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Comparison of single-mode fiber and multi-mode fiber.


In today's network construction, optical fiber has been widely used due to its high speed and fast speed. Among them, single-mode fiber and multi-mode fiber are the most common. 

1.Comparison of basic structure of single-mode fiber and multi-mode fiber
The basic structure of optical fiber is generally composed of outer sheath, cladding, core, and light source. Single-mode fiber and multi-mode fiber have the following differences:

2.Color difference of outer sheath
In practical applications, the color of the outer sheath of the fiber can be used to quickly distinguish single-mode fiber from multi-mode fiber. According to the TIA-598C standard definition, single-mode fibers OS1 and OS2 use yellow outer sheaths, multimode fibers OM1 and OM2 use orange outer sheaths, and OM3 and OM4 use aqua blue outer sheaths (for non-military use).

3.Core diameter difference
There is a significant difference in core diameter between multi-mode fiber and single-mode fiber. The core diameter of multi-mode fiber is usually 50 or 62.5 µm, and the core diameter of single-mode fiber is 9 µm. In view of this difference, a single-mode fiber can only transmit optical signals with a wavelength of 1310nm or 1550nm on a narrow core diameter, but the advantage of the small core is that the optical signal propagates in a straight line in the single-mode fiber. Refraction occurs, the dispersion is small, and the bandwidth is high; the multimode fiber has a wide core, which can transmit multiple modes at a given operating wavelength, but at the same time, because the multimode fiber transmits hundreds of modes, each mode The propagation constant of the fiber is different from the group rate, so that the bandwidth of the fiber is narrow, the dispersion is large, and the loss is large.

4.Difference in light source
The light source usually has two kinds of laser light source and LED light source. Single-mode fiber uses laser light source, and multi-mode fiber uses LED light source.

5.Comparison of transmission distance between single-mode fiber and multi-mode fiber
As we all know, single-mode fiber is suitable for long-distance transmission, and multi-mode fiber is suitable for short-distance transmission. The following table shows the specific transmission distances of different types of single-multimode fibers.

The cost difference between a multi-mode fiber system and a single-mode fiber system is similar, and the construction cost of a multi-mode fiber system is lower than that of a single-mode fiber system. Take the FS solution as an example. The cost of a multi-mode transmission system (multi-mode optical modules and jumpers) ranges from 3,300 yuan to 5,300 yuan, while a single-mode transmission system (single-mode optical modules and jumpers) The cost is usually more than 6,700 yuan, and the price difference is more than 1,000 yuan.

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