Feedback Sensitivity of Detuned DBR Semiconductor Lasers
IEEE J. Quantum Electron., vol. 57, no. 5, pp. 2100107 (2021).
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A distributed Bragg reflector (DBR) laser represents a simple realization of a semiconductor laser operating in a single longitudinal mode. We present a so far missing theoretical study how its reflection tolerance depends on the detuning between lasing wavelength and maximum of the DBR reflectivity. The generic Lang-Kobayashi equations for lasers subject to optical feedback are extended to include the detuning parameter on base of the round-trip condition for stationary states. As a consequence, a well established formula for estimating the feedback tolerance is modified for detuned DBR lasers, too. Bifurcation analysis of the Lang-Kobayashi equations confirms the modified formula. Properly adapting the parameters of the DBR, the calculations yield a possible tolerance of the simple DBR laser against nearly 100% feedback.
1 Department of Physics, Technical University of Moldova, 2004 Chisinau, Moldova
2 Ferdinand-Braun-Institut gGmbH, Leibniz Institut für Höchstfrequenztechnik (FBH), 12489 Berlin, Germany
Distributed Bragg reflector, laser, external feedback, Lang-Kobayashi equations, stability.