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Effect of Optical Feedback on the Wavelength Tuning in DBR Lasers

Happach, Magnus; de Felipe, David; Friedhoff, Victor Nicolai; Irmscher, Gelani; Kresse, Martin; Kleinert, Moritz; Zawadzki, Crispin; Brinker, Walter; Mohrle, Martin; Keil, Norbert; Hofmann, Werner; Schell, Martin

Optical 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.
Published in: Journal of Lightwave Technology, 10.1109/jlt.2020.2996131, IEEE