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High‑Precision FC UPC Multimode Fiber Optic Connector for Reliable Optical Links
FC interface with threaded metal coupling nut for secure, vibration‑resistant mating.
UPC‑polished 2.5 mm zirconia ferrule for low insertion loss and stable alignment.
Compatible with multimode fibers (50/125 μm and 62.5/125 μm).
Insertion loss: typical ≤0.15 dB, maximum ≤0.30 dB; return loss ≥35 dB.
Rated for over 1.000 mating cycles with minimal performance drift.
Operating temperature: ‑40°C to +85°C for indoor and controlled outdoor environments.
Meets international standards and RoHS compliance.
What is an FC UPC Multimode Fiber Optic Connector?
The FC UPC multimode fiber optic connector is a precision termination device that provides a low‑loss, mechanically robust connection for multimode fiber systems. It features a threaded metal coupling nut for secure locking, a high‑precision 2.5mm zirconia ceramic ferrule, and an UPC polished end‑face that reduces insertion loss and back reflection. This connector is widely used in local area networks (LANs), wide area networks (WANs), CATV, passive optical networks (PON), and FTTH applications where stable, vibration‑proof multimode connectivity is required.
FC UPC Multimode Fiber Optic Connector Specification parameters
- Specification parameters
- OPTICAL CHARACTERISTICS
| Item | UPC | APC | ||
|---|---|---|---|---|
| Φ0.125mm | Φ0.25mm | Φ0.125mm | Φ0.25mm | |
| Radius of Curve(mm) | 7~25 | 10~25 | 5~12 | 5~12 |
| Return Loss(dB) | 50 | 50 | 55 | 55 |
| Apex Offset(um) | ≤50 | |||
| Fiber Height(nm) | -0.5 | |||
| Polishing Angle(°) | 8±0.3 | |||
| Testing Wavelength(nm) | 1310 & 1550 | |||
| Insertion Loss | ≤0.3dB | |||
| Operating Temperature | -40℃ ~ +80℃ | |||
| Cable Diameter | 0.9mm, 2mm, 3mm | |||
| Service Life | N > 1000 | |||
| Dust Cap | LDPE | |||
| Connectors Type | FC, ST, SC, LC | |||
| Polishing Type | UPC, APC | |||
| Fiber Type | Single-mode, Multi-mode | |||
| Port Type | Simple, Double | |||
| Application | Drop Cable / Patch Cords / Pigtail | |||
Product Structure & Composition
Threaded Metal Coupling Nut
Threaded coupling nut (M5×0.75) screws onto adapter barrel, providing positive mechanical lock against vibration and accidental disconnection.
2.5mm Zirconia Ceramic Ferrule
2.5mm zirconia ceramic ferrule aligns fiber with micron accuracy, ensuring low insertion loss and high return loss for consistent transmission.
UPC Polished End‑Face
UPC polished end‑face with slightly convex surface reduces air gaps, lowering insertion loss and improving return loss over PC finishes.
Boot and Cable Compatibility
Black boot (multimode) supports 900μm, 2.0mm, and 3.0mm cables, providing strain relief and protecting the ferrule junction.
Benefits of FC UPC Multimode Fiber Optic Connector
Vibration‑Proof Threaded Locking
Threaded metal coupling nut provides superior mechanical lock over push‑pull/bayonet, ensuring secure mating in high‑vibration environments (industrial, railway, field tests), eliminating intermittent failures.
Low Insertion Loss and High Return Loss
UPC ferrule and precision alignment deliver ≤0.15dB insertion loss and ≥35dB return loss, minimizing attenuation/reflections for high‑speed multimode links (10G Ethernet over OM3/OM4).
Exceptional Durability and Long Service Life
Rugged metal housing and wear‑resistant zirconia ferrule withstand >1,000 mating cycles with <0.1dB loss change, reducing maintenance costs and ensuring consistent long‑term performance.
Versatile Cable Compatibility and Easy Identification
Supports 900μm, 2.0mm, and 3.0mm cables for multimode; black boot enables visual identification, simplifying inventory/installation. Complies with international standards for FC adapter interoperability.
