This technical publication describes how to compute coupled fields and coupling coefficients in the Advanced Systems Analysis Software (ASAP®) from Breault Research Organization (BRO). The emphasis of this document is on the steps necessary to compute coherent coupled fields and coupling coefficients in ASAP. A brief discussion is also included on some of the important issues in modeling physical optics phenomena that are found in telecommunication devices. The coupling calculation is illustrated in two realworld systems: a ball coupling lens, and an optical feedback system that produces narrow linewidths for dense wavelength division multiplexing (DWDM) applications. The methodology presented here serves as a general roadmap for performing other types of coupling calculations in ASAP.
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