An object of the present invention is to provide a mode converter capable of uniformly coupling the power of a fundamental mode of a single mode optical waveguide to {HEAD ~ each mode} of {TAIL ~ a multi mode optical waveguide} 
An object of the present invention is to provide a mode converter capable of uniformly coupling the power of a fundamental mode of a single mode optical waveguide to { HEAD ~ each mode } of { TAIL ~ a multi mode optical waveguide }
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 TAIL TAIL