However, in Patent Publication 4, only directions of 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 {HEAD ~ optical outputs} to {TAIL ~ the N output} waveguides or ports are equally distributed 
However , in Patent Publication 4 , only directions of 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 { HEAD ~ optical outputs } to { TAIL ~ the N output } waveguides or ports are equally distributed
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 OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH