| CPC G02F 1/2252 (2013.01) [G02B 6/125 (2013.01); G02B 6/2935 (2013.01); G02F 1/212 (2021.01)] | 8 Claims |
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1. An optical modulation element comprising:
two Mach-Zehnder type optical waveguides that are provided on a substrate;
a branched waveguide that branches input light which is input from an outside of the substrate into two light beams;
two connection waveguides that respectively guide the light beams branched by the branched waveguide to the two Mach-Zehnder type optical waveguides; and
electrodes that respectively control optical waves propagating in optical waveguides configuring the two Mach-Zehnder type optical waveguides, wherein
respective parallel waveguides of the two Mach-Zehnder type optical waveguides are configured to extend linearly along one side of the substrate,
the branched waveguide is a Y-branch optical waveguide disposed such that light is input from a direction of the one side of the substrate,
the branched waveguide is formed to be line-symmetrical with respect to a propagation direction of the light input to the branched waveguide and to output the two branched light beams in a direction different from the propagation direction,
the two connection waveguides each includes a linear waveguide and a curved waveguide, and
the linear waveguides each included in the connection waveguides extend in a direction different from the direction of extension of the parallel waveguides.
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