Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 35, Issue 19, Pages 4247-4259Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2017.2714263
Keywords
Coupled mode analysis; integrated optics; optical resonators; optical waveguides
Funding
- Villum Fonden [00008692] Funding Source: researchfish
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Light propagation in systems of optical cavities coupled to waveguides can be conveniently described by a general rate equation model known as (temporal) coupled mode theory (CMT). We present an alternative derivation of the CMT for optical cavity-waveguide structures, which explicitly relies on the treatment of the cavity modes as quasi-normal modes with properties that are distinctly different from those of the modes in the waveguides. The two families of modes are coupled via the field equivalence principle to provide a physically appealing yet surprisingly accurate description of light propagation in the coupled systems. Practical application of the theory is illustrated using example calculations in one and two dimensions.
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