1. The frequency band of optical fiber is very wide, theoretically up to 3 billion megahertz.
Although the optical fiber has different losses of light at different frequencies, which affects the bandwidth, the bandwidth in the lower loss area can reach 30,000 GHz. At present, the bandwidth of a single light source occupies only a small part of it (the frequency band of a multi-mode fiber is about several hundred megahertz, and a good single-mode fiber can reach more than 10 GHz). Adopting advanced coherent optical communication can arrange 2,000 light in the range of 30,000 GHz. Carriers, performing wavelength division multiplexing, can accommodate millions of channels.
2. Uninterrupted length is tens to 100, while ordinary copper wire (data line) is only a few hundred meters.
Currently, practical optical fibers are made of high-purity quartz (SiO2) material. At a wavelength of 1550nm, the attenuation can be reduced to 0.2dB / KM, which is close to the theoretical limit. Therefore, its interruption distance can be very long.
3. The optical fiber is not affected by electromagnetic fields and electromagnetic radiation, that is, there is no interference.
Because the optical fiber is a non-metallic dielectric material, its basic component is quartz (SiO2), which only transmits light, does not conduct electricity, and is not affected by the electromagnetic field. The optical signal transmitted in it is not affected by the electromagnetic field. 2. Industrial interference has a strong resistance ability, so it is not affected by electromagnetic waves.
4. Light weight and small size.
Because the optical fiber is very thin, the core diameter of single-mode optical fiber is generally 4um ~ 10um, and the outer diameter is only 125um. With the waterproof layer, reinforcing ribs, sheath, etc., the diameter of the optical cable composed of 4 ~ 48 fibers is less than 13mm It is much smaller than the standard coaxial cable with a diameter of 47mm. In addition, the optical fiber is glass fiber and the specific gravity is small, which makes it have the characteristics of small diameter and light weight, and it is very easy to install.
