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Improving the modulation bandwidth in semiconductor lasers by passive feedback

: Radziunas, M.; Glitzky, A.; Bandelow, U.; Wolfrum, M.; Troppenz, U.; Kreissl, J.; Rehbein, W.


IEEE Journal of Selected Topics in Quantum Electronics 13 (2007), Nr.1, S.136-142
ISSN: 1077-260X
Fraunhofer HHI ()

We explore the concept of passive-feedback lasers (PFLs) for direct signal modulation at 40 Gb/s. Based on numerical simulation and bifurcation analysis, we explain the main mechanisms in these devices that are crucial for modulation at high speed. The predicted effects are demonstrated experimentally by means of correspondingly designed devices. In particular, a significant improvement of the modulation bandwidth at low-injection currents can be demonstrated.