การปรับปรุงคุณภาพการขัดหัวต่อเส้นใยแก้วนำแสงด้วยเครื่องขัด ที่ปรับแรงดันกดได้

Abstract

This thesis presents an approach to improve optical fiber connector polishing quality using a polishing machine with adjustable pressure. Optical connectors with high quality end-face polishes are crucial in future optical access network, where they must meet standard. Common polishing conditions may not always yield best results in any equipment setup due to high statistical variance in the polished connector characteristics. In this approach, we study the impact of changing the polishing conditions on the statistical variances of connector characteristics including the apex offset, radius of curvature and fiber height. The approach is enabled by our pneumatic system modification and improved controller design. By increasing the pressure by +8.3 and reducing the polishing time by -30 s in each stage, it is found that the standard deviation of optical connector characteristics including apex offset, radius of curvature and fiber height are reduced. In addition, average characteristics approach the optimal expected values and the yield of connectors with characteristics passing the criteria is maximum, increased by approximately 17% compared with other polishing conditions. The measured average Insertion and return losses are equal to 0.18 dB, 0.14 dB and -33.73 dB, -33.87 dB respectively, which agree with the reduction in the standard deviations of the characteristics. Our approach to improve the fiber connector polishing quality using polishing machine with adjustable pressure may be applied to the manufacturing. The technique can be applied to other types of polished connectors with different ferrule sizes.