Optical fiber wire do not require a shielding layer because optical fibers are optical signals that cannot be disturbed by electromagnetic waves.
Optical fiber is a technology that uses glass as a wave guide to transmit information from one end to the other in the form of light. The advantages of optical fiber transmission, high sensitivity, and no interference from electromagnetic noise, so no shielding layer is needed.
Optical fiber transmission has the advantages of small attenuation, wide frequency band, strong anti-interference, high safety performance, small size and light weight, so it has incomparable advantages in long-distance transmission and special environment.
The transmission medium is an important factor in determining the transmission loss, which determines the distance required for the transmission of the signal, and the optical fiber as the transmission medium of the optical signal has the characteristics of low loss.
The frequency band of the optical fiber can reach above 1.0 GHz, and the bandwidth of the general image is only 8 MHz. The image of one channel is more than enough to transmit with one core fiber, and it is more advantageous in transmitting voice, control signal or contact signal.