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Fiber Optic Connectors SC, LC, FC, ST (UPC, APC) for SM and MM Fibers
Fiber optic connectors are the foundation of reliable telecommunication solutions. They provide stable fiber-to-fiber connections, minimal signal loss, and long service life. In the Net-Server catalog, you will find all popular types — SC, LC, FC, ST available in UPC and APC versions, for both SM (Single-mode) and MM (Multi-mode) fibers.
🔹 Polishing Types: UPC vs. APC
- UPC — flat polish (0°), return loss ≈ –50 dB. Used for SM and MM fibers, data centers, and digital networks.
- APC — angled polish (8°), return loss ≈ –60 dB. Ideal for SM links, FTTH, WDM, GPON, and RF systems.
UPC connectors are usually blue, while APC are green.
🔹 Single-mode vs. Multi-mode
- SM (Single-mode) — core ≈ 9 μm, suitable for long distances, with low attenuation and high sensitivity to reflections.
- MM (Multi-mode) — core 50–62.5 μm, designed for short distances (LAN, data centers), typically used with UPC connectors.
🔹 Where Are APC Connectors Required?
- FTTH, GPON, WDM, DWDM optical networks;
- RF video and cable TV systems;
- Long SM lines where return loss is critical.
Important: APC and UPC are not compatible with each other. Connecting them will result in signal loss or equipment damage.
🔹 UPC vs. APC Comparison
| Type | Polish Angle | Return Loss | Applications |
|---|---|---|---|
| UPC | 0° | ≈ –50 dB | SM & MM, data centers, digital systems |
| APC | 8° | ≈ –60 dB | SM, FTTH, GPON, WDM, RF applications |
💡 Conclusions
- UPC — universal solution for MM and SM digital transmission.
- APC — best choice for critical SM lines and high-sensitivity applications.
- For MM use, UPC is usually sufficient.
📦 Buy Fiber Optic Connectors at Net-Server
We offer all types of SC, LC, FC, ST (UPC, APC) connectors for SM and MM fibers. Wide selection, guaranteed quality, and fast delivery across Ukraine.
Also check:
❓ FAQ – Frequently Asked Questions
- What is the difference between UPC and APC?
UPC has a flat polish (0°) and is used in digital systems, while APC has an angled polish (8°) with better return loss performance. - Can APC and UPC be connected together?
No, connecting them will cause signal loss and may damage equipment. - Which type is better for FTTH?
APC is recommended for FTTH due to its lower return loss. - Which connector is best for data centers?
UPC connectors are commonly used for data centers and short-distance links.