Engineering Applications FC UPC Multimode Fiber Optic Connector
Shipping & Packaging
Product Comparison：
FC UPC Multimode Connector vs. SC UPC Multimode Connector
| Feature / Dimension | FC UPC Multimode Connector | SC UPC Multimode Connector |
|---|---|---|
| Structure / Form Factor | Round metal housing with threaded coupling nut. 2.5mm zirconia ferrule. Black boot. | Rectangular plastic housing with push‑pull latch. 2.5mm zirconia ferrule. |
| Coupling Mechanism | Threaded (M5×0.75) - requires screwing/unscrewing. Excellent vibration resistance. | Push‑pull - insert until click, pull to release. Fast and tool‑less. |
| Typical Applications | High‑vibration environments, test labs, CATV, industrial, central offices. | Data centers, enterprise networks, FTTH, high‑density patching. |
| Key Engineering Pros | - Superior mechanical locking for vibration‑prone installations. - Metal housing offers higher durability. - Preferred for repeatable test connections. | - Quick connect/disconnect saves time. - Lower cost and lighter weight. - Higher port density due to smaller footprint. |
| Key Engineering Cons | - Slower to connect/disconnect. - Heavier and more expensive than SC. | - Push‑pull latch less secure under vibration. - Plastic housing less robust for harsh environments. |
| Tolerance to Vibration / Shock | Excellent - threaded nut prevents loosening. | Good, but may loosen under sustained vibration. |
| Insertion Loss (Typical) | ≤0.15dB | ≤0.20dB |
| Return Loss | ≥35dB | ≥35dB |
| Mating Cycles | >1,000 | >1,000 |
| Relative Cost | Moderate to high (metal construction) | Economical (plastic construction) |
FC UPC Multimode Fiber Optic Connector Selection Guide
How to Choose the Right FC UPC Multimode Connector
Selecting the correct FC UPC multimode connector begins with identifying your fiber type. This connector is designed for multimode fibers – choose the version that matches your cable: OM1 (62.5/125μm), OM2 (50/125μm), OM3, or OM4. Using a single‑mode connector on multimode fiber will cause excessive loss.
Next, determine the cable diameter. The connector is available with boots for 900μm tight‑buffer, 2.0mm, and 3.0mm round cables. Measure your cable’s outer diameter and select the corresponding boot to ensure proper strain relief and fit.
Consider your installation environment. If the connector will be used in a high‑vibration setting (e.g., industrial machinery, outdoor cabinets, or railway equipment), the FC’s threaded locking mechanism offers a clear advantage over push‑pull designs. For standard indoor patching, the FC is still a reliable choice but may be slower to install than SC or LC.
Finally, verify polarity if you are using duplex or array applications – ensure your adapter and mating connectors are keyed consistently. The FC connector’s alignment key prevents rotation but does not dictate polarity; that is managed at the cable level.
Installation Instructions
Connector Termination (Epoxy‑Polish Method)
Strip cable and buffer; insert fiber into ferrule with epoxy and cure. Cleave fiber flush with ferrule end‑face, then polish to UPC finish. Inspect end‑face under microscope to confirm no scratches or debris.
Mating to an Adapter
Inspect connector and adapter sleeve for dust. Align key with slot, insert fully, then screw nut snug (do not over‑tighten). To disconnect, unscrew and withdraw.
Cable Management and Labelling
Secure cable with strain‑relief ties, keeping bend radius ≥10× cable diameter. Label both ends with circuit ID and fiber type. The black boot and metal housing accept marker or adhesive labels for clear identification.
Download YRTFIBER Product Catalog
Factory Real Shot
Frequently Asked Questions & Quick Inquiry
FC UPC Multimode Fiber Optic Connector FAQ
How fast will I get a reply to my inquiry?
We respond within 24 hours to all inquiries, ensuring fast and professional communication.
What is the typical insertion loss for this connector?
The typical insertion loss is ≤0.15dB, with premium versions achieving ≤0.10dB. The maximum insertion loss is 0.30dB.
Can I use this multimode connector on single‑mode fiber?
No. The ferrule core diameter and polish specifications differ. Using a multimode connector on single‑mode fiber will cause high loss and is not recommended.
How does the threaded coupling work?
Insert the connector into the adapter, then screw the metal nut clockwise until finger‑tight. Do not use tools, as over‑tightening can damage the ferrule.
How many mating cycles does it support?
The connector is rated for over 1,000 mating cycles with minimal change in insertion loss (typically <0.1dB).
How do I clean the connector end‑face?
Use a dry cleaning cassette or lint‑free swab wetted with isopropyl alcohol. Gently wipe the ferrule end‑face in a circular motion from centre to edge, then dry with a clean swab. Regular cleaning maintains low insertion loss.
What is the difference between UPC and APC for multimode?
UPC has a slightly convex polished surface with a flat finish; APC (Angled Physical Contact) has an 8‑degree angle. For multimode, UPC is standard because APC is rarely used due to higher cost and limited benefit on multimode links.
Can I field‑terminate this connector?
Yes, FC connectors are available in field‑installable versions (epoxy‑crimp or pre‑polished mechanical splice). However, factory‑terminated assemblies are recommended for best performance.
What colour boot should I use for multimode?
Industry standard is black for multimode connectors (beige or aqua for connectors with colour‑coded bodies, but boots are often black). Use black to indicate multimode.
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