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Introduction to the main geometric parameters of fiber optic jumper connectors

Time: 2019-04-25

⦁ Preface
        Fiber optic jumpers are important connectors in optical communication. In order to improve the stability, reliability, and communication quality of high-speed networks, the parameters of fiber optic connectors have strict requirements.
        The following is a brief introduction to the parameters of LC connectors based on international standard requirements.
⦁ Parameter requirements for optical fiber connectors:
1. Overall dimensions
        Figure 1 shows the outline and size diagram of a LC ceramic plug used for fiber optic jumpers:

Outline and Dimensional Drawing of Insert Core

Figure 1 Outline and Dimensional Drawing of Insert Core
 

        Some important external dimensions are defined in international standards:
        a. Ceramic insert outer diameter: Ø A, international standards define three levels:

Table 1 Classification of Ceramic Outer Diameter Classes

Grade
Minimum value Ø A
(unit: mm)
Maximum value Ø A
(unit: mm)
Remarks
1
1.2485
1.2495
\
2
1.2483
1.2495
\
3
1.2487
1.2495
\

        b. Step outer diameter: AE, international standard: 0.60-0.85mm;
        c. Chamfer angle: AG, international standard: 32.5-37.5 °;
2. The 3D interference indicators
        The 3D interference indicators of ceramic inserts refer to: surface radius, fiber height, and vertex offset:
        a. Curved radius refers to the radius of the top curved surface of the plug, specifically located on the left side of Figure 3. a) AF in the end face of the PC polished plug, international standard requirements: 7-25mm:
        b. The height of the optical fiber refers to the distance from the end face of the optical fiber to the end face of the insertion core. The specific position is BK in the extension diagram b) A on the right side of Figure 3, and the international standard requires a range of -50~+50nm.
        Among them,+represents that the fiber end face is higher than the plug end face, - represents that the fiber end face is lower than the plug end face, that is, the fiber end face is concave relative to the plug end face, as shown in the detailed schematic diagram in Figure 2:

Schematic diagram of fiber optic height

Figure 2 Schematic diagram of fiber optic height

        c. Vertex offset refers to the offset distance from the top of the insertion core to the fiber core, as shown in Figure 3:

Schematic diagram of vertex offset

Figure 3 Schematic diagram of vertex offset

        International standard requirements range: 0-50um;
        Moduletek Limited provides various types of fiber optic jumper products, welcome everyone to choose and purchase.
        If you have any questions about the above content, you can contact us by Email : web@moduletek.com

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