Article Overview
Optical cable fittings can be categorized by fiber type, connector design, polish style, and fiber count, covering single-mode, multimode, and multi-fiber applications.
1. By Fiber Type
- Single-Mode Connectors: Designed for long-distance, high-bandwidth applications with a core diameter of 8–10 µm. Common connectors include LC, SC, FC, and MU, often with PC, UPC, or APC polish .
- Multimode Connectors: Used for shorter distances, typically in buildings, with core diameters of 50 or 62.5 µm. Popular types are ST, MTRJ, LC, and SC, usually with PC or UPC polish .
2. By Connector Design
- LC (Lucent Connector): Small form factor (1.25 mm ferrule), ideal for high-density panels, duplex or uniboot versions, supports both single-mode and multimode fibers .
- SC (Subscriber Connector): Square shape, push-pull coupling, widely used in FTTH and data centers, available in SC/UPC and SC/APC .
- ST (Straight Tip): Bayonet-style lock, common in legacy LANs and campus networks, mainly multimode .
- FC (Ferrule Connector): Threaded coupling, suitable for high-vibration environments, often single-mode with APC polish .
- MTRJ (Mechanical Transfer Registered Jack): Duplex multimode connector, compact design for building networks .
- MPO/MTP (Multi-Fiber Push-On): Multi-fiber connectors (12, 24, 36 fibers), used in high-density, high-bandwidth environments, including 400G/800G applications .
- VSFF (Very Small Form Factor): Includes CS connectors, QSFP-DD, OSFP transceiver interfaces, optimized for extreme port density .
3. By Polish Type
- PC (Physical Contact): Standard polish for general applications, reduces back reflection .
- UPC (Ultra Physical Contact): Low insertion loss, used in digital, CATV, and telephony systems .
- APC (Angled Physical Contact): Angled ferrule for minimal back reflection, preferred in CATV and analog systems .
4. By Fiber Count
- Simplex: Single fiber terminated in the connector. Examples: FC, ST, SC, LC, MU, SMA .
- Duplex: Two fibers terminated in one connector housing. Examples: SC, LC, MU, MTRJ .
- Multi-Fiber: More than two fibers (up to 24 or more) terminated in a single connector, typically MPO/MTP .
5. By Application
- High-Density Data Centers: LC duplex, MPO/MTP, VSFF connectors for compact, high-bandwidth setups .
- Telecom and FTTH: SC/APC, LC, ST connectors for reliable subscriber connections .
- Industrial or High-Vibration Environments: FC connectors with APC polish for secure, low-reflection connections .
- Legacy Networks: ST and SC connectors for campus LANs and older installations . This categorized list provides a structured overview of optical cable fittings, helping in selecting the right connector type based on fiber type, density, polish, and application requirements.
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