Coupler Lan Adapter
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US $1.56
FC fiber optic connector is popular in test environments and mostly for single mode applications.
FC stands for "Fixed Connection". It was the earliest connector and is now available in FC PC, FC APC, FC SPC and FC UPC types. It was originally devised by NTT (Nippon Telegraph and Telephone) for telecommunication applications. Thus it is popular in Japan and Europe. In the US, MCI used it in its fiber optic telephone networks in 1980s.
FC connector has a threaded coupling mechanism with adjustable keying to achieve minimum insertion loss. You can adjust the key in some degree in order to lock it at the minimum loss position. Although this tuning is useful in some applications where minimum loss is required, it is not used in most applications because of the small gain of 0.1~0.2dB in insertion loss.
Even though both single mode and multimode type of FC connectors are available, it is mostly used for single mode applications.
FC connector offers very high precise positioning of the fiber cables that are being joined. Thus FC has set the standard for optical fiber connectors.
But because of its threaded locking mechanism, FC connector cannot be paired in duplex version. This makes it less popular in LAN and premise fiber networks. It is being replaced by SC and LC connectors.
The threaded locking mechanism is constructed with a nickel-plated metal housing and a ceramic 2.5mm ferrule. This structure gives it secure connection even in high-vibration environments. The disadvantage is that it cannot be quickly connected and disconnected as with SC or LC connectors.
FC APC connector has a 8° angled ferrule endface. The purpose of this angled endface is to minimize reflection from the connector mating surfaces. FC APC connector provides minimum back reflection which is required to be lower than -60dB in most cases.
Colin Yao is an expert on fiber optic communication technology and products. Learn more about FC fiber connectors, FC APC connector and optic connector FC on Fiber Optics For Sale Co. web site.
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