@ARTICLE{Krysicki_M._Passive_2019, author={Krysicki, M. and Salski, B. and Kopyt, P.}, volume={vol. 27}, number={No 3}, journal={Opto-Electronics Review}, pages={268-274}, howpublished={online}, year={2019}, publisher={Polish Academy of Sciences (under the auspices of the Committee on Electronics and Telecommunication) and Association of Polish Electrical Engineers in cooperation with Military University of Technology}, abstract={A new approach to passive electromagnetic modelling of coupled–cavity quantum cascade lasers is presented in this paper. One of challenges in the rigorous analysis of such eigenvalue problem is its large size as compared to wavelength and a high quality factor, which prompts for substantial computational efforts. For those reasons, it is proposed in this paper to consider such a coupled-cavity Fabry-Perot resonant structure with partially transparent mirrors as a two-port network, which can be considered as a deterministic problem. Thanks to such a novel approach, passive analysis of an electrically long laser can be split into a cascade of relatively short sections having low quality factor, thus, substantially speeding up rigorous electromagnetic analysis of the whole quantum cascade laser. The proposed method allows to determine unequivocally resonant frequencies of the structure and the corresponding spectrum of a threshold gain. Eventually, the proposed method is used to elaborate basic synthesis rules of coupled–cavity quantum cascade lasers.}, type={Article}, title={Passive synthesis rules of coupled-cavity quantum cascade lasers}, URL={http://journals.pan.pl/Content/115261/PDF/opelre_2019_27_3_268-274.pdf}, keywords={Quantum cascade lasers, Coupled cavities, Resonance characterization, Threshold gain, Lasers}, }