TAILIEUCHUNG - ADC KRONE - Guide - FO - The challenge in using APC connector

Tham khảo tài liệu 'adc krone - guide - fo - the challenge in using apc connector', công nghệ thông tin, quản trị mạng phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | The Challenges of Apex Offset in APC Connectors Fiber optic connectors provide a low loss means of connecting optical circuits. Low loss is achieved by minimizing the lateral offset between optical fibers and by maintaining physical contact between the optical fibers. Physical contact can be achieved when the ferrules containing the optical fibers have a convex spherical polish on the endface. By having the apex of the spherical polish coincide with the center of the ferrule containing the optical fiber, the fibers have a high probability of achieving physical contact when mated together. The parameters that define the endface geometry for a physical contact (PC) ferrule are radius of curvature, height of the fiber with respect to the polished radius, and the distance between the apex of the spherical polish and the center of the fiber (apex offset). The spherical polish of a ferrule can be applied at an angle to reduce reflectance of the connection. The most common angle is 8°. Meeting the criteria for fiber height and radius are no more difficult to do in an angled physical contact (APC) connector than a non-angled PC connector. However, achieving low apex offsets proves to be a challenge when the ferrule is polished at an angle. ∝ ∝ white paper Figure 1 Generally speaking, ferrules have a chamfer around the endface that is symmetric with the axis of the ferrule (See Figure 1). When polished at 8°, material is not removed uniformly about the axis of the ferrule (See Figure 2). Because the ferrule is tilted in polish, more material is removed from one side of the ferrule axis than the other. As Figure 2 shows, the angle on the left of the chamfer is not as steep relative to the angle on the right of the chamfer. As material is removed in polish, the surface of the endface becomes relatively larger on the left of the ferrule axis as shown in Figure 2 than the right. Hence the center of the ferrule endface moves to the left, away from the ferrule axis. When polished

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