What are the applications of coupled mode theory in optical communications?
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Coupled mode theory (CMT) has various applications in optical communications. It can be used to describe the mutual interactions between different propagation modes in waveguides and optical devices . CMT allows for the analysis of coupled waveguides by perturbation methods, which is useful for calculating important parameters such as coupling length and reflectivity . Additionally, CMT can be used to analyze the coupling of optical fields in waveguide structures, taking into account small changes in the structure . It is also applicable to the modeling and design of metasurfaces, providing an efficient tool for optimizing the design of optical devices based on multiple resonators . Furthermore, a generalized form of CMT, known as quasinormal coupled mode theory (QCMT), has been developed for complex scatterers, enabling accurate mode-based construction of scattering matrices .
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