However, in Patent Publication 4, {HEAD ~ only directions} of {TAIL ~ the three splitting waveguides} of the Y type waveguide element for connecting them to each other are described and there is no concrete description regarding a method of designing a Y type waveguide element so that optical outputs to the N output waveguides or ports are equally distributed 
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However , in Patent Publication 4 , { HEAD ~ only directions } of { TAIL ~ the three splitting waveguides } of the Y type waveguide element for connecting them to each other are described and there is no concrete description regarding a method of designing a Y type waveguide element so that optical outputs to the N output waveguides or ports are equally distributed
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH