accomplished by a precise control of phase-shifted index gratings with kappa L = 1.5. To use the advantage of higher grating feedback with kappa L > 1.5 the single mode yield was improved by a tailored phase shift design.endiffraction gratingsdistributed feedback lasersgallium arsenideiii-v semiconductorsindium compoundslaser modeslaser stabilityquantum well laserssemiconductor laser arrayswaveguide lasershigh single-mode-yield multiple-wavelength dfb-laser arrays1.55 mu m rangedfb grating designfour wavelength laser arraysingle mode operationhigh power outputsingle laser yield stabilityphase-shifted index grating controltailored phase shift designridge waveguide lasersin1-xgaxas1-ypy strained layer multi-quantum well1.55 micronin1-xgaxas1-ypy621conference paper