Optical fiber is the abbreviation of optical fiber, which is a light guide tool, which is realized by the principle of total reflection in the optical fiber made of glass or plastic. Typically, the transmitter device on one end of a single-mode gigabit fiber patch cord uses a light-emitting diode or laser beam to send light pulses to the fiber, while the receiver device on the other end of the fiber detects the pulse using a photosensitive element.
Carrier-grade single-mode dual-core fiber optic cable
What are the advantages of fiber optics?
1. Frequency bandwidth
The width of the frequency band represents the size of the transmission capacity. The higher the carrier frequency, the greater the bandwidth of the signal that can be transmitted.
2. Low loss
In a system consisting of coaxial cable, the optimal cable loses more than 40 dB per kilometer when transmitting a signal at 800 MHz. In contrast, the loss of optical fiber is much smaller, the loss per kilometer is less than 0.35 dB when transmitting 1310um light, and the loss per kilometer is even smaller if 1550um light is transmitted, up to 0.2 dB.
3. Light weight
Because the optical fiber is very thin, the diameter of the single-mode gigabit optical fiber jumper core is generally 4um~10um, and the outer diameter is only 125um, plus the waterproof layer, reinforcing ribs, sheath, etc., the diameter of the cable is from 4~48. The fiber is smaller than 13mm, much smaller than the standard coaxial cable diameter of 47mm, plus the optical fiber is glass fiber, the specific gravity is small, so it has a small diameter, light weight, and easy installation.
4. Strong anti-interference ability
Since the basic component of an optical fiber is quartz, it only transmits light, does not conduct electricity, and is not affected by electromagnetic fields. The transmitted optical signal is not affected by the electromagnetic field, so the optical fiber transmission has strong anti-electromagnetic interference ability. Therefore, the signals transmitted in the optical fiber are not easily eavesdropped, thereby facilitating confidentiality.
5. High fidelity
Since single-mode gigabit fiber jumper transmission usually does not require repeater amplification, no new nonlinear distortion will be introduced due to amplification. As long as the linearity of the laser is good, TV signals can be transmitted with high fidelity. The actual test shows that the carrier combination of a good AM fiber system is more than 70dB larger than C/CTB, and the intermodulation index cM is also higher than 60dB, which is much higher than the nonlinear distortion index of the general cable trunk system.
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