Instead of attaching a connector directly to the field fiber, you splice the pigtail's bare end onto your incoming fiber. This technique leverages the precision of factory termination, which consistently yields superior performance with extremely low insertion loss, often below 0. The bare fiber end. In this detailed video, we'll walk you through the fiber optic pigtail splicing process — from preparation to final testing. Typically, these fibers come in various configurations, including single-mode and multi-mode versions, and can be terminated. Fiber optic pigtail offers an optimal way to joint optical fiber, which is used in 99% of single-mode applications.