Fiber Optic Connectors: Ensure they are clean and free of damage. Singlefiber. Thorlabs offers a family of products to assist customers who would like to terminate their bare fiber, including fiber polishing film for use with ceramic or stainless steel ferrules, polishing pucks, polishing plates, and termination kits. We also offer instructions on how to polish a connector. fiber optic connectors. The document is intended to inform and educate about polishing processes and commercial automated polishing equipment with various fixturing in order. Polishing fiber optic connectors is a critical process in ensuring optimal performance and signal quality in fiber optic communication systems.