Advantages of fiber optic cable

Advantages and disadvantages of fiber optic cable

(1) long distance 

  Now single-mode fiber at a wavelength of 1310nm or 1550nm beam of low-loss window, attenuation per kilometer may be 0.2 ~ 0.4 dB, is the coaxial cable loss of 1% per kilometer. Therefore, optical multi-channel analog television transmission system can achieve 20 km transmission without interruption, this distance can basically meet the general needs of the city CATV trunk transmission.

(2) The transmission capacity   

Currently, the most advanced optical multi-channel television transmission system transmission frequency range extended from 40 ~ 550 MHz to 40 ~ 862 MHz, can be transmitted through an optical fiber path dozens of television signals, if the use of multi-core cable, the capacity to fold increase. In this way, with a few fiber quite a long time to fully meet the requirements for transmission capacity. At present, imports of Optical equipment, a core single-mode fiber can transmit television signals dozens of road, which is a medium-sized city CATV systems, optical fiber from the center of the total front end over to the sub-transmission lines can be 3-core optical fiber , of which two-core optical fiber for the transmission of television, FM radio and data signals; the other core can be used as an alternate one-way transmission or two-way transmission and multi-function expansion purposes. This is a coaxial cable, microwave multi-channel distribution of transmission can not be compared.

(3) transmission of high quality   

As the optical fiber coaxial cable as the transmission needs quite a lot like a relay amplifier, thus there is no noise and nonlinear distortion stackPlus. In addition, the optical frequency noise and nonlinear distortion optical fiber transmission system is small, the signal carrier to noise ratio, intermodulation, intermodulation and other performance indicators are higher. Coupled with strong anti-jamming performance fiber optic systems, largely unaffected by the outside temperature changes, thus ensuring the quality of the transmitted signal.

(4) Confidentiality of good performance

    Optical multi-channel television transmission system security is good, the transmission signal is not easy to steal, thus facilitating the management fees. Meanwhile, the optical fiber transmission is immune to electromagnetic interference, suitable for strong electromagnetic interference and electromagnetic radiation in the environment.

(5) to facilitate the laying of 

  Cable with a thin and light, turning radius is small, anti-corrosion, not afraid of tide, temperature coefficient, are not afraid of lightning, etc., so for the cable installation works is a big convenience.

(6) high performance and low costIn short, fiber optic cable for the trunk transmission system, its capacity, can be bi-directional transmission, the system of indicators, safe and high reliability. The main drawback is the high cost of network construction, the construction of technical difficulties, but it can adapt to long-distance trunk systems use large, is the largest city cable television development.