There is provided a planar optical waveguide element in which an optical waveguide core comprises an inner side core having protruding portions that form a rib structure, and an outer side core that is provided on top of the inner side core and that covers circumferential surfaces of the protruding portions, wherein a refractive index of the outer side core is lower than an average refractive index of the inner side core. The structure of the planar optical waveguide element can be applied even when the core is formed from a material having a higher refractive index than that of a silica glass-based material such as silicon (Si) or silicon nitride (SixNy).
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机译:提供了一种平面光波导元件,其中,光波导芯包括:内侧芯,其具有形成肋状结构的突出部;以及外侧芯,其设置在内侧芯的顶部并且覆盖芯的周向表面。突出部分,其中外侧芯的折射率低于内侧芯的平均折射率。即使纤芯由折射率比硅玻璃(Si)或氮化硅(Si <x <)等石英玻璃系材料的折射率高的材料形成,也能够适用平面型光波导元件的结构。 / Sub> N y Sub>)。
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