One fiber optic cable corresponds to one pigtail tube
A fiber pigtail is a thin multimode or single-mode fiber optic cable with a connector installed on one end. By combining factory-installed connectors with spliced bare fiber, pigtails ensure that network installers can create fast, reliable, and cost-effective terminations. They're related, but they are not interchangeable. This termination process is called splicing. Hence the connector side can be linked to equipment and the other side melted with optical fiber cables. [pdf]