Optical fiber cable reference points

The selection of optical fiber cable is not only based on the number of cores of the optical cable and the type of optical fiber, but also the outer sheath of the optical fiber cable according to the use of the optical fiber. Pay attention to the following points when selecting:

1. When the outdoor optical cable is directly buried, the armored optical cable should be selected. When it is overhead, the optical cable with black plastic outer sheath with two or more reinforcing ribs can be selected.

2. When selecting optical cables used in buildings, attention should be paid to their flame retardant, toxic and smoke characteristics. Generally, in pipes and forced ventilation, flame retardant and smoke types can be selected, and flame retardant should be selected in exposed environments. , smoke-free and non-toxic types.

For vertical wiring on the 3rd floor, layer-stranded optical cables can be selected; for horizontal wiring, branch optical cables can be selected.

4. Multi-mode optical cables can be used for transmission distances within 2km; relay or single-mode optical cables can be used for more than 2km.

The above are just a few issues that should be considered from the application point of view. The implementation needs to be flexibly grasped. In fact, the wiring environment is complex and diverse, and various problems may appear at any time. This requires us to strictly follow the wiring standards during planning and construction. , encountered problems, flexible analysis, will be satisfactorily resolved.

Single-mode fiber only transmits the main mode, that is to say, the light is only transmitted along the inner core of the fiber. Since mode scattering is completely avoided, the transmission frequency band of single-mode fiber is very wide, so it is suitable for large-capacity, long-distance fiber optic communication , the wavelength of light used by single-mode fiber is 1310nm or 1550nm.

Multimode fiber, under a certain working wavelength, there are multiple modes transmitted in the fiber, this kind of fiber is called multimode fiber, due to dispersion or aberration, so the transmission performance of this fiber is poor, the frequency band is relatively narrow, and the transmission capacity Smaller and shorter distance.