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High single-mode-yield multiple-wavelength DFB-laser arrays in the 1.55 m range

: Kreissl, J.; Troppenz, U.; Rehbein, W.; Hüttl, B.; Lenz, E.; Venghaus, H.; Fidorra, F.

Technische Universiteit Eindhoven, Inter-University Research Institute on Communication Technology: Basic Research and Applications -COBRA-:
27th European Conference on Optical Communication, ECOC. Vol. 5: Tutorials
Piscataway, NJ: IEEE Service Center, 2001
European Conference on Optical Communication (ECOC) <27, 2001, Amsterdam>
Fraunhofer HHI ()

Based 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 kL=1.5. To use the advantage of higher grating feedback with kL > 1.5 the single mode yield was improved by a tailored phase shift design.