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The Story Of Legacy Fiber Optic Connectors

:: Choices of connectors

Over the years, a large variety of fiber optic connectors have been designed for most fiber optic installations. Lightwave equipment manufacturers have never standardized on any one connector type, they actually provide a selection of connectors for their equipment interface.

It is very important to choose the fiber connector type for your applications. You should maintain a connector standard throughout a fiber optic project.

:: The components of a fiber connector

For most fiber optic connectors, the major components are ferrule, connector body, connector cap and strain-relief boot.

Ferrule

The ferrule is the center part of the connector. It contains the optical fiber in a center hole. Ferrule can be made from ceramic (Zirconia), stainless steel or composite material.

Ceramic ferrule is the most popular material since it has stable temperature characteristics. The most common ceramic is Zirconia which is a white hard ceramic material. Ceramic ferrule is used for both single mode and multimode connectors. It offers the lowest insertion loss and the best repeatability.

Connector Body

Fiber optic connector body can be steel or plastic. The body design differs from connector to connector. The connector body provides the mechanism to hold the ferrule and other parts together. It also provides the locking mechanism for connector mating. The most common locking mechanisms are push-pull, snap-in, thread on and twist-on.

Connector Cap

Connector cap often has the same material as the body: either steel or plastic. The cap can be screw on, twist lock or snap-on for connector mating.

Strain-relief Boot

Strain-relief boot is the part connecting the connector body and the fiber cable. It is often made from rubber. Although it looks minimal, it is actually one of the most critical parts in a connector. It provides strain relief on the optical fiber to prevent micro-bending, breakage and provides mechanical support for fiber and connector handling.

:: Legacy Fiber Connector Types

The following list shows the legacy connector types that have been deployed in numerous fiber optic networks for many years.

ST Connector

ST connector was once the most popular fiber connector. It was well-liked for both single mode and multimode fiber connections. The average insertion loss for a ST connector is about 0.5dB.

ST connector has a twist-on locking mechanism which is not susceptible to loosening in vibrating environment. It is most often used in LAN networks.

FC Connector

FC connector is popular for single mode applications. It has the lowest insertion loss and the best repeatability. It has a thread-on locking mechanism.

SMA connector

SMA connector is a pretty old connector type which is mostly used for multimode applications. Today it is still being using on medical equipment.

There are two types of SMA connectors on the market: SMA 905 and SMA 906. The only difference between them is that SMA 906 has a straight ferrule while SMA 905 has a step-down ferrule.

D4 Connector

The NEC D4 was probably the first connector to use ceramic or hybrid ceramic/stainless steel ferrules. It uses a smaller ferrule than SCs or FCs. It was widely used in telco networks in the 80s to early 90s and some may still be in use.

FDDI connector

Besides the SC Duplex, you may occasionally see the FDDI duplex connectors which mate to their specific networks. They are generally used to connect to the equipment from a wall outlet, but the rest of the network will have ST or SC connectors. Since they both use 2.5 mm ferrules, they can be mated to SC or ST connectors with adapters.

Biconic Connector

Biconic connector's yellow body indicating a SM version - mutlimode versions were usually black. Biconic connector was developed by a team led by Jack Cook at Bell Labs in Murray Hill, NJ.

About the Author

Colin Yao is an expert on fiber optic networking technologies and products. Learn more about
bulk single mode fiber
,
corning fiber optic cable
,
outdoor single mode fiber
on Fiber Optics For Sale Co. web site.

How do I stop a connector changing colour when dragged from a homemade stencil 2 a homemade template in Visio?

I have created a stencil in Viso for standard use of symbols across our company and a standard template to ensure that each document has the same core pages. However, when I go to use one of my connector symbols, which are saved as being black in the stencil, they change colour to blue, in the template. I can't work out why. What makes it stranger, to me anyway, is that if I create a new basic diagram, i.e. not from my own template, the connector remains black. I guess it's something to do with the settings on the template but i don't know which setting, nor would I know how to change it if I found which setting it was.

Ive never come accross this problem in my copy of visio (Although i still have Visio where it wasn't microsoft) If your conecter is just a simple line then the property would be able to change in the document using the template. There should be a place to lock the propertys opf these objects but i dont know where in the recent versions of visio, you are going to have to do a bit of hunting.

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