Tech Note 20 Fiber Preparation and Fiber Connectors
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What type of fiber optic coupler is FC
An FC type fiber optic coupler is a device that connects or splits optical signals using FC (Ferrule Connector) connectors, providing secure, threaded connections ideal for high-vibration environments.
Overview of FC Connectors
The FC connector (Ferrule Connector) is a single-mode fiber optic connector with a threaded screw-lock mechanism, designed to provide a secure, vibration-resistant connection . It uses a 2.5 mm ceramic ferrule to align the fiber cores precisely, ensuring low insertion loss and minimal back-reflection. FC connectors are commonly available in three polish types:
- PC (Physical Contact): Standard convex polish for low back-reflection.
- UPC (Ultra Physical Contact): Enhanced polish for even lower back-reflection.
- APC (Angled Physical Contact): 8° angled polish to minimize reflected light, achieving return loss up to 60 dB . FC connectors are widely used in telecommunications, datacom, measurement equipment, and single-mode lasers, particularly in environments with high vibration or mechanical stress .
FC Fiber Optic Couplers
An FC fiber optic coupler is a passive device that allows splitting, combining, or adapting optical signals between fibers using FC connectors . Key features include:
- Connector Compatibility: Designed specifically for FC connectors; FC/APC couplers should only mate with other FC/APC connectors to maintain low back-reflection .
- Modes Supported: Available for single-mode and multimode fibers.
- Construction: Couplers can be made of plastic or metal, with ceramic alignment sleeves for single-mode fibers and bronze sleeves for multimode fibers .
- Configurations: Simplex (single fiber) or duplex (dual fiber) couplers, with rectangular, square, or circular mounts.
- Special Features: Some couplers include dustproof shutters, ruggedized construction, and military-grade specifications for harsh environments .
Applications
FC type couplers are ideal for:
- High-vibration industrial or transportation systems (railways, aircraft, ships)
- Telecom and datacom networks requiring precise alignment and low insertion loss
- Optical test equipment where secure, repeatable connections are critical
- Single-mode laser systems where back-reflection must be minimized
Maintenance Tips
- Always clean fiber end faces before mating to prevent permanent damage and increased coupling loss .
- Use dust caps when connectors are not in use.
- Avoid mating FC/APC connectors with non-angled types to maintain optimal return loss . FC type fiber optic couplers remain a reliable choice for applications demanding secure, low-loss, and vibration-resistant optical connections.
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