Some methods factory make the connector with a fiber stub which is spliced to the fiber for termination. However, either epoxy or anaerobic adhesives followed by polishing have been determined to be the best methods. Fiber optic connector manufacturers have been working for over 30 years to make terminating optical fiber easier, faster and cheaper, and they have done a really good job. It also fights against chemicals. This helps your fiber connections stay strong in hard places. You should learn how different materials. The method used to terminate a fiber optic component dictates the final quality, its performance, and its limitations in application.