Leather fiber optic fusion splice box, fiber optic terminal box is the terminal joint of an optical cable, one end of which is an optical cable, and the other end is a pigtail, which is equivalent to a device that splits an optical cable into a single optical fiber, and is installed on the wall. The word "fiber fusion splicing" is unfamiliar to many people. The preparation of fiber end faces includes stripping, cleaning and cutting. A qualified fiber end face is a necessary condition for fusion splicing, and the quality of the end face affects the quality of fusion splicing. Therefore, this The whole process is called fiber splicing.
The main factors affecting fiber splicing:
There are many factors affecting the fiber splicing loss, which can be roughly divided into two types: intrinsic factors and extrinsic factors.
1. Intrinsic factors of optical fiber refer to the factors of optical fiber itself. There are four main points.
(1) The fiber mode field diameter is inconsistent;
(2) The core diameters of the two optical fibers are mismatched;
(3) The core section is not round;
(4) The concentricity between the core and the cladding is not good.
Among them, the inconsistency of the fiber mode field diameter has the greatest impact. According to the recommendation of CCITT (Consultative Committee for International Telegraph and Telephone), the tolerance standard of single-mode fiber is as follows:
Mode field diameter: (9~10μm) ±10%, that is, the tolerance is about ±1μm;
Cladding diameter: 125±3μm;
Mode field concentricity error ≤ 6%, cladding out-of-roundness ≤ 2%.
2. The extrinsic factor affecting the fiber splicing loss is the splicing technology.
(1) Axis misalignment: The core of a single-mode fiber is very thin, and the misalignment of the axes of two butt-connected optical fibers will affect the splice loss. When the misalignment is 1.2μm, the connection loss reaches 0.5dB.
(2) Axis tilt: When the fiber section is tilted by 1°, about 0.6dB splice loss occurs. If the splice loss is required to be ≤0.1dB, the inclination angle of the single-mode fiber should be ≤0.3°.
(3) End-face separation: The connection of the movable connector is not good, and the end-face separation is easy to occur, resulting in a large connection loss. When the discharge voltage of the fusion splicer is low, it is also easy to cause end face separation. This situation can generally be found in fusion splicers with tensile test functions.
(4) End face quality: When the flatness of the end face of the optical fiber is poor, loss or even air bubbles will occur.
(5)Physical deformation of the optical fiber near the splicing point: the tensile deformation of the optical cable during the erection process, too much pressure to clamp the optical cable in the splicing box, etc., will affect the splicing loss, and even several times of welding cannot improve it.
