Dear Experts,
I have an optical system (refractive telescope + some lenses) to couple a laser beam into a single-mode fiber. I currently want to tolerance my system, so that the coupling efficiency does not drop below a threshold.
Currently, I use as a tolerancing criterion RMS Wavefront or RMS Spot Radius with a Paraxial Focus compensator. This works fine, but I have the feeling that those criteria don’t model the fiber coupling very well. Fiber coupling efficiency drops sharply if the focus spot moves from the center position, even if I compensate the shift with “Align Receiver to Chief Ray” feature in the Fiber Coupling tool.
I have tried to use the Merit function with a FICL operator, but this makes tolerancing really slow and FICL does not allow “Align Receiver to Chief Ray” I.e. sometime a smaller (better) RMS Spot Radius has a worse fiber coupling efficiency.
Maybe somebody has an idea, how to model fiber coupling more efficient to make the right decisions in the tolerancing process.
Many thanks
Markus
Best answer by Jeff.Wilde
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