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