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Fiber Optic Cable LC Connector Fabrication

Fiber and communications infrastructure knowledge brief Published 29 Aug 2024

Prepared for preliminary research by the ALFA PRO knowledge desk. Confirm optical interfaces, port or core capacity, electrical input and output, enclosure protection, thermal design and installation limits against current standards and product documentation.

LC connectors are small-form-factor fiber optic connectors that require precise assembly using specialized tools to ensure low insertion loss and reliable performance.Overview of LC Connectors

LC (Lucent Connector) is a 1.25 mm ferrule small-form-factor connector widely used in high-density applications such as data centers, telecom networks, and SFP/SFP+ transceivers . LC connectors are available in simplex, duplex, UPC, and APC configurations, with duplex LC connectors supporting bidirectional communication. The ferrule, typically ceramic, aligns the fiber core precisely to minimize insertion loss (55 dB, APC >65 dB), . The connector body provides mechanical integrity and a push-pull latch for secure connections.

Components Required
  • Ferrule: 1.25 mm ceramic or stainless steel, holds the fiber in precise alignment .
  • Connector body: Provides structural support and coupling mechanism.
  • Boot or strain relief: Protects the fiber from bending and mechanical stress.
  • Adhesive or epoxy: Secures the fiber inside the ferrule.
  • Polishing film or machine: Ensures a smooth fiber endface for optimal light transmission.
Tools and Equipment
  • Fiber strippers: For removing the outer jacket, buffer, and coating (e.g., Ripley Miller FO 103-S, Jonard JIC-375), .
  • Kevlar cutters: To trim strength members without damaging the fiber .
  • Cleaver: Produces a clean, perpendicular fiber endface.
  • Epoxy dispenser or UV curing system: For bonding the fiber inside the ferrule .
  • Polishing puck and films: For finishing the ferrule endface to UPC or APC specifications.
  • Microscope or inspection scope: To verify fiber alignment and endface quality.
Fabrication Process
  1. Cable Preparation: Strip the fiber optic cable to expose the bare fiber, remove the buffer coating, and trim Kevlar strength members .
  2. Cleaving: Use a precision cleaver to create a flat, perpendicular fiber end.
  3. Ferrule Insertion: Insert the cleaved fiber into the LC ferrule, ensuring proper alignment.
  4. Epoxy or UV Bonding: Apply adhesive to secure the fiber inside the ferrule and cure as required.
  5. Polishing: Polish the ferrule endface using the appropriate film or machine to achieve UPC or APC finish, ensuring minimal insertion loss and back reflection .
  6. Assembly: Attach the connector body, boot, and strain relief to complete the LC connector.
  7. Testing: Inspect the fiber endface under a microscope and test insertion loss and return loss to verify performance.
Best Practices
  • Work in a clean, dust-free environment to prevent contamination.
  • Use precision tools designed for 1.25 mm ferrules to avoid misalignment.
  • Follow manufacturer specifications for epoxy curing and polishing techniques.
  • Always inspect and test each connector before deployment to ensure network reliability . By following these steps and using the correct tools, LC connectors can be fabricated to provide high-performance, reliable connections suitable for modern high-speed fiber optic networks.

Fiber Optic Cable LC Connector Fabrication - ALFA PRO COMMUNICATION SYSTEMS (Pty) Ltd [PDF]

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This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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