In-line polarization controller for hollow core photonic bandgap fiber

We demonstrate an in-line polarization controller for hollow core photonic bandgap fiber made by inserting a length of the fiber into a standard, off-the-shelf, 3-paddle controller as widely used for polarization control using standard single mode fibers. Although the operational principle of this 3-paddle controller is very different when using hollow core photonic bandgap fiber rather than SMF effective polarization control is readily achieved.