The third optical waveguide is formed of a multi mode optical fiber and transmits {HEAD ~ the multi mode optical signal output} from {TAIL ~ the second optical waveguide} 
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The third optical waveguide is formed of a multi mode optical fiber and transmits { HEAD ~ the multi mode optical signal output } from { TAIL ~ the second optical waveguide }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL