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Combination of ray-trace and diffraction modeling to describe coupling laser diodes to fibers and waveguides

We describe a design tool for analyzing coupling between laser diodes and waveguides. The calculation includes adding system aberration information from a ray trace to a diffraction calculation in order to estimate the distribution of light incident on the waveguide. The overlap integral is used to calculate coupling efficiency. A simple example is given that analyzes coupling from a single-mode laser diode to a single-mode fiber using a ball lens. Calculations are compared with experimental results.