Instead of building a connector from scratch in the field, you simply fuse the “bare” end of the pigtail to your incoming trunk fiber. The most efficient way to terminate a fiber run is by using a pigtail. A fiber pigtail is a short length of optical fiber that comes with a high-quality, factory-polished connector already installed on one end, leaving a length of exposed glass on the other. Get the wrong connector type, the wrong polish, or skip proper fusion splicing technique—and you're looking at elevated signal loss, increased back reflection, and a. Fiber optic pigtails solve this operational bottleneck by shifting the most critical optical interface-the connector-from the unpredictable field to a controlled factory environment. The connector end plugs into. We terminate fiber optic cable two ways - with connectors that can mate two fibers to create a temporary joint and/or connect the fiber to a piece of network gear or with splices which create a permanent joint between the two fibers. That is a fiber optic pigtail, and it is one of the most misunderstood parts of an optical network.