Disclosed is an optical power splitter that maximizes uniformity of the
power split ratio, while minimizing the output differences between channels. The
optical power splitter includes a semiconductor substrate; a core layered on the
semiconductor substrate, functioning as a transmission medium for optical signals
composed of multi-channels according to a wavelength, wherein the core comprises
an input waveguide for receiving the optical signals and a plurality of output
waveguides for outputting respective portions of the optical signals whose powers
are split; a clad for encompassing the core; and a rectilinear assistant waveguide
coupled between the input waveguide and a plurality of output waveguides, having
a designated width and length to uniformize mode profiles of the multi-channels
that are manifested on the output side edge of the rectilinear assistant waveguide.
