选择光纤时除了考虑光纤芯数和种类，还要考虑使用环境：
1.户外光纤：直埋时易用松套铠装光缆;架空可选用带两根或以上加强筋的黑色PE外护套的松套光缆。
2.室内光纤：选用紧套光缆，并注意光缆的阻燃、毒和烟的特性。
3.楼内垂直或水平布缆：选用与室内通用的紧套光纤、配线光纤或分支光纤。
4.室内和短距离以多模光纤为主;室外和长距离以单模光纤为主。
使用光纤有哪些优点?
1) 光纤的通频带很宽，理论可达30T。
2) 无中继支持长度可达几十到上百公里，铜线只有几百米。
3) 不受电磁场和电磁辐射的影响。
4) 重量轻，体积小。
5) 光纤通讯不带电，使用安全可用于易燃，易暴等场所。
6) 使用环境温度范围宽。
7) 使用寿命长。
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How to choose fiber? What are the advantages of using optical fiber?
In addition to considering the number and type of fiber cores, the use environment should be considered when selecting optical fibers:
- Outdoor optical fiber: easy to use loose tube armored fiber optic cable for direct burial; loose tube fiber optic cable with black PE outer sheath with two or more reinforcing ribs can be used for overhead.
- Indoor optical fiber: use tight-buffered optical cable, and pay attention to its flame retardant, poisonous and smoke characteristics.
- Vertical or horizontal cabling in the building: use tight-buffered optical fibers, distribution optical fibers or branch optical fibers that are commonly used indoors.
- Indoors and short distances are mainly multi-mode fibers; outdoor and long distances are mainly single-mode fibers.
What are the advantages of using optical fiber?
1) The pass band of optical fiber is very wide, theoretically up to 30T.
2) The length of non-relay support can reach dozens to hundreds of kilometers, and the copper wire is only a few hundred meters.
3) Not affected by electromagnetic field and electromagnetic radiation.
4) Light weight and small size.
5) Optical fiber communication is not live, safe to use and can be used in flammable, explosive and other places.
6) Wide operating environment temperature range.
7) Long service life.
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