What is the directional coupler

[ahmad_abdulghany]

Hello everybody,

I need any information about the optical directional coupler...

Please, help me out...

Thanks in advance,
Ahmad,

 

[IanP]

The simplest couplers are fiber optic splitters. These devices possess at least three ports but may have more than 32 for more complex devices. Figure 1 illustrates a simple 3-port device, also called a tee coupler. It can be thought of as a directional coupler directional coupler. One fiber is called the common fiber, while the other two fibers may be called input or output ports.
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Fiber optic couplers should prevent the transfer of optical power from one input fiber to another input fiber. Directional couplers are fiber optic couplers that prevent this transfer of power between input fibers ..

Quoted from:
http://www.fiber-optics.info/articles/couple-split.htm
http://www.tpub.com/neets/tm/108-11.htm

Regards,
IanP