Light classification and propagation speed

Update:26 Dec 2017

For optical fiber and coaxial cable data transmission s […]

For optical fiber and coaxial cable data transmission speed, anti-interference ability, the price is not the same. In most domestic or civilian markets, coaxial cable usage and penetration is much higher than the optical fiber, which is the advantage of low-cost coaxial cable; data transmission, the general standard-definition images, for example, regardless of Is the data stability or data size, the latter can also meet user needs.
Optical fiber is mainly to solve two problems: First, the transmission distance, one is the environmental interference. Coaxial cable can only solve the problem of short-distance and small-scale monitoring image transmission. If you need to transmit image signals of several kilometers or even hundreds of kilometers, you need to use optical fiber transmission.
Simply put, the biggest difference between coaxial cables and optical cables lies in the transmission speed. Optical cables are much faster than coaxial cables. Of course, optical cables are the fastest medium for transmitting data.
Optical fiber
a. Single-mode fiber
1 . Transmission bandwidth, communication capacity, short distance up to several gigabit transmission rate
2 . Low line loss, transmission distance
3. Anti-interference ability
4. Strong resistance to chemical corrosion
5. Rich manufacturing resources
1 . For high-speed, long-distance connection
2 . high cost
3. Narrow core, need laser source
4. Very small dissipation, high efficiency
Up to a few km to dozens of km
b. multimode fiber
1 . For low-speed, short distance wiring
2 . low cost
3. Wide core wire, good condenser
4. Dissipation, inefficient
Generally about 2000m