What are the ways to distinguish optical fibers?

Color discrimination

Yellow represents single mode

Orange represents multi-mode

Jacket identification

50/125, 62.5/125 are multi-mode, and may be marked with mm

9/125 (g652) is single mode and may be marked with sm

Fiber polished end

Can be distinguished under a magnifying glass, multi-modes are concentric circles

There is a black dot in the middle of the single mode

The splicer can be distinguished from the screen when splicing

No white strips in the middle of the multimode fiber

There is a white bar in the middle of the single mode

At the same time, the fusion splicer does not calculate the splice loss for multimode optical cables. Furthermore, single-mode and multi-mode fiber fusion splicers cannot be spliced.