Why can some jumper wires still transmit signals normally after being tied in a knot? What kind of black technology is this?
This phenomenon of “transmitting signals normally even when tied in a knot” is not magic, but a very classic structural design breakthrough in optical engineering – Bend-Insensitive Fiber (BIF), usually compliant with the ITU-T\ G.657 standard.
Below, we reveal the working principles behind this “black technology” from the perspectives of physics and structural design.