Happach, M.M.HappachFelipe, D. DeD. DeFelipeFriedhoff, V.N.V.N.FriedhoffIrmscher, G.G.IrmscherKresse, M.M.KresseKleinert, M.M.KleinertZawadzki, C.C.ZawadzkiBrinker, W.W.BrinkerMohrle, M.M.MohrleKeil, N.N.KeilHofmann, W.W.HofmannSchell, M.M.Schell2022-03-062022-03-062020https://publica.fraunhofer.de/handle/publica/26577810.1109/JLT.2020.2996131Optical feedback has an impact on the tunability of lasers. We created a model of a tunable distributed Bragg reflector (DBR) laser describing the effect of optical feedback from a constant reflector distance on the wavelength tuning. Theoretical and experimental results are in good agreement. A further discussion of the model sheds light on design rules to reduce the effect of optical feedback on the tuning behavior. We introduced a new parameter called mode loss difference (MLD) as a metric for the feedback tolerance of the tuning behavior. A large MLD indicates higher tolerance of the laser to cavity length variations.en621535journal article