What is the difference between fiber cold junction and fiber fusion?

Optical fiber transmission has the advantages of transmission frequency bandwidth, large communication capacity, low loss, no electromagnetic interference, small diameter of cable, light weight, rich source of raw materials, etc., and thus is becoming a new transmission medium. Light is lost when transmitted in an optical fiber. This loss is mainly caused by the transmission loss of the fiber itself and the splice loss at the fiber joint. Once the fiber optic cable is ordered, the transmission loss of the fiber itself is basically determined, and the splice loss at the fiber connector is related to the fiber itself and the on-site construction. Efforts to reduce the splice loss at the fiber optic connector can increase the fiber optic relay to amplify the transmission distance and increase the attenuation margin of the fiber link.

Cold junction of fiber

It is used for fiber optic docking fiber or fiber optic docking pigtail. This is equivalent to making a connector. (Fiber optic docking pigtail refers to the fiber core butt fiber core but not the former, and is used for this cold connection. Something is called a fiber optic cold junction. The fiber cold connector is used when two pigtails are docked. The main component inside is a precision v-groove. After the two pigtails are used, the cold connectors are used to realize the docking of the two pigtails. He is simpler and faster to operate, saving time than welding with a fusion splicer. Cold junctions generally come in two forms: a first-stage field fast linker; a second fiber-optic docking cold junction.

With the rapid development of FTTH fiber-to-the-home, the demand for fiber optic cold connectors has also increased significantly.

Fiber optic quick connector and fiber optic cold connector will play an irreplaceable role in FTTH access. Fiber optic quick connector field termination technology just solves this problem, no need for welding operation, fast and low cost, realizing anytime, anywhere access .

Cable fusion

Optical cable welding is a meticulous work, especially in the aspects of end face preparation, welding, fiber, etc., requiring the operator to carefully observe, carefully consider, and operate specifications.

Light is lost when transmitted in an optical fiber. This loss is mainly caused by the transmission loss of the fiber itself and the splice loss at the fiber joint. Once the fiber optic cable is ordered, the transmission loss of the fiber itself is basically determined, and the splice loss at the fiber connector is related to the fiber itself and the on-site construction. Efforts to reduce the splice loss at the fiber optic connector can increase the fiber optic relay to amplify the transmission distance and increase the attenuation margin of the fiber link.

The difference between cold junction and fusion

Hot Melt

It is necessary to use a fusion splicer and a fiber cutter to connect the two fibers without any other auxiliary materials. The advantage is that the quality is stable and the connection loss is small (about 0.03 to 0.05 db). The disadvantage is that the equipment cost is too high, the storage capacity of the equipment is limited, and the field operation is limited. In short, the welding quality is good, the attenuation is low, but the operation is troublesome, and the welding machine is needed.

Cold junction

No need for too much equipment, fiber cutters can be used, but each contact requires a quick connector (can be said to be the mainstream operation in the future), about 5 to 10 yuan, the advantage is easy to operate, suitable for field operations, the loss of defects Large, about 0.2 to 0.5dB per point. Cold joints. At present, there are fewer manufacturers in China that can be directly produced, and the cost is high. There is no room for choice in business and technical services, followed by cold joints. Matching solution, because of less use, short time, aging problems take time to test.

In short:

1, the cost of cold junction is much higher than hot melt, the price of a cold joint is about 15 yuan, and the head of the plane is about 5 yuan. The price of the hot melt tube is very low, just a few cents.

2, the cold-connected tool is more convenient to carry, and the hot melt needs to carry the hot melt machine. Very inconvenient.

3. The fiber loss after hot melt is low, and the cold-connected fiber connector is relatively large in loss.

Introduction of optical fiber fusion technology

1. What is a fiber cutting machine?

A: The fiber cutting machine, which is a device that cuts the fiber and other cables in a certain way, is mainly used to achieve standard smoothness and smooth cut, and prepare for the next fiber welding.

2. What is a fiber fusion splicer?

Answer: The optical fiber fusion splicer is to fuse the cut fiber at both ends according to the standard parameters, so that the light transmits signals normally in the line.

3. What is the main purpose?

A: These two devices are usually placed in a whole toolbox. They are mainly used in engineering where optical fiber transmission signals are used. Because the access and access of optical fibers must involve seamless connection of optical fibers.

4. What are the main people who need it?

A: There is a special training part to train fiber-optic welding personnel. This is mainly related to training, and has nothing to do with other academic qualifications. It is mainly used for information engineering personnel. One equipment is generally between 20000-100000.

5. Main factors affecting the splice loss of optical fiber

There are many factors affecting the splice loss of optical fiber, which can be roughly divided into two types: optical fiber intrinsic factor and extrinsic factor.

The intrinsic factor of fiber refers to the fiber itself, and there are four main points.

(1) The optical fiber mode field diameter is inconsistent;

(2) Two fiber core diameter mismatches;

(3) The core cross section is not round;

(4) The core and the cladding are not concentric.

The extrinsic factor that affects the fiber's splice loss is the splicing technique.

The influence of other factors. The level of operation of the continuation personnel, the operation steps, the level of the fiber process, the degree of electrode cleaning in the fusion splicer, the setting of the welding parameters, and the cleanliness of the working environment all affect the value of the splice loss.

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