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Fiber optic connectors for special applications

There are several special types of fiber optic connectors available, such as MTP multifiber connectors that are used in prefabricated cabling, for military connections, for underwater connections or for aircraft, plastic fiber optic (POF) connectors, etc. Most have been designed for specific applications and require rigorous certification tests. Some connectors, such as Mil-C-38999, are copper wire connectors adapted to hold fiber optic splints.  Many of these connectors require special cable types as well as special termination, cleaning, handling, and testing processes. Consult the manufacturer's instructions when handling this type of connector. 

Connector manufacturing
Most of the connectors available today use ceramic splints to hold and align the fibers. Ceramic is used because it adheres well to glass, is easy to polish and has low thermal expansion, such as fiberglass. The end of the ceramic splint sticks or crimps the connector body. The back of the connector has a suitable shape so that a compression sleeve can be introduced, which is used with simplex cables with cover to crimp aramid resistance elements to the connector body, which provides mechanical resistance to the termination. of the cable.  
Shapes and types of connector splint polishing

Fiber optic connectors can have different forms of splints or terminations, usually called termination or polishing types. The first connectors, which had no splints with splines and could rotate in the connection adapters, always had an air gap between the connectors to prevent them from rotating and causing scratches at the end of the fibers. The ends of the splints were polished on flat and resistant surfaces.
The first ST and FC connectors with splined splints were designed to fully join, what we now call 
"physical contact" (PC) type connectors. These first connectors still had the flat polished end. 
Reducing the air gap reduced the loss and reflection (which is very important for single-mode laser-
based systems) since it has a loss of about 5% (equivalent to 0.25 dB) in each air gap and the light returns reflected the fiber. While the air gap connectors normally had losses of 0.5 dB or more and 
a reflection of -20 dB, the PC connectors have fewer losses, of 0.3 dB and a lower reflection, of -30 
to -40 dB. PC connectors should be polished on a flat surface with a soft pad to allow convexly 

polishing.

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