Optical transmission and cable transmission contrast
V signal optical transmission compared with coaxial cable transmission advantage:
1 because copper prices rose rapidly, cheaper cable demand increase, decrease production cost, so the cable is much cheaper than cable price.
2 transmission band width 1310 working wavelength bandwidth can reach 1 GMH, optical fiber can transmit 150 channels.
3 attenuation 1310 single mode fiber low loss of 0.36 dB/Km, 1550 of 0.22 dB/Km, 1% of the national standard coaxial cable attenuation constant is lower.
4 a few tens of kilometers high image quality using fiber optic cable transmission, can replace the multistage amplifier in cable transmission and multistage power supply devices, greatly improve the system stability, and optical transmission can realize multistage amplifier, signal to noise ratio, load ratio is a very small loss.
6 no electromagnetic interference due to optical fiber is non-metallic insulation, there is no electromagnetic induction and lightning and the threat of electric shock.
7 no obsessed with the electromagnetic leakage cable transmission is difficult to pick up the signal, will not produce interference between fiber, has excellent secrecy.
8 high temperature long life of high temperature resistance fiber, radiation resistance, corrosion resistance, long service life, the life of the cable can be up to 20 years, is the cable service life of 4 to 5 times.
9 small size light weight material is qualitative light, fiber optic cable for transportation and installation, etc.
Cable installation, debugging is simple, just on both ends of cable and optical transmitter and optical receiver, optical transmission without in the middle of the cable equipment, convenient installation and debugging, and image loss minimum, not cable transmission multistage amplifier signal-to-noise ratio decreased, the phenomenon such as harmonic intermodulation interference.
Use cable transmission need to add 6-7 in 2 km cable trunk amplifier, the amplifier need power supply, must be used for electrical appliances or 220 v power supply, installation and debugging, joint device, and the signal after the multistage amplifier signal-to-noise ratio drops, it's easy to have a hand in harmonic intermodulation interference, image quality loss serious shortcomings.
In this paper, by shandong Wan Shuo photoelectric equipment co., LTD.