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What is optical fiber ? The optical fiber is an abbreviation for optical fiber and consists of a thin glass fiber having a diameter of about 0.1 mm. It is transparent and slender. Although it is thinner than hair, it has a waveguide structure that encloses light and propagates in the axial direction. Optical fiber communication is developed because of this magical structure of optical fiber, which uses light waves as the carrier frequency, and optical fiber as a communication medium for transmission media.
[Introduction]
At present, the wavelength range of light waves used in optical communication is in the near-infrared region, and the wavelength is 0.8 to 1.8 um. Can be divided into short wavelength segments (0.85um) and long wavelength segments (1.31um and 1.55um). Because optical fiber communication has a series of excellent characteristics, the development speed of optical fiber communication technology is extremely rapid in recent years. It can be said that this emerging technology is an important symbol of the world's new technology revolution, and it is also a major transmission tool for various information networks in the future information society. In summary, optical fiber communication has the following advantages: transmission frequency bandwidth, large communication capacity, low loss, no electromagnetic interference, fine wire diameter, light weight, and abundant resources.
The three system architectures of fiber access networks are FTTN, FTTC, and FTTH. In the process of network development, each structure has its own application advantages. In the process of network evolution towards full service, each structure is a key link. The benefit FTTN brings to people is that it further pushes fiber to the user network. It establishes an access platform that can provide voice, high-speed data and video services to numerous homes without the need to completely re-establish access loops and distribute networks. According to requirements, a plug-in can be added at the fiber node to provide the required services. Before moving fiber nodes to roadside FTTCs or homes (FTTHs) due to business drivers or network reconstruction, FTTNs will overlay and utilize existing copper wire distribution networks.
The basic requirement of this kind of network structure is to provide broadband data services and video services, and the distance between nodes and houses should be in the range of 4,000 to 5,000 feet. Today's nodes typically have service distances of up to 12,000 feet. Therefore, each service area needs to set 3 to 5 FTTN nodes.
[Main advantages of optical fiber access communication]
(1) Large capacity. The operating frequency of the optical fiber is 8-9 orders of magnitude higher than the operating frequency of the current cable, so the developed capacity is large.
(2) Small attenuation. The attenuation per kilometer of optical fiber is more than an order of magnitude lower than the attenuation per kilometer of the current communication coaxial cable.
(3) Small size and light weight. It is also conducive to construction and transportation.
(4) Good anti-interference performance. The optical fiber is not subject to strong electrical interference, electrical signal interference, and lightning interference, and has strong anti-electromagnetic pulse immunity and good confidentiality. (5) It saves nonferrous metals. General communication cables consume a large amount of non-ferrous metals such as copper, lead or aluminum. The optical fiber itself is non-metal, and the development of optical fiber communication will save the country a lot of non-ferrous metals.
(6) Easy expansion. A standard fiber-optic line with a bandwidth of 2Mbps can easily be upgraded to 4M, 10M, 20M and up to 100Mbps without any equipment replacement.
Xiaobian conclusion: After reading the above introduction, I believe we have a more in-depth understanding of what optical fiber is , I hope to be helpful to everyone. For more information, please continue to pay attention to this site information platform.
[Introduction]
At present, the wavelength range of light waves used in optical communication is in the near-infrared region, and the wavelength is 0.8 to 1.8 um. Can be divided into short wavelength segments (0.85um) and long wavelength segments (1.31um and 1.55um). Because optical fiber communication has a series of excellent characteristics, the development speed of optical fiber communication technology is extremely rapid in recent years. It can be said that this emerging technology is an important symbol of the world's new technology revolution, and it is also a major transmission tool for various information networks in the future information society. In summary, optical fiber communication has the following advantages: transmission frequency bandwidth, large communication capacity, low loss, no electromagnetic interference, fine wire diameter, light weight, and abundant resources.
The three system architectures of fiber access networks are FTTN, FTTC, and FTTH. In the process of network development, each structure has its own application advantages. In the process of network evolution towards full service, each structure is a key link. The benefit FTTN brings to people is that it further pushes fiber to the user network. It establishes an access platform that can provide voice, high-speed data and video services to numerous homes without the need to completely re-establish access loops and distribute networks. According to requirements, a plug-in can be added at the fiber node to provide the required services. Before moving fiber nodes to roadside FTTCs or homes (FTTHs) due to business drivers or network reconstruction, FTTNs will overlay and utilize existing copper wire distribution networks.
The basic requirement of this kind of network structure is to provide broadband data services and video services, and the distance between nodes and houses should be in the range of 4,000 to 5,000 feet. Today's nodes typically have service distances of up to 12,000 feet. Therefore, each service area needs to set 3 to 5 FTTN nodes.
[Main advantages of optical fiber access communication]
(1) Large capacity. The operating frequency of the optical fiber is 8-9 orders of magnitude higher than the operating frequency of the current cable, so the developed capacity is large.
(2) Small attenuation. The attenuation per kilometer of optical fiber is more than an order of magnitude lower than the attenuation per kilometer of the current communication coaxial cable.
(3) Small size and light weight. It is also conducive to construction and transportation.
(4) Good anti-interference performance. The optical fiber is not subject to strong electrical interference, electrical signal interference, and lightning interference, and has strong anti-electromagnetic pulse immunity and good confidentiality. (5) It saves nonferrous metals. General communication cables consume a large amount of non-ferrous metals such as copper, lead or aluminum. The optical fiber itself is non-metal, and the development of optical fiber communication will save the country a lot of non-ferrous metals.
(6) Easy expansion. A standard fiber-optic line with a bandwidth of 2Mbps can easily be upgraded to 4M, 10M, 20M and up to 100Mbps without any equipment replacement.
Xiaobian conclusion: After reading the above introduction, I believe we have a more in-depth understanding of what optical fiber is , I hope to be helpful to everyone. For more information, please continue to pay attention to this site information platform.
Fiber optic cable
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