GB/T 18311.26-2007 in English

《GB/T 18311.26-2007纤维光学互连器件和无源器件 基本试验和测量程序 第3-26部分：检查和测量 光纤和插针轴线间的角偏差的测量》由339-1（工业和信息化部（电子））归口，主管部门为工业和信息化部（电子）。
GB/T 18311本部分规定了测量装有单模光纤的连接器的圆柱体插针中光纤与插针轴线间的角偏差的程序。本程序规定了单模光纤连接器的圆柱体插针中光纤与插针轴线间的角偏差的测量方法。

Scope

This standard specifies the procedure for measuring the angular misalignment between the fiber and the axis of the ferrule in the cylindrical ferrule of a connector equipped with a single-mode optical fiber. ·Overview This part specifies the measurement method for the angular deviation between the optical fiber and the axis of the ferrule in the cylindrical ferrule of the single-mode fiber optic connector. Angular misalignment is defined as the angle δ between the axis of the ferrule and the axis of the installed fiber (see Figure l). The angular deviation is measured by rotating the pin around the axis and measuring the offset of the spot center of the pin in the far-field azimuth pattern. In a fiber optic connector, the characteristic value of its angular misalignment is generally in the range of a few tenths of degrees. The diameter of the light spot (white light source) at 5 mlTl from the pin surface is about 1 mm. When the connector is rotated, the offset value of the spot is about 1/100 of the spot diameter (the offset value of the spot corresponding to the angular deviation of 0.0 at 5 mm from the fiber surface is 45 μm). To be able to measure such a small offset with a high level of precision requires the use of automatic controls. In addition, the spot shift caused by the fiber is also affected by the slope of the fiber surface relative to the axis of the ferrule. The deflection values here conform to Snell's law. The degree of influence of the tilt can be calculated by the radius of curvature and the eccentricity of the reflection point. See Notes and Explanations on this subject. Appendix A.