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How to choose multimode fiber and single mode fiber
Time:
2019-10-30 13:33
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Many weak friends have repeatedly quoted us about the choice of fiber single-mode and multi-mode. Fiber is widely used in integrated wiring. Most people will encounter fiber single-mode and multi-mode selection. Let's get to know everyone today. Knowledge of this aspect.
The operating wavelength of the fiber is short wavelength 850 nm, long wave 1310 nm and 1550 nm. The fiber loss generally decreases with increasing wavelength. The loss at 850 nm is generally 2.5 dB/km, the loss at 1.31 μm is generally 0.35 dB/km, and the loss at 1.55 μm is generally 0.20 dB/km, which is the lowest loss of the fiber. The loss of the wavelength of 1.65 μm or more tends to increase. Due to the absorption of OHˉ (water peak), there are loss peaks in the range of 900~1300nm and 1340nm~1520nm, and these two ranges are not fully utilized.
Multi Mode Fiber - The core is thick (50 or 62.5μm) and can transmit multiple modes of light. However, the dispersion between the modes is large, which limits the frequency of transmitting digital signals, and is more serious as the distance increases. Therefore, the distance traveled by multimode fiber is relatively close, usually only a few kilometers. The following table shows the comparison of the bandwidth of multimode fiber optic cable:
From the above table, the comparison standard shows that CommScope's fiber optic cable far exceeds the standard defined in the standard.
At the same time, since G.652.D is the latest indicator of single-mode fiber, it is the most stringent and fully backward compatible of all G.652 levels. If you only indicate that G.652 means the performance specification of G.652.A, you should pay special attention to this. TeraSPEED fiber exceeds all specifications to meet the performance specifications of G.652.A, .B, .C and .D, as shown in the following table:
B. From the perspective of cost, the zero-water peak cable provides 50% more bandwidth than single-mode fiber, and the cost is similar. In fact, CommScope does not currently provide ordinary single-mode fiber, and only provides zero-water peak fiber. High performance products to users.
Based on the above analysis, we believe that users should combine the above factors from the perspective of application, transmission distance, forward-looking perspective, and cost, and invest in the best performance at the lowest price!
Use the reference table: