Regarding the present invention, a type of {TAIL ~ S bent line} is not limited to circular arcs although a way of arranging an optical waveguide for {HEAD ~ an optical splitter} of the present invention employing circular arcs will be explained below 
Regarding the present invention , a type of { TAIL ~ S bent line } is not limited to circular arcs although a way of arranging an optical waveguide for { HEAD ~ an optical splitter } of the present invention employing circular arcs will be explained below
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH