With the rapid development of network communications, the application of optical fibers is also becoming more and more widespread. Optical fiber, this is a big and generic concept. Which is also subdivided into single-mode fiber and multi-mode fiber. What does this mean? What is the difference between the two? The following easy to fly communication to everyone to make a detailed introduction.
One: What is single-mode fiber?
Single mode fiber: The center glass core is very thin (the core diameter is usually 9 or 10 μm), and only one mode of fiber can be transmitted. Therefore, its inter-mode dispersion is small and suitable for remote communication.
Multi-mode fiber jumpers use multi-mode optical fibers, and connectors are installed at both ends to connect the devices to the fiber wiring links. Thicker protection layers are generally used between the optical transceiver and the terminal box. connection. The multimode fiber allows different modes of light transmission over one fiber. Because the core diameter of the multimode fiber is larger, a less expensive coupler and connector can be used. The core diameter of the multimode fiber is from 50 μm to 100 μm.
Two: What is the difference between single-mode fiber and multi-mode fiber before?
1:light source
Single-mode fiber uses solid-state laser as the light source; multi-mode fiber uses light-emitting diode as light source.
2: Broadband
Single-mode fiber has a wide transmission bandwidth and long transmission distance, but it requires a laser source because of its high cost. Multimode fiber has a low transmission speed and a short distance, but its cost is relatively low.
3: Diameter
Multimode fibers are typically 50 or 62.5 μm core diameters, whereas typical single-mode fibers are 8 and 10 μm core diameters, both with a cladding diameter of 125 μm.
4: dispersion
Single-mode fiber has a small core diameter and dispersion, allowing only one mode of transmission; multi-mode fiber core diameter and dispersion, allowing hundreds of modes of transmission.
Three: Where are the single-mode/multi-mode optical fibers and single-mode/multi-mode optical modules used?
Single-mode fiber enables the fiber to be directly transmitted to the center, and is generally used for long-distance data transmission; the optical signal in the multi-mode fiber propagates through multiple paths, so the multi-mode fiber is often used in short-distance data transmission.
Single-mode optical modules are commonly used in metropolitan networks where long-distance and relatively high transmission rates exist; multi-mode optical modules are used in short-distance transmission.
Four: Single-mode / multi-mode fiber and single-mode / multi-mode optical module can be mixed it?
Single-mode/multi-mode optical fibers can not be mixed with single-mode/multi-mode optical modules. Optical fibers and optical modules must be matched to work properly.
Five: What is the price for single-mode fiber jumpers and multi-mode fiber jumpers?
The price of single-mode fiber jumpers is relatively high, and the price of multi-mode fiber jumpers is relatively cheap, mainly because of the difference in the type of fiber they use and the difference in transmission distance.
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