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