Optical fiber adapters play a pivotal role in the art of connecting fibers, whether of the same or different types, ensuring that the flow of data is as smooth and lossless as possible. These adapters are precision instruments, designed to align the fibers so that the light energy from the transmitting fiber is efficiently coupled to the receiving fiber, maximizing the transfer and minimizing the impact on the overall system.
Commonly referred to as fiber couplers or flanges, adapters come in various types, including AC, FC, SC, ST, LC, MU, MPO, and more. Among these, FC, SC, ST, and LC are the most prevalent in today’s market, with SC and LC adapters being particularly versatile for duplex configurations, and LC offering a wider range of duplex options.
This guide will illuminate the ways to identify different adapters and how to swiftly select the right product by recognizing their distinctive colors.
(1) Connector Types
The nomenclature AP/UPC, LC/UPC, LC/APC, FC/UPC, FC/APC, ST/UPC represents the combination of connector types and their respective end face geometries, which are crucial for optimal performance.
- SC: Standard square connectors made of plastic, known for their high-temperature resistance and resistance to oxidation.
- LC: Compact square connectors, smaller than SC by half, also made of plastic with similar high-temperature and oxidation-resistant properties.
- FC: Classic round connectors with a metal construction, valued for their repeatability and durability.
- ST: Features a key lock structure, also made of metal, ensuring repeatability and durability.
- UPC: Stands for Ultra Physical Contact, indicating a flat end face profile.
- APC: Refers to Angled Physical Contact, characterized by an 8-degree angled polish.
The “/” symbol denotes the type of fiber adapter being discussed, while what follows indicates the fiber’s end face processing, or grinding method.
(2) Distinguishing by Color
- SC and LC Adapters: UPC versions are identified by blue, and APC by green, which are the inherent colors of the product itself.
- FC Adapters: UPC is indicated by red, and APC by green, reflecting the colors of the product’s dust caps.
- ST Adapters: UPC is marked by yellow, which is the color of the product’s dust cap.
Optical fiber adapters are the silent sentinels of our data-driven world, ensuring that the pathways of light are clear and efficient. By understanding the nuances of connector types and the language of colors, one can navigate the vast array of adapters with ease, selecting the perfect fit for any connectivity need.
