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Can the fiber be bent? How much can I bend? While understanding this issue, we need to understand the principle of fiber transmission.
Have you ever experienced WIFI suddenly broken, have you experienced repeated restarts, still feel that the speed card is slow? The reason for these problems is that in addition to the router itself, there may be problems with your fiber optic cable.
The propagation of light in an optical fiber is mainly based on the principle of total reflection. When the vertical ray end of the ray is incident and coincides with the fiber axis, the light travels forward along the axis. If you bend too much, it will cause some of the light to fail to pass normally, which will cause the optical power to drop, resulting in poor quality. The speed is slow.
A certain degree of large-angle bending leads to an increase in the loss of the optical fiber, a reduction in the signal-to-noise ratio, and a small signal-to-noise ratio, and the bandwidth may be small (actually, the number of broken packets increases, and the number of retransmissions increases).
Under normal circumstances, when the fiber is long, it can be folded into a ring and then tied together, but the diameter of the circle should not be too small, so as to avoid the excessive curvature, the light signal can not be refracted and transmitted to the opposite end. Generally, the diameter should not be smaller. 10 cm (that is, a radius of 5 cm) is appropriate, remember not to fold in half.
Radiation loss due to fiber bending
The fiber is soft and can be bent, but after bending to a certain extent, although the fiber can guide light, it will change the transmission path of light. The transmission mode is converted into a radiation mode, so that a part of the light energy penetrates into the cladding layer or passes through the cladding layer to become a radiation mode and is leaked outward, thereby causing loss. When the bending radius is larger than 5 to 10 cm, the loss caused by the bending is negligible.
Usually we see all the fiber optic cables wrapped in white skin. After the fiber is put into the house, the technician will roll these white fiber cables and tell you that this is the fiber optic cable. You can't fold it. Place it in a hidden place. Don't touch it. Although, generally, you won't listen carefully, but this is by no means an alarmist. If you accidentally touch it while moving items near the fiber, it will cause fiber breakage and affect the speed of the network.