250 μ m loose sleeve fiber optic cable and 900 μ m tight sleeve fiber optic cable are two different types of fiber optic cables, which have the same diameter core, cladding and coating. However, there are still differences between the two, specifically reflected in the structure, function, advantages, disadvantages and so on, which also makes the two have differences in application. This article will illustrate these two different types of fiber optic cables for you.
Comparison between 250 μ m loose sleeve fiber optic cable and 900 μ m tight sleeve fiber optic cable
For the loose sleeve structure of the fiber, it places the fiber helically in the semi-rigid tube, so that the cable can be extended without stretching the fiber itself. As shown in the figure below, the 250 μ m loose sleeve fiber is composed of core, 125 μ m cladding and 250 μ m coating. Generally speaking, the number of fiber cores in 250 μ m loose sleeve optical cable ranges from 6 to 144. Except for 6-core loose sleeve optical cable, other optical cables are usually composed of 12 core basic units.
Different from the above loose sleeve structure, the 900 μ m tight sleeve fiber has a hard plastic sleeve layer in addition to the 250 μ m loose sleeve fiber structure, which can play a protective role. As shown in the figure above, the 900 μ m tight sleeve fiber is composed of fiber core, 125 μ m cladding, 250 μ m coating layer (the coating layer is soft plastic) and sheath layer (the coating layer is hard plastic). Among them, the coating layer and sheath layer will help to isolate moisture from entering the core, and prevent the core from being exposed due to bending or compression when the optical cable is laid underwater. The number of cores in 900 μ m tight sleeve optical cable is usually between 2 and 144, and the tight sleeve optical cable with larger number of cores is basically composed of 6 or 12 cores.
The specifications of 250 μ m loose tube optical fiber and 900 μ m tight tube optical fiber are shown in the table below.
250μ m loose tube optical fiber | 900 μ m tight tube optical fiber | |
Fiber core | 9μm，single mode；50μm或62.5μm，multimode； | 9μm，single mode；50μm或62.5μm，multimode； |
Cladding | 125μm | 125μm |
Coating | Soft plastic；250μm | Soft plastic；250μm |
Mantle | --- | Hard plastic，900μm |
How to choose 250 μ m loose sleeve optical cable and 900 μ m tight sleeve optical cable?
Due to the different functional characteristics of 250 μ m loose sleeve fiber optic cable and 900 μ m tight sleeve fiber optic cable, their use conditions are also different. The details are as follows.
250μ m loose tube optical fiber | 900 μ m tight tube optical fiber |
High-density; Low shrinkage and high tensile strength; Mechanical force; Moisture-proof; UV protection; High temperature resistance; Flame retardant LSZH polymer; Enhance system performance. |
High flexibility; High tensile strength; Good mechanical and temperature performance; Water blocking; UV protection; Higher survival standard; Glass fiber reinforced components; Easy termination. |
The 250 μ m loose sleeve optical cable is suitable for harsh environment and is widely used outdoors. Compared with 900 μ m tight sleeve fiber optic cable, 250 μ m loose sleeve fiber optic cable has higher tensile strength, moisture resistance and high temperature resistance, which is suitable for temperature change and high humidity environment. However, if excessive stretching is applied, the core will be pulled out of the gel. In addition, 250 μ m loose sleeve fiber optic cable may not be a good choice when routing around multiple bends. The following will focus on why 250 μ m loose sleeve optical cable is suitable for outdoor environment.
1.Waterproofing -- by filling the inner structure of the cable with gel, the fiber cable is protected to the greatest extent and effectively prevents water penetration.
2.UV protection -- the outer sheath contains carbon black, which can effectively prevent UV.
3.Mechanical resistance - this kind of optical cable has an armored layer, which can withstand large mechanical force and improve durability.
4.Pipeline space -- it can be seen from the above that the structure of 250 μ m loose sleeve optical cable is different from that of 900 μ m tight sleeve optical cable, and the size of 250 μ m loose sleeve optical cable is almost one third of that of 900 μ m tight sleeve optical cable. Therefore, compared with 900 μ m tight sleeve optical cable, 250 μ m loose sleeve optical cable takes up less pipeline space, especially when there are more optical fibers, which can effectively reduce the total installation cost.
900 μ m tight sleeve optical cable is very suitable for indoor application. Compared with 250 μ m loose sleeve fiber optic cable, 900 μ m tight sleeve fiber optic cable has more robust characteristics, and is more suitable for medium distance LAN / WAN connection or long distance indoor laying, or even direct underground laying. The following will focus on why 900 μ m tight sleeve optical cable is used in indoor environment.
1.No gel is needed -- indoor use does not require the use of protective gel, so it is more suitable for installation of risers perpendicular to buildings.
2.Flexibility -- there are no stiffeners to make the cable more flexible. In addition, it can be pulled around multiple bends or suspended vertically without worrying about the movement of the fiber mandrel.
3.Easy splicing -- compared with 250 μ m loose sleeve cable, 900 μ m tight sleeve cable is less fragile, and its processing of each core is easier. There is no need to clean up the messy gel, and there is no fan out kit for splicing or termination.
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