Two joined step index fibers are perfectly aligned. What is the coupling loss of numerical aperture are NAR= 0.26 for emitting fiber?

Question

Quizplus · Accepted Answer

When two joined step index fibers are perfectly aligned, and only the numerical aperture (NA) is given for the emitting fiber, without any mismatch in core diameters or refractive indices, the theoretical coupling loss due to the NA mismatch alone is negligible. Hence, the closest answer indicating minimal to no loss is -0.010 dB.

Two Joined Step Index Fibers Are Perfectly Aligned