1) Telecommunications equipment 
A star coupler is a device that takes in an input signal and splits it into several output signals. In fiber optics, and especially in telecommunications, a star coupler is a passive optical device, used in network applications. An optical signal introduced into any input port is distributed to all output ports. Because of the way a passive star c...
an optical fibre coupler in which optical power may be either distributed from one or several input ports to a larger number of output ports or combined from several input ports to a smaller number of output ports
A coupler with more than three ports.