| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical waveguide element in which each optical waveguide has a plurality of optical waveguide parts arranged in parallel with each other, like a nest type optical waveguide, and crosstalk of modulation signals applied to respective optical waveguides can be effectively suppressed even in the case that the optical waveguide parts are closely arranged. <P>SOLUTION: The optical waveguide element includes a substrate 1 having an electro-optic effect, optical waveguides 2-3 to 2-6 formed on the substrate, and modulation electrodes 3-1 to 3-2 for modulating light waves guided in the optical waveguides. Each optical waveguide has such a configuration that a plurality of optical waveguide parts are arranged in parallel with each other and an electric field from the modulation electrodes is applied to at least one optical waveguide part, and each optical waveguide part is a sub-Mach-Zehnder waveguide of a nest type optical waveguide. A distance between the optical waveguide parts is 300 μm or shorter, and grooves 10 are formed between the optical waveguide parts, and the grooves are formed between different sub-Mach-Zehnder waveguides. <P>COPYRIGHT: (C)2012,JPO&INPIT |
