intresting properties of directional coupler

[yefj]

Hello , I heard two facts about directional couplers:
1.if we take a directional coupler and send a signal from the output then the coupling port also will function as if if the input port
2. if we send a signal from coupling port the it will be coupled to the input port ?
are these facts correct?
I want to use the following component and I am not sure if those properties will exist in it?
Thanks.

https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/5864/FPC06882.pdf

 

[G4BCH]

Yes, you can use it as a signal injector.
https://blog.minicircuits.com/directional-couplers-their-operation-and-application/
https://urgentcomm.com/network-tech/using-directional-couplers

 

[D.A.(Tony)Stewart]

DC’s are bidirectional. Also if one splitter port is switched open the 3dB loss disappears.