Fiber Optic Splice Sleeve

- Oct 05, 2020-

The optical fiber is spliced through the optical fiber fusion splicer, and then the optical fiber splicing sleeve is needed. The protection of optical fiber splice points is very important. It's like putting on casts and bandages after surgery that hurts the bones. The following introduces the relevant knowledge of optical fiber splicing sleeve.

Optical Fiber Splicing Sleeve: Literal translation is optical fiber splicing sleeve. The formal definition is: a splicing component used to enhance protection or support positioning of optical fiber splices. Looking at the definition of experts, those "plaster bandages" have become "tall".

Chinese name: optical fiber splice sleeve

Foreign name: Optical Fiber Splicing Sleeve

Alias: Fiber splicing sleeve

Applied Subject: Information and Communication

Features: connection part, enhanced protection, support positioning, reliability

Heat shrinkable protection tube
When splicing the optical fiber through the optical fiber fusion splicer, we will strip off the outer coating and protective layer of the optical fiber. This operation will make the fusion splicing point susceptible to external influences, and the mechanical strength will be reduced accordingly. Therefore, it is necessary to strengthen the protection of the connection part. In the maintenance and construction of optical cables, we most commonly use heat shrinkable protective sleeves. As shown in Figure 1.

Heat shrinkable protection tube

The heat-shrinkable protective sleeve is a polyethylene heat-shrinkable tube, the inner wall of which is coated with hot melt glue, and a small steel pipe with a diameter of about 1.5 mm is placed in the middle. After heating, the polyethylene sleeve shrinks to wrap the optical fiber connector and the small steel pipe together.

This operation not only increases the strength of the optical fiber connector, but also avoids the influence of the bending deformation of the optical fiber connector when the polyethylene sleeve shrinks. It can also make the joint have better moisture resistance. Attention should be paid when heating: ensure that all the air in the tube is exhausted and heated evenly to avoid the formation of bubbles during heat shrinkage. At the same time, the heating temperature should be controlled reasonably to avoid scorching the polyethylene pipe.

V-groove elastic connection casing
For the mechanically connected optical fiber, in order to ensure that the optical fiber connector does not shift and to ensure a certain mechanical strength of the optical fiber connector, engineers and technicians have also designed various types of optical fiber connection sleeves. Some sleeves are suitable for crimping, and some sleeves are suitable for bonding.

The V-shaped groove elastically connects the sleeve. The two ends of the V-shaped groove in the sleeve have a certain taper, and the groove wall has a certain degree of elasticity. The diameter of the inscribed circle of the V-shaped groove is slightly smaller than the diameter of the connected fiber, and its material has The flexibility ensures that the inscribed circle of the V-groove can accommodate the optical fiber. When the optical fibers at both ends are embedded, the groove wall will be elastically deformed, and the optical fiber will evenly bear the elastic force of the groove wall radially, just like holding the optical fiber tightly with both hands, ensuring the alignment of the optical fiber connector.

Bonding splice casing
It is a transparent quartz glass tube with an adhesive in the tube. The adhesive tube is usually stored in a black box and protected from light. When optical fiber connection is required, open the black box and take out the connection sleeve. For single-mode optical fiber, firstly complete the production and cleaning of the end face of the optical fiber connector; then directly insert the bonding tube, place the bonding sleeve on the mechanical splicing device, input the corresponding signal, realize the alignment and bonding of the optical fiber, and The adhesive sleeve is cured under sunlight.
Technical selection
Technicians have designed different splicing sleeves according to different use environments, such as splicing sleeves for a single optical fiber and splicing sleeves for multiple optical fibers. Different types of bushings must be tested before they are used. Such as high temperature and low temperature cycle test, high temperature and low temperature immersion test, high temperature damp heat test and so on.

After a certain selection test cycle, observe the changes in the transmission characteristics of the optical fiber connector and whether the additional loss of the optical fiber connector meets the index requirements. At the same time, certain mechanical performance tests such as tensile strength and vibration tests are also required. Through the selection test to ensure that the optical fiber connection meets the corresponding technical standards.

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