Sectional type screening system and method for polarization properties of long polarization maintaining optical fiber

Abstract

The invention discloses a sectional type screening method for polarization properties of a long polarization maintaining optical fiber. The method comprises the steps that polarization coupling distribution of the optical fiber with a specific length at the outermost end of an optical fiber drum is obtained through optical path scanning of one interference arm of a nonequilibrium interferometer, and whether the polarization maintaining optical fiber at the outermost end meets the usage requirement is judged according to a polarization coupling amplitude value; the optical fiber section meeting the requirement is distributed step by step according to the usage requirement, and the optical fiber section which does not meet the usage requirement is removed. According to the sectional type screening method, the optical fiber drum is directly connected into a testing system, so that the testing system conducts sectional type screening on the polarization properties of the polarization maintaining optical fiber, the limitation of the instrument measuring range to optical fiber screening is eliminated, the complexity of a testing instrument is lowered, and the screening convenience is improved. When a defect point exists in the optical fiber, it is only required that the part, from the defect point to the outer endpoint of the optical fiber drum, of optical fiber is removed. Compared with the traditional method that the optical fiber is detected after being distributed, the method has the advantages that waste of the optical fiber is reduced, and the production cost is lowered.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and more specifically relates to a segmented screening system and method for polarization characteristics of long polarization-maintaining optical fibers, so as to meet the requirements of optical fiber gyroscope optical fiber surround system. Background technique [0002] Polarization-maintaining optical fiber has been widely used in the field of optical fiber sensing because of its linear polarization-maintaining ability. Among them, the fiber ring of fiber optic gyroscope is a typical application of polarization maintaining fiber. The polarization-maintaining ability of the optical fiber selected for the optical fiber surround system has become an important factor in determining the performance of the optical fiber ring and the optical fiber gyroscope. The polarization-maintaining ability of polarization-maintaining fiber is usually tested with an extinction ratio tester, and ev...

AI Technical Summary

Problems solved by technology

However, the measurement range of this equipment is limited. At present, the highest measurement range at home and abroad is about 2.6km. It is impossible to screen the optical fibers of several kilometers or even tens of kilometers wound on the optical fiber reel. After splitting the fibers, they are connected to the white light interferometer one by one for testing

In this case, if there is a defective area in the optical fiber, the entire section of optical fiber can only be scrapped, which greatly increases the winding cost of the optical fiber ring

Images