OPTICAL WAVEGUIDE ELEMENT AND LIGHT MODULATION DEVICE AND LIGHT TRANSMITTER USING THE SAME

• Main Authors: MOTOYA MASAYUKI, KATAOKA TOSHIO
• Format: Patent
• Language: English; Japanese
• Published: 11.04.2023
• Subjects: DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF

To provide an optical waveguide element with which the dip phenomenon of frequency characteristics is suppressed and an increase in manufacturing cost is suppressed.SOLUTION: Provided is an optical waveguide element comprising a substrate 1 having electrooptical effects, an optical waveguide 2 formed on the substrate, and a control electrode for modulating the light wave propagating through the optical waveguide and located on the substrate 1. The control electrode includes a signal electrode S and a ground electrode, with the signal electrode S and the ground electrode arranged along a modulation effect portion of the optical waveguide that performs modulation, and the shape of the bottom of the ground electrode facing the substrate is such that a slit SL for separating the ground electrode into a first ground electrode G1 that is close to the signal electrode S and a second ground electrode G2 tat is far from the signal electrode S is formed in a range that corresponds to the modulation effect portion.SELECTED DRAWING: Figure 3 【課題】周波数特性のディップ現象を抑制し、しかも、製造コストの増加も抑えた光導波路素子を提供すること。【解決手段】電気光学効果を有する基板１と、該基板に形成された光導波路２と、該基板１上に配置され、該光導波路を伝搬する光波を変調するための制御電極を有する光導波路素子において、該制御電極は、信号電極Ｓと接地電極とを有し、該光導波路の変調を行う変調作用部分に沿って該信号電極Ｓと該接地電極が配置され、該接地電極の該基板に対向する底面の形状は、該接地電極を該信号電極Ｓに近い第１接地電極Ｇ１と該信号電極Ｓから遠い第２接地電極Ｇ２とに分離するスリットＳＬが、該変調作用部分に対応する範囲に形成されていることを特徴とする。【選択図】図